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Tarasov OB, Gade A, Fukushima K, Hausmann M, Kwan E, Portillo M, Smith M, Ahn DS, Bazin D, Chyzh R, Giraud S, Haak K, Kubo T, Morrissey DJ, Ostroumov PN, Richardson I, Sherrill BM, Stolz A, Watters S, Weisshaar D, Zhang T. Observation of New Isotopes in the Fragmentation of ^{198}Pt at FRIB. Phys Rev Lett 2024; 132:072501. [PMID: 38427880 DOI: 10.1103/physrevlett.132.072501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 12/22/2023] [Indexed: 03/03/2024]
Abstract
Five previously unknown isotopes (^{182,183}Tm, ^{186,187}Yb, ^{190}Lu) were produced, separated, and identified for the first time at the Facility for Rare Isotope Beams (FRIB) using the Advanced Rare Isotope Separator (ARIS). The new isotopes were formed through the interaction of a ^{198}Pt beam with a carbon target at an energy of 186 MeV/u and with a primary beam power of 1.5 kW. Event-by-event particle identification of A, Z, and q for the reaction products was performed by combining measurements of the energy loss, time of flight, magnetic rigidity Bρ, and total kinetic energy. The ARIS separator has a novel two-stage design with high resolving power to strongly suppress contaminant beams. This successful new isotope search was performed less than one year after FRIB operations began and demonstrates the discovery potential of the facility which will ultimately provide 400 kW of primary beam power.
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Affiliation(s)
- O B Tarasov
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Gade
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Fukushima
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Hausmann
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - E Kwan
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Portillo
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Smith
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - D S Ahn
- Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon 34126, Republic of Korea
| | - D Bazin
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - R Chyzh
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Giraud
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Haak
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - T Kubo
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D J Morrissey
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - P N Ostroumov
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - I Richardson
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - B M Sherrill
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Stolz
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Watters
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Weisshaar
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - T Zhang
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
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2
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Ahn DS, Amano J, Baba H, Fukuda N, Geissel H, Inabe N, Ishikawa S, Iwasa N, Komatsubara T, Kubo T, Kusaka K, Morrissey DJ, Nakamura T, Ohtake M, Otsu H, Sakakibara T, Sato H, Sherrill BM, Shimizu Y, Sumikama T, Suzuki H, Takeda H, Tarasov OB, Ueno H, Yanagisawa Y, Yoshida K. Discovery of ^{39}Na. Phys Rev Lett 2022; 129:212502. [PMID: 36461972 DOI: 10.1103/physrevlett.129.212502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 09/08/2022] [Accepted: 09/14/2022] [Indexed: 06/17/2023]
Abstract
The new isotope ^{39}Na, the most neutron-rich sodium nucleus observed so far, was discovered at the RIKEN Nishina Center Radioactive Isotope Beam Factory using the projectile fragmentation of an intense ^{48}Ca beam at 345 MeV/nucleon on a beryllium target. Projectile fragments were separated and identified in flight with the large-acceptance two-stage separator BigRIPS. Nine ^{39}Na events have been unambiguously observed in this work and clearly establish the particle stability of ^{39}Na. Furthermore, the lack of observation of ^{35,36}Ne isotopes in this experiment significantly improves the overall confidence that ^{34}Ne is the neutron dripline nucleus of neon. These results provide new key information to understand nuclear binding and nuclear structure under extremely neutron-rich conditions. The newly established stability of ^{39}Na has a significant impact on nuclear models and theories predicting the neutron dripline and also provides a key to understanding the nuclear shell property of ^{39}Na at the neutron number N=28, which is normally a magic number.
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Affiliation(s)
- D S Ahn
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - J Amano
- Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
| | - H Baba
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Fukuda
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Geissel
- GSI, Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - N Inabe
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Ishikawa
- Department of Physics, Tohoku University, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - N Iwasa
- Department of Physics, Tohoku University, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - T Komatsubara
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kubo
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Kusaka
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - T Nakamura
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
| | - M Ohtake
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Otsu
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Sakakibara
- Department of Physics, Tohoku University, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - H Sato
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - B M Sherrill
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - Y Shimizu
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Sumikama
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Suzuki
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - O B Tarasov
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - H Ueno
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yoshida
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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3
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Ahn DS, Fukuda N, Geissel H, Inabe N, Iwasa N, Kubo T, Kusaka K, Morrissey DJ, Murai D, Nakamura T, Ohtake M, Otsu H, Sato H, Sherrill BM, Shimizu Y, Suzuki H, Takeda H, Tarasov OB, Ueno H, Yanagisawa Y, Yoshida K. Location of the Neutron Dripline at Fluorine and Neon. Phys Rev Lett 2019; 123:212501. [PMID: 31809143 DOI: 10.1103/physrevlett.123.212501] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Indexed: 06/10/2023]
Abstract
A search for the heaviest isotopes of fluorine, neon, and sodium was conducted by fragmentation of an intense ^{48}Ca beam at 345 MeV/nucleon with a 20-mm-thick beryllium target and identification of isotopes in the large-acceptance separator BigRIPS at the RIKEN Radioactive Isotope Beam Factory. No events were observed for ^{32,33}F, ^{35,36}Ne, and ^{38}Na and only one event for ^{39}Na after extensive running. Comparison with predicted yields excludes the existence of bound states of these unobserved isotopes with high confidence levels. The present work indicates that ^{31}F and ^{34}Ne are the heaviest bound isotopes of fluorine and neon, respectively. The neutron dripline has thus been experimentally confirmed up to neon for the first time since ^{24}O was confirmed to be the dripline nucleus nearly 20 years ago. These data provide new keys to understanding the nuclear stability at extremely neutron-rich conditions.
