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Campbell SE, Bollen G, Brown BA, Dockery A, Ireland CM, Minamisono K, Puentes D, Rickey BJ, Ringle R, Yandow IT, Fossez K, Ortiz-Cortes A, Schwarz S, Sumithrarachchi CS, Villari ACC. Precision Mass Measurement of the Proton Dripline Halo Candidate ^{22}Al. Phys Rev Lett 2024; 132:152501. [PMID: 38683002 DOI: 10.1103/physrevlett.132.152501] [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: 12/27/2023] [Accepted: 03/12/2024] [Indexed: 05/01/2024]
Abstract
We report the first mass measurement of the proton-halo candidate ^{22}Al performed with the low energy beam ion trap facility's 9.4 T Penning trap mass spectrometer at facility for rare isotope beams. This measurement completes the mass information for the lightest remaining proton-dripline nucleus achievable with Penning traps. ^{22}Al has been the subject of recent interest regarding a possible halo structure from the observation of an exceptionally large isospin asymmetry [J. Lee et al., Large isospin asymmetry in Si22/O22 Mirror Gamow-Teller transitions reveals the halo structure of ^{22}Al, Phys. Rev. Lett. 125, 192503 (2020).PRLTAO0031-900710.1103/PhysRevLett.125.192503]. The measured mass excess value of ME=18 092.5(3) keV, corresponding to an exceptionally small proton separation energy of S_{p}=100.4(8) keV, is compatible with the suggested halo structure. Our result agrees well with predictions from sd-shell USD Hamiltonians. While USD Hamiltonians predict deformation in the ^{22}Al ground state with minimal 1s_{1/2} occupation in the proton shell, a particle-plus-rotor model in the continuum suggests that a proton halo could form at large quadrupole deformation. These results emphasize the need for a charge radius measurement to conclusively determine the halo nature.
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Affiliation(s)
- S E Campbell
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - G Bollen
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - B A Brown
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - A Dockery
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - C M Ireland
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - K Minamisono
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - D Puentes
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - B J Rickey
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - R Ringle
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - I T Yandow
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA and Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - K Fossez
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA and Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - A Ortiz-Cortes
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - S Schwarz
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | | | - A C C Villari
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
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Leistenschneider E, Dunling E, Bollen G, Brown BA, Dilling J, Hamaker A, Holt JD, Jacobs A, Kwiatkowski AA, Miyagi T, Porter WS, Puentes D, Redshaw M, Reiter MP, Ringle R, Sandler R, Sumithrarachchi CS, Valverde AA, Yandow IT. Precision Mass Measurements of Neutron-Rich Scandium Isotopes Refine the Evolution of N=32 and N=34 Shell Closures. Phys Rev Lett 2021; 126:042501. [PMID: 33576685 DOI: 10.1103/physrevlett.126.042501] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 09/28/2020] [Accepted: 12/14/2020] [Indexed: 06/12/2023]
Abstract
We report high-precision mass measurements of ^{50-55}Sc isotopes performed at the LEBIT facility at NSCL and at the TITAN facility at TRIUMF. Our results provide a substantial reduction of their uncertainties and indicate significant deviations, up to 0.7 MeV, from the previously recommended mass values for ^{53-55}Sc. The results of this work provide an important update to the description of emerging closed-shell phenomena at neutron numbers N=32 and N=34 above proton-magic Z=20. In particular, they finally enable a complete and precise characterization of the trends in ground state binding energies along the N=32 isotone, confirming that the empirical neutron shell gap energies peak at the doubly magic ^{52}Ca. Moreover, our data, combined with other recent measurements, do not support the existence of a closed neutron shell in ^{55}Sc at N=34. The results were compared to predictions from both ab initio and phenomenological nuclear theories, which all had success describing N=32 neutron shell gap energies but were highly disparate in the description of the N=34 isotone.
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Affiliation(s)
- E Leistenschneider
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - E Dunling
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics, University of York, York YO10 5DD, United Kingdom
| | - G Bollen
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- 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
| | - B A Brown
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- 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 Dilling
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - A Hamaker
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- 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 D Holt
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics, McGill University, 3600 Rue University, Montréal, Quebec H3A 2T8, Canada
| | - A Jacobs
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - A A Kwiatkowski
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8P 5C2, Canada
| | - T Miyagi
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - W S Porter
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - D Puentes
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- 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 Redshaw
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - M P Reiter
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- II. Physikalisches Institut, Justus-Liebig-Universität, 35392 Gießen, Germany
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - R Ringle
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R Sandler
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - C S Sumithrarachchi
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - A A Valverde
- Department of Physics & Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - I T Yandow
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- 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
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Valverde AA, Brodeur M, Bollen G, Eibach M, Gulyuz K, Hamaker A, Izzo C, Ong WJ, Puentes D, Redshaw M, Ringle R, Sandler R, Schwarz S, Sumithrarachchi CS, Surbrook J, Villari ACC, Yandow IT. Erratum: High-Precision Mass Measurement of ^{56}Cu and the Redirection of the rp-Process Flow [Phys. Rev. Lett. 120, 032701 (2018)]. Phys Rev Lett 2019; 123:239905. [PMID: 31868474 DOI: 10.1103/physrevlett.123.239905] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Indexed: 06/10/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.120.032701.