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Affiliation(s)
- D S Ahn
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Fukuda
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Geissel
- GSI, Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - N Inabe
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Iwasa
- Department of Physics, Tohoku University, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - T Kubo
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Kusaka
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - D Murai
- Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
| | - T Nakamura
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
| | - M Ohtake
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Otsu
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Sato
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - B M Sherrill
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - Y Shimizu
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Suzuki
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - O B Tarasov
- National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
| | - H Ueno
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yoshida
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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4
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Tarasov OB, Ahn DS, Bazin D, Fukuda N, Gade A, Hausmann M, Inabe N, Ishikawa S, Iwasa N, Kawata K, Komatsubara T, Kubo T, Kusaka K, Morrissey DJ, Ohtake M, Otsu H, Portillo M, Sakakibara T, Sakurai H, Sato H, Sherrill BM, Shimizu Y, Stolz A, Sumikama T, Suzuki H, Takeda H, Thoennessen M, Ueno H, Yanagisawa Y, Yoshida K. Discovery of ^{60}Ca and Implications For the Stability of ^{70}Ca. Phys Rev Lett 2018; 121:022501. [PMID: 30085743 DOI: 10.1103/physrevlett.121.022501] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 06/11/2018] [Indexed: 06/08/2023]
Abstract
The discovery of the important neutron-rich nucleus _{20}^{60}Ca_{40} and seven others near the limits of nuclear stability is reported from the fragmentation of a 345 MeV/u ^{70}Zn projectile beam on ^{9}Be targets at the radioactive ion-beam factory of the RIKEN Nishina Center. The produced fragments were analyzed and unambiguously identified using the BigRIPS two-stage in-flight separator. The eight new neutron-rich nuclei discovered, ^{47}P, ^{49}S, ^{52}Cl, ^{54}Ar, ^{57}K, ^{59,60}Ca, and ^{62}Sc, are the most neutron-rich isotopes of the respective elements. In addition, one event consistent with ^{59}K was registered. The results are compared with the drip lines predicted by a variety of mass models and it is found that the models in best agreement with the observed limits of existence in the explored region tend to predict the even-mass Ca isotopes to be bound out to at least ^{70}Ca.
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Affiliation(s)
- O B Tarasov
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Moscow Region, Russian Federation
| | - D S Ahn
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D Bazin
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - N Fukuda
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Gade
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Hausmann
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - N Inabe
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S Ishikawa
- Department of Physics, Tohoku University, 6-3 Aramaki-aza-aoba, Aoba, Sendai 980-8578, Japan
| | - N Iwasa
- Department of Physics, Tohoku University, 6-3 Aramaki-aza-aoba, Aoba, Sendai 980-8578, Japan
| | - K Kawata
- Center for Nuclear Study, University of Tokyo, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Komatsubara
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Kubo
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Kusaka
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Ohtake
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Otsu
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Portillo
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - T Sakakibara
- Department of Physics, Tohoku University, 6-3 Aramaki-aza-aoba, Aoba, Sendai 980-8578, Japan
| | - H Sakurai
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Sato
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - B M Sherrill
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - Y Shimizu
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Stolz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - T Sumikama
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Suzuki
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - M Thoennessen
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - H Ueno
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Yanagisawa
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Yoshida
- RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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5
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Gulyuz K, Bollen G, Brodeur M, Bryce RA, Cooper K, Eibach M, Izzo C, Kwan E, Manukyan K, Morrissey DJ, Naviliat-Cuncic O, Redshaw M, Ringle R, Sandler R, Schwarz S, Sumithrarachchi CS, Valverde AA, Villari ACC. High Precision Determination of the β Decay Q(EC) Value of (11)C and Implications on the Tests of the Standard Model. Phys Rev Lett 2016; 116:012501. [PMID: 26799013 DOI: 10.1103/physrevlett.116.012501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Indexed: 06/05/2023]
Abstract
We report the determination of the Q(EC) value of the mirror transition of (11)C by measuring the atomic masses of (11)C and (11)B using Penning trap mass spectrometry. More than an order of magnitude improvement in precision is achieved as compared to the 2012 Atomic Mass Evaluation (Ame2012) [Chin. Phys. C 36, 1603 (2012)]. This leads to a factor of 3 improvement in the calculated Ft value. Using the new value, Q(EC)=1981.690(61) keV, the uncertainty on Ft is no longer dominated by the uncertainty on the Q(EC) value. Based on this measurement, we provide an updated estimate of the Gamow-Teller to Fermi mixing ratio and standard model values of the correlation coefficients.
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Affiliation(s)
- K Gulyuz
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - G Bollen
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - M Brodeur
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - R A Bryce
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - K Cooper
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Eibach
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - C Izzo
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - E Kwan
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - K Manukyan
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - O Naviliat-Cuncic
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Redshaw
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - R Ringle
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - R Sandler
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Schwarz
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - C S Sumithrarachchi
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - A A Valverde
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - A C C Villari
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
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6
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Meisel Z, George S, Ahn S, Bazin D, Brown BA, Browne J, Carpino JF, Chung H, Cole AL, Cyburt RH, Estradé A, Famiano M, Gade A, Langer C, Matoš M, Mittig W, Montes F, Morrissey DJ, Pereira J, Schatz H, Schatz J, Scott M, Shapira D, Smith K, Stevens J, Tan W, Tarasov O, Towers S, Wimmer K, Winkelbauer JR, Yurkon J, Zegers RGT. Mass Measurement of 56Sc Reveals a Small A = 56 Odd-Even Mass Staggering, Implying a Cooler Accreted Neutron Star Crust. Phys Rev Lett 2015; 115:162501. [PMID: 26550869 DOI: 10.1103/physrevlett.115.162501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Indexed: 06/05/2023]
Abstract
We present the mass excesses of (52-57)Sc, obtained from recent time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory at Michigan State University. The masses of 56Sc and 57Sc were determined for the first time with atomic mass excesses of -24.85(59)((-54)(+0)) MeV and -21.0(1.3) MeV, respectively, where the asymmetric uncertainty for 56Sc was included due to possible contamination from a long-lived isomer. The 56Sc mass indicates a small odd-even mass staggering in the A = 56 mass chain towards the neutron drip line, significantly deviating from trends predicted by the global FRDM mass model and favoring trends predicted by the UNEDF0 and UNEDF1 density functional calculations. Together with new shell-model calculations of the electron-capture strength function of 56Sc, our results strongly reduce uncertainties in model calculations of the heating and cooling at the 56Ti electron-capture layer in the outer crust of accreting neutron stars. We find that, in contrast to previous studies, neither strong neutrino cooling nor strong heating occurs in this layer. We conclude that Urca cooling in the outer crusts of accreting neutron stars that exhibit superbursts or high temperature steady-state burning, which are predicted to be rich in A≈56 nuclei, is considerably weaker than predicted. Urca cooling must instead be dominated by electron capture on the small amounts of adjacent odd-A nuclei contained in the superburst and high temperature steady-state burning ashes. This may explain the absence of strong crust Urca cooling inferred from the observed cooling light curve of the transiently accreting x-ray source MAXI J0556-332.
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Affiliation(s)
- Z Meisel
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - S George
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
- Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - S Ahn
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Bazin
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - B A Brown
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Browne
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - J F Carpino
- Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA
| | - H Chung
- Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA
| | - A L Cole
- Physics Department, Kalamazoo College, Kalamazoo, Michigan 49006, USA
| | - R H Cyburt
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Estradé
- School of Physics and Astronomy, The University of Edinburgh, EH8 9YL Edinburgh, United Kingdom
| | - M Famiano
- Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA
| | - A Gade
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Langer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Matoš
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - W Mittig
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - F Montes
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Pereira
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - H Schatz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Schatz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Scott
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Shapira
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - K Smith
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - J Stevens
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - W Tan
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - O Tarasov
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Towers
- Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA
| | - K Wimmer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - J R Winkelbauer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Yurkon
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R G T Zegers
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
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7
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Meisel Z, George S, Ahn S, Browne J, Bazin D, Brown BA, Carpino JF, Chung H, Cyburt RH, Estradé A, Famiano M, Gade A, Langer C, Matoš M, Mittig W, Montes F, Morrissey DJ, Pereira J, Schatz H, Schatz J, Scott M, Shapira D, Smith K, Stevens J, Tan W, Tarasov O, Towers S, Wimmer K, Winkelbauer JR, Yurkon J, Zegers RGT. Mass measurements demonstrate a strong N=28 shell gap in argon. Phys Rev Lett 2015; 114:022501. [PMID: 25635542 DOI: 10.1103/physrevlett.114.022501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Indexed: 06/04/2023]
Abstract
We present results from recent time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory at Michigan State University. We report the first mass measurements of ^{48}Ar and ^{49}Ar and find atomic mass excesses of -22.28(31) MeV and -17.8(1.1) MeV, respectively. These masses provide strong evidence for the closed shell nature of neutron number N=28 in argon, which is therefore the lowest even-Z element exhibiting the N=28 closed shell. The resulting trend in binding-energy differences, which probes the strength of the N=28 shell, compares favorably with shell-model calculations in the sd-pf shell using SDPF-U and SDPF-MU Hamiltonians.
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Affiliation(s)
- Z Meisel
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - S George
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA and Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
| | - S Ahn
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - J Browne
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - D Bazin
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA
| | - B A Brown
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA
| | - J F Carpino
- Department of Physics, Western Michigan University, Kalamazoo, 49008 Michigan, USA
| | - H Chung
- Department of Physics, Western Michigan University, Kalamazoo, 49008 Michigan, USA
| | - R H Cyburt
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - A Estradé
- School of Physics and Astronomy, The University of Edinburgh, EH8 9YL Edinburgh, United Kingdom
| | - M Famiano
- Department of Physics, Western Michigan University, Kalamazoo, 49008 Michigan, USA
| | - A Gade
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA
| | - C Langer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - M Matoš
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, 70803 Louisiana, USA
| | - W Mittig
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA
| | - F Montes
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Chemistry, Michigan State University, East Lansing, 48824 Michigan, USA
| | - J Pereira
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - H Schatz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - J Schatz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA
| | - M Scott
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA
| | - D Shapira
- Oak Ridge National Laboratory, Oak Ridge, 37831 Tennessee, USA
| | - K Smith
- Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA and Department of Physics, University of Notre Dame, South Bend, 46556 Indiana, USA
| | - J Stevens
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
| | - W Tan
- Department of Physics, University of Notre Dame, South Bend, 46556 Indiana, USA
| | - O Tarasov
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA
| | - S Towers
- Department of Physics, Western Michigan University, Kalamazoo, 49008 Michigan, USA
| | - K Wimmer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA
| | - J R Winkelbauer
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA
| | - J Yurkon
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA
| | - R G T Zegers
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 Michigan, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, 48824 Michigan, USA
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8
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Spyrou A, Liddick SN, Larsen AC, Guttormsen M, Cooper K, Dombos AC, Morrissey DJ, Naqvi F, Perdikakis G, Quinn SJ, Renstrøm T, Rodriguez JA, Simon A, Sumithrarachchi CS, Zegers RGT. Novel technique for constraining r-process (n, γ) reaction rates. Phys Rev Lett 2014; 113:232502. [PMID: 25526121 DOI: 10.1103/physrevlett.113.232502] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Indexed: 06/04/2023]
Abstract
A novel technique has been developed, which will open exciting new opportunities for studying the very neutron-rich nuclei involved in the r process. As a proof of principle, the γ spectra from the β decay of ^{76}Ga have been measured with the SuN detector at the National Superconducting Cyclotron Laboratory. The nuclear level density and γ-ray strength function are extracted and used as input to Hauser-Feshbach calculations. The present technique is shown to strongly constrain the ^{75}Ge(n,γ)^{76}Ge cross section and reaction rate.
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Affiliation(s)
- A Spyrou
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - S N Liddick
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - A C Larsen
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
| | - M Guttormsen
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
| | - K Cooper
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - A C Dombos
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - F Naqvi
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - G Perdikakis
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA and Central Michigan University, Mount Pleasant, Michigan, 48859, USA
| | - S J Quinn
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - T Renstrøm
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
| | - J A Rodriguez
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Simon
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and The Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - C S Sumithrarachchi
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R G T Zegers
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
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9
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Rossi DM, Minamisono K, Barquest BR, Bollen G, Cooper K, Davis M, Hammerton K, Hughes M, Mantica PF, Morrissey DJ, Ringle R, Rodriguez JA, Ryder CA, Schwarz S, Strum R, Sumithrarachchi C, Tarazona D, Zhao S. A field programmable gate array-based time-resolved scaler for collinear laser spectroscopy with bunched radioactive potassium beams. Rev Sci Instrum 2014; 85:093503. [PMID: 25273722 DOI: 10.1063/1.4895461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A new data acquisition system including a Field Programmable Gate Array (FPGA) based time-resolved scaler was developed for laser-induced fluorescence and beam bunch coincidence measurements. The FPGA scaler was tested in a collinear laser-spectroscopy experiment on radioactive (37)K at the BEam COoler and LAser spectroscopy (BECOLA) facility at the National Superconducting Cyclotron Laboratory at Michigan State University. A 1.29 μs bunch width from the buncher and a bunch repetition rate of 2.5 Hz led to a background suppression factor of 3.1 × 10(5) in resonant photon detection measurements. The hyperfine structure of (37)K and its isotope shift relative to the stable (39)K were determined using 5 × 10(4) s(-1) (37)K ions injected into the BECOLA beam line. The obtained hyperfine coupling constants A((2)S(1/2)) = 120.3(1.4) MHz, A((2)P(1/2)) = 15.2(1.1) MHz, and A((2)P(3/2)) = 1.4(8) MHz, and the isotope shift δν(39, 37) = -264(3) MHz are consistent with the previously determined values, where available.
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Affiliation(s)
- D M Rossi
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Minamisono
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - B R Barquest
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - G Bollen
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Cooper
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Davis
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Hammerton
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Hughes
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - P F Mantica
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R Ringle
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - J A Rodriguez
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - C A Ryder
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Schwarz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R Strum
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Sumithrarachchi
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Tarazona
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Zhao
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
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Tarasov OB, Morrissey DJ, Amthor AM, Baumann T, Bazin D, Gade A, Ginter TN, Hausmann M, Inabe N, Kubo T, Nettleton A, Pereira J, Portillo M, Sherrill BM, Stolz A, Thoennessen M. Evidence for a change in the nuclear mass surface with the discovery of the most neutron-rich nuclei with 17<or=Z<or=25. Phys Rev Lett 2009; 102:142501. [PMID: 19392430 DOI: 10.1103/physrevlett.102.142501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2009] [Indexed: 05/27/2023]
Abstract
The results of measurements of the production of neutron-rich nuclei by the fragmentation of a 76Ge beam are presented. The cross sections were measured for a large range of nuclei including 15 new isotopes that are the most neutron-rich nuclides of the elements chlorine to manganese (50Cl, 53Ar, ;{55,56}K, ;{57,58}Ca, ;{59,60,61}Sc, ;{62,63}Ti, ;{65,66}V, 68Cr, 70Mn). The enhanced cross sections of several new nuclei relative to a simple thermal evaporation framework, previously shown to describe similar production cross sections, indicates that nuclei in the region around 62Ti might be more stable than predicted by current mass models and could be an indication of a new island of inversion similar to that centered on 31Na.
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Affiliation(s)
- O B Tarasov
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
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11
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Savory J, Schury P, Bachelet C, Block M, Bollen G, Facina M, Folden CM, Guénaut C, Kwan E, Kwiatkowski AA, Morrissey DJ, Pang GK, Prinke A, Ringle R, Schatz H, Schwarz S, Sumithrarachchi CS. rp process and masses of N approximately Z approximately 34 nuclides. Phys Rev Lett 2009; 102:132501. [PMID: 19392349 DOI: 10.1103/physrevlett.102.132501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Indexed: 05/27/2023]
Abstract
High-precision Penning-trap mass measurements of the N approximately Z approximately 34 nuclides 68Se, 70Se, (70m)Br, and 71Br were performed, reaching experimental uncertainties of 0.5-15 keV. The new and improved mass data together with theoretical Coulomb displacement energies were used as input for rp process network calculations. An increase in the effective lifetime of the waiting point nucleus 68Se was found, and more precise information was obtained on the luminosity during a type I x-ray burst along with the final elemental abundances after the burst.
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Affiliation(s)
- J Savory
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
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12
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Block M, Bachelet C, Bollen G, Facina M, Folden CM, Guénaut C, Kwiatkowski AA, Morrissey DJ, Pang GK, Prinke A, Ringle R, Savory J, Schury P, Schwarz S. Discovery of a nuclear isomer in 65Fe with penning trap mass spectrometry. Phys Rev Lett 2008; 100:132501. [PMID: 18517939 DOI: 10.1103/physrevlett.100.132501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2007] [Revised: 01/10/2008] [Indexed: 05/26/2023]
Abstract
A new long-lived isomeric state in (65)Fe has been discovered with Penning trap mass spectrometry and high-precision mass measurements of the neutron-rich isotopes (63-65)Fe and (64-66)Co have been performed with the Low-Energy Beam and Ion Trap Facility at the NSCL. For the new isomer in (65)Fe an excitation energy of 402(5) keV has been determined from the measured mass difference between the isomeric and ground states. The mass uncertainties of all isotopes have been reduced by a factor of 10-100 compared to previous results. In the case of (64)Co the previous mass value was found to deviate by about 5 standard deviations from the new measurement.
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Affiliation(s)
- M Block
- National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, East Lansing, Michigan, USA.
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13
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Baumann T, Amthor AM, Bazin D, Brown BA, III CMF, Gade A, Ginter TN, Hausmann M, Matoš M, Morrissey DJ, Portillo M, Schiller A, Sherrill BM, Stolz A, Tarasov OB, Thoennessen M. Discovery of 40Mg and 42Al suggests neutron drip-line slant towards heavier isotopes. Nature 2007; 449:1022-4. [DOI: 10.1038/nature06213] [Citation(s) in RCA: 145] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2007] [Accepted: 08/31/2007] [Indexed: 11/09/2022]
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14
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Kwan E, Morrissey DJ, Davies DA, Steiner M, Sumithrarachchi CS, Weissman L. Production Yields of Neutron-Rich Fluorine Isotopes. ACTA ACUST UNITED AC 2007. [DOI: 10.1063/1.2710582] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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15
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Bollen G, Davies D, Facina M, Huikari J, Kwan E, Lofy PA, Morrissey DJ, Prinke A, Ringle R, Savory J, Schury P, Schwarz S, Sumithrarachchi C, Sun T, Weissman L. Experiments with thermalized rare isotope beams from projectile fragmentation: a precision mass measurement of the superallowed beta emitter 38Ca. Phys Rev Lett 2006; 96:152501. [PMID: 16712152 DOI: 10.1103/physrevlett.96.152501] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2006] [Indexed: 05/09/2023]
Abstract
The mass of the short-lived radio nuclide 38Ca (T(1/2) = 440 ms) has been measured with the 9.4-T Penning trap mass spectrometer of the Low-Energy Beam and Ion Trap Facility. A mass uncertainty of deltam = 280 eV has been achieved, corresponding to deltam/m = 8 x 10(-9). The result makes 38Ca, a superallowed beta emitter, a new candidate to test the conserved-vector-current hypothesis. The experiment is also the first demonstration that short-lived radioactive isotopes produced by projectile fragmentation of relativistic heavy-ion beams can be slowed down and prepared such that precision experiments of this kind are possible.
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Affiliation(s)
- G Bollen
- National Superconducting Cyclotron Laboratory. Michigan State University, East Lansing, Michigan, USA.
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16
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Rikovska J, Giles T, Stone NJ, White G, Wohr A, Veskovic M, Towner IS, Mantica PF, Prisciandaro JI, Morrissey DJ, Fedoseyev VN, Mishin VI, Koster U, Walters WB. First On-line beta-NMR on oriented nuclei: magnetic dipole moments of the (nup(1/2))(-1) 1/2(-) ground state in 67Ni and (pip(3/2))(+1) 3/2(-) ground state in 69Cu. Phys Rev Lett 2000; 85:1392-1395. [PMID: 10970512 DOI: 10.1103/physrevlett.85.1392] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2000] [Indexed: 05/23/2023]
Abstract
The first fully on-line use of the angular distribution of beta emission in detection of NMR of nuclei oriented at low temperatures is reported. The magnetic moments of the single valence particle, intermediate mass, isotopes 67Ni(nup(-1)(1/2);1/2(-)) and 69Cu(pip(1)(3/2);3/2(-)) are measured to be +0.601(5) &mgr;(N) and +2.84(1) &mgr;(N), respectively, revealing only a small deviation from the neutron p(1/2) single-particle value in the former and a large deviation from the proton p(3/2) single-particle value in the latter. Quantitative interpretation is given in terms of core polarization and meson-exchange currents.
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Affiliation(s)
- J Rikovska
- Department of Physics, Oxford University, Parks Road, OX1 3PU Oxford, United Kingdom
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17
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Collon P, Cole D, Davids B, Fauerbachs M, Harkewicz R, Kutschera W, Morrissey DJ, Pardo RC, Paul M, Sherrill BM, Steiner M. Measurement of the Long-lived Radionuclide 81Kr in Pre-nuclear and Present-day Atmospheric Krypton. ACTA ACUST UNITED AC 1999. [DOI: 10.1524/ract.1999.85.12.13] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- P. Collon
- Vienna Environmental Research Accelerator, Institut für Radiumforschung und Kernphysik, Universität Wien, Währingerstr. 17, A-1090 Wien, Austria
| | - D. Cole
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - B. Davids
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - M. Fauerbachs
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R. Harkewicz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | | | - D. J. Morrissey
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R. C. Pardo
- Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - M. Paul
- Racah Institute for Physics, Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - B. M. Sherrill
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - M. Steiner
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
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18
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Kelley JH, Austin SM, Azhari A, Bazin D, Brown JA, Esbensen H, Fauerbach M, Hellström M, Hirzebruch SE, Kryger RA, Morrissey DJ, Pfaff R, Powell CF, Ramakrishnan E, Sherrill BM, Steiner M, Suomijärvi T, Thoennessen M. Study of the Breakup Reaction 8B-->7Be+p: Absorption Effects and E2 Strength. Phys Rev Lett 1996; 77:5020-5023. [PMID: 10062694 DOI: 10.1103/physrevlett.77.5020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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19
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Scheit H, Glasmacher T, Brown BA, Brown JA, Cottle PD, Hansen PG, Harkewicz R, Hellström M, Ibbotson RW, Jewell JK, Kemper KW, Morrissey DJ, Steiner M, Thirolf P, Thoennessen M. New Region of Deformation: The Neutron-Rich Sulfur Isotopes. Phys Rev Lett 1996; 77:3967-3970. [PMID: 10062354 DOI: 10.1103/physrevlett.77.3967] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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20
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Brown JA, Bazin D, Benenson W, Caggiano J, Fauerbach M, Hellström M, Kelley JH, Kryger RA, Pfaff R, Sherrill BM, Steiner M, Morrissey DJ, Powell CF. Measurement of the 1H(6He,6Li)n reaction in inverse kinematics. Phys Rev C Nucl Phys 1996; 54:R2105-R2108. [PMID: 9971638 DOI: 10.1103/physrevc.54.r2105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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21
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Ieki K, Galonsky A, Sackett D, Kruse JJ, Lynch WG, Morrissey DJ, Orr NA, Sherrill BM, Winger JA, Deák F, Horváth Á, Kiss Á, Seres Z, Kolata JJ, Warner RE, Humphrey DL. Is there a bound dineutron in 11Li? Phys Rev C Nucl Phys 1996; 54:1589-1591. [PMID: 9971504 DOI: 10.1103/physrevc.54.1589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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22
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Zahar M, Belbot M, Kolata JJ, Lamkin K, Morrissey DJ, Sherrill BM, Lewitowicz M, Wuosmaa AH, Al-Khalili JS, Tostevin JA, Thompson IJ. Quasielastic scattering of 9Li on 12C. Phys Rev C Nucl Phys 1996; 54:1262-1266. [PMID: 9971461 DOI: 10.1103/physrevc.54.1262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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23
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Pfaff R, Morrissey DJ, Benenson W, Fauerbach M, Hellström M, Powell CF, Sherrill BM, Steiner M, Winger JA. Fragmentation of 78Kr projectiles. Phys Rev C Nucl Phys 1996; 53:1753-1758. [PMID: 9971126 DOI: 10.1103/physrevc.53.1753] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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24
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Fauerbach M, Morrissey DJ, Benenson W, Brown BA, Hellström M, Kelley JH, Kryger RA, Pfaff R, Powell CF, Sherrill BM. New search for 26O. Phys Rev C Nucl Phys 1996; 53:647-651. [PMID: 9970982 DOI: 10.1103/physrevc.53.647] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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25
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Steiner M, Austin SM, Bazin D, Benenson W, Bertulani CA, Brown JA, Fauerbach M, Hellström M, Kashy E, Kelley JH, Kryger RA, Kubo T, Orr NA, Pfaff R, Sherrill BM, Thoennessen M, Yennello SJ, Young BM, Zecher PD, Morrissey DJ, Powell CF. First study of heavy-ion mirror charge exchange. Phys Rev Lett 1996; 76:26-29. [PMID: 10060425 DOI: 10.1103/physrevlett.76.26] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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26
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Hanold KA, Bazin D, Mohar MF, Moretto LG, Morrissey DJ, Orr NA, Sherrill BM, Winger JA, Wozniak GJ, Yennello SJ. Heavy residues from very mass-asymmetric heavy-ion reactions. Phys Rev C Nucl Phys 1995; 52:1462-1483. [PMID: 9970650 DOI: 10.1103/physrevc.52.1462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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27
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Orr NA, Anantaraman N, Austin SM, Bertulani CA, Hanold K, Kelley JH, Kryger RA, Morrissey DJ, Sherrill BM, Souliotis GA, Steiner M, Thoennessen M, Winfield JS, Winger JA, Young BM. Momentum distributions of 9Li fragments from the breakup of 11Li and the neutron halo. Phys Rev C Nucl Phys 1995; 51:3116-3126. [PMID: 9970413 DOI: 10.1103/physrevc.51.3116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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28
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Belbot MD, Kolata JJ, Lamkin K, Tighe RJ, Zahar M, Harkewicz R, Morrissey DJ, Orr NA, Ronningen RM, Sherrill BM, Winger JA, Carpenter M. beta -delayed neutron decay of 14Be. Phys Rev C Nucl Phys 1995; 51:2372-2380. [PMID: 9970318 DOI: 10.1103/physrevc.51.2372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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29
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Bazin D, Brown BA, Brown J, Fauerbach M, Hellström M, Hirzebruch SE, Kelley JH, Kryger RA, Morrissey DJ, Pfaff R, Powell CF, Sherrill BM, Thoennessen M. One-neutron halo of 19C. Phys Rev Lett 1995; 74:3569-3572. [PMID: 10058238 DOI: 10.1103/physrevlett.74.3569] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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30
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Pfaff R, Morrissey DJ, Fauerbach M, Hellström M, Kelley JH, Kryger RA, Sherrill BM, Steiner M, Winfield JS, Winger JA, Yennello SJ, Young BM. Projectilelike fragment momentum distributions from 86Kr+Al at 70 MeV/nucleon. Phys Rev C Nucl Phys 1995; 51:1348-1355. [PMID: 9970186 DOI: 10.1103/physrevc.51.1348] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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31
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Kelley JH, Austin SM, Kryger RA, Morrissey DJ, Orr NA, Sherrill BM, Thoennessen M, Winfield JS, Winger JA, Young BM. Parallel momentum distributions as a probe of halo wave functions. Phys Rev Lett 1995; 74:30-33. [PMID: 10057691 DOI: 10.1103/physrevlett.74.30] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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32
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Hencheck M, Boyd RN, Hellström M, Morrissey DJ, Balbes MJ, Chloupek FR, Fauerbach M, Mitchell CA, Pfaff R, Powell CF, Raimann G, Sherrill BM, Steiner M, Vandegriff J, Yennello SJ. Identification of new nuclei near the proton drip line. Phys Rev C Nucl Phys 1994; 50:2219-2221. [PMID: 9969900 DOI: 10.1103/physrevc.50.2219] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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33
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Souliotis GA, Harkewicz R, McDonald KN, Morrissey DJ, Chen Y, Kashy E, Sherrill BM, Orr NA, Winger JA. Differential cross sections of projectilelike fragments from 18O and 40Ar at E/A=80 MeV. Phys Rev C Nucl Phys 1994; 49:3301-3304. [PMID: 9969611 DOI: 10.1103/physrevc.49.3301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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34
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Balamuth DP, Griffioen KA, Bush JE, Pohl KR, Handzy DO, Aguirre A, Sherrill BM, Winfield JS, Morrissey DJ, Thoennessen M. Importance of nuclear effects in the dissociation of 6He and 6Li at E/A=65 MeV. Phys Rev Lett 1994; 72:2355-2358. [PMID: 10055859 DOI: 10.1103/physrevlett.72.2355] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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35
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Zahar M, Belbot M, Kolata JJ, Lamkin K, Thompson R, Kelley JH, Kryger RA, Morrissey DJ, Orr NA, Sherrill BM, Winfield JS, Winger JA, Wuosmaa AH. Quasielastic scattering of 12,14Be on 12C. Phys Rev C Nucl Phys 1994; 49:1540-1544. [PMID: 9969376 DOI: 10.1103/physrevc.49.1540] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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36
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Scheller KW, Görres J, Ross JG, Wiescher M, Harkewicz R, Morrissey DJ, Sherrill BM, Steiner M, Orr NA, Winger JA. Study of the beta -delayed neutron decay of 18N. Phys Rev C Nucl Phys 1994; 49:46-50. [PMID: 9969199 DOI: 10.1103/physrevc.49.46] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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37
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Winger JA, Bazin DP, Benenson W, Crawley GM, Morrissey DJ, Orr NA, Pfaff R, Sherrill BM, Thoennessen M, Yennello SJ, Young BM. Half-life measurements for 61Ga, 63Ge, and 65As and their importance in the rp process. Phys Rev C Nucl Phys 1993; 48:3097-3105. [PMID: 9969184 DOI: 10.1103/physrevc.48.3097] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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38
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Zahar M, Belbot M, Kolata JJ, Lamkin K, Thompson R, Orr NA, Kelley JH, Kryger RA, Morrissey DJ, Sherrill BM, Winger JA, Winfield JS, Wuosmaa AH. Momentum distributions for 12,14Be fragmentation. Phys Rev C Nucl Phys 1993; 48:R1484-R1487. [PMID: 9969066 DOI: 10.1103/physrevc.48.r1484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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39
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Hanold K, Moretto LG, Peaslee GF, Wozniak GJ, Bowman DR, Mohar MF, Morrissey DJ. Transition from complete to incomplete fusion in asymmetric heavy ion reactions. Phys Rev C Nucl Phys 1993; 48:723-734. [PMID: 9968883 DOI: 10.1103/physrevc.48.723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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40
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Sackett D, Ieki K, Galonsky A, Bertulani CA, Esbensen H, Kruse JJ, Lynch WG, Morrissey DJ, Orr NA, Sherrill BM, Schulz H, Sustich A, Winger JA, Deák F, Horváth Á, Kiss Á, Seres Z, Kolata JJ, Warner RE, Humphrey DL. Electromagnetic excitation of 11Li. Phys Rev C Nucl Phys 1993; 48:118-135. [PMID: 9968801 DOI: 10.1103/physrevc.48.118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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41
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Chen Y, Kashy E, Bazin D, Benenson W, Morrissey DJ, Orr NA, Sherrill BM, Winger JA, Young B, Yurkon J. Half-life of 32Si. Phys Rev C Nucl Phys 1993; 47:1462-1465. [PMID: 9968590 DOI: 10.1103/physrevc.47.1462] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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42
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Ieki K, Sackett D, Galonsky A, Bertulani CA, Kruse JJ, Lynch WG, Morrissey DJ, Orr NA, Schulz H, Sherrill BM, Sustich A, Winger JA, Deák F, Horváth Á, Kiss Á, Seres Z, Kolata JJ, Warner RE, Humphrey DL. Coulomb dissociation of 11Li. Phys Rev Lett 1993; 70:730-733. [PMID: 10054189 DOI: 10.1103/physrevlett.70.730] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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43
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Morrissey DJ. Comment on "Fragmentation of gold projectiles with energies of 200-980 MeV/nucleon. I. Experimental method, charge yields, and transverse momenta". Phys Rev C Nucl Phys 1993; 47:413-414. [PMID: 9968454 DOI: 10.1103/physrevc.47.413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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44
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Yennello SJ, Winger JA, Antaya T, Benenson W, Mohar MF, Morrissey DJ, Orr NA, Sherrill BM. New nuclei near the proton drip line around Z=40. Phys Rev C Nucl Phys 1992; 46:2620-2623. [PMID: 9968392 DOI: 10.1103/physrevc.46.2620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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45
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Orr NA, Anantaraman N, Austin SM, Bertulani CA, Hanold K, Kelley JH, Morrissey DJ, Sherrill BM, Souliotis GA, Thoennessen M, Winfield JS, Winger JA. Momentum distributions of 9Li fragments following the breakup of 11Li. Phys Rev Lett 1992; 69:2050-2053. [PMID: 10046386 DOI: 10.1103/physrevlett.69.2050] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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46
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Souliotis GA, Morrissey DJ, Orr NA, Sherrill BM, Winger JA. 0 degrees measurements of momentum distributions of projectile-like fragments. Phys Rev C Nucl Phys 1992; 46:1383-1392. [PMID: 9968245 DOI: 10.1103/physrevc.46.1383] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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47
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Görres J, Wiescher M, Scheller K, Morrissey DJ, Sherrill BM, Bazin D, Winger JA. beta -delayed proton decay of 20Mg and its astrophysical implications. Phys Rev C Nucl Phys 1992; 46:R833-R837. [PMID: 9968224 DOI: 10.1103/physrevc.46.r833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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48
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Yokoyama A, Loveland W, Liljenzin JO, Aleklett K, Morrissey DJ, Seaborg GT. Fragmentation of 197Au by 21 MeV/nucleon 129Xe. Phys Rev C Nucl Phys 1992; 46:647-654. [PMID: 9968161 DOI: 10.1103/physrevc.46.647] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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49
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Harkewicz R, Morrissey DJ, Brown BA, Nolen JA, Orr NA, Sherrill BM, Winfield JS, Winger JA. beta -decay branching ratios of the neutron-rich nucleus 15B. Phys Rev C Nucl Phys 1991; 44:2365-2371. [PMID: 9967666 DOI: 10.1103/physrevc.44.2365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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50
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Mohar MF, Bazin D, Benenson W, Morrissey DJ, Orr NA, Sherrill BM, Swan D, Winger JA, Mueller AC, Guillemaud-Mueller D. Identification of new nuclei near the proton-drip line for 31 <= Z <= 38. Phys Rev Lett 1991; 66:1571-1574. [PMID: 10043244 DOI: 10.1103/physrevlett.66.1571] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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