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Valverde AA, Brodeur M, Bollen G, Eibach M, Gulyuz K, Hamaker A, Izzo C, Ong WJ, Puentes D, Redshaw M, Ringle R, Sandler R, Schwarz S, Sumithrarachchi CS, Surbrook J, Villari ACC, Yandow IT. High-Precision Mass Measurement of ^{56}Cu and the Redirection of the rp-Process Flow. Phys Rev Lett 2018; 120:032701. [PMID: 29400535 DOI: 10.1103/physrevlett.120.032701] [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: 07/22/2017] [Revised: 10/02/2017] [Indexed: 06/07/2023]
Abstract
We report the mass measurement of ^{56}Cu, using the LEBIT 9.4 T Penning trap mass spectrometer at the National Superconducting Cyclotron Laboratory at Michigan State University. The mass of ^{56}Cu is critical for constraining the reaction rates of the ^{55}Ni(p,γ) ^{56}Cu(p,γ) ^{57}Zn(β^{+}) ^{57}Cu bypass around the ^{56}Ni waiting point. Previous recommended mass excess values have disagreed by several hundred keV. Our new value, ME=-38626.7(7.1) keV, is a factor of 30 more precise than the extrapolated value suggested in the 2012 atomic mass evaluation [Chin. Phys. C 36, 1603 (2012)CPCHCQ1674-113710.1088/1674-1137/36/12/003], and more than a factor of 12 more precise than values calculated using local mass extrapolations, while agreeing with the newest 2016 atomic mass evaluation value [Chin. Phys. C 41, 030003 (2017)CPCHCQ1674-113710.1088/1674-1137/41/3/030003]. The new experimental average, using our new mass and the value from AME2016, is used to calculate the astrophysical ^{55}Ni(p,γ) and ^{56}Cu(p,γ) forward and reverse rates and perform reaction network calculations of the rp process. These show that the rp-process flow redirects around the ^{56}Ni waiting point through the ^{55}Ni(p,γ) route, allowing it to proceed to higher masses more quickly and resulting in a reduction in ashes around this waiting point and an enhancement to higher-mass ashes.
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Affiliation(s)
- A A Valverde
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - M Brodeur
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, 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 Eibach
- Institut für Physik, Universität Greifswald, 17487 Greifswald, Germany
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - K Gulyuz
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - A Hamaker
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - C Izzo
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - W-J Ong
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - D Puentes
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, 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
- Science of Advanced Materials Program, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - R Ringle
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - R Sandler
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
- Science of Advanced Materials Program, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - S Schwarz
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - C S Sumithrarachchi
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - J Surbrook
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - A C C Villari
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - I T Yandow
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
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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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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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Brodeur M, Brunner T, Ettenauer S, Lapierre A, Ringle R, Brown BA, Lunney D, Dilling J. Elucidation of the anomalous A=9 isospin quartet behavior. Phys Rev Lett 2012; 108:212501. [PMID: 23003246 DOI: 10.1103/physrevlett.108.212501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Indexed: 06/01/2023]
Abstract
Recent high-precision mass measurements of 9Li and 9Be, performed with the TITAN Penning trap at the TRIUMF ISAC facility, are analyzed in light of state-of-the-art shell model calculations. We find an explanation for the anomalous isobaric mass multiplet equation behavior for the two A=9 quartets. The presence of a cubic d=6.3(17) keV term for the J(π)=3/2(-) quartet and the vanishing cubic term for the excited J(π)=1/2(-) multiplet depend upon the presence of a nearby T=1/2 state in 9B and 9Be that induces isospin mixing. This is contrary to previous hypotheses involving purely Coulomb and charge-dependent effects. T=1/2 states have been observed near the calculated energy, above the T=3/2 state. However, an experimental confirmation of their J(π) is needed.
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Affiliation(s)
- M Brodeur
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada.
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Brodeur M, Brunner T, Champagne C, Ettenauer S, Smith MJ, Lapierre A, Ringle R, Ryjkov VL, Bacca S, Delheij P, Drake GWF, Lunney D, Schwenk A, Dilling J. First direct mass measurement of the two-neutron halo nucleus 6He and improved mass for the four-neutron halo 8He. Phys Rev Lett 2012; 108:052504. [PMID: 22400930 DOI: 10.1103/physrevlett.108.052504] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Revised: 11/04/2011] [Indexed: 05/31/2023]
Abstract
The first direct mass measurement of {6}He has been performed with the TITAN Penning trap mass spectrometer at the ISAC facility. In addition, the mass of {8}He was determined with improved precision over our previous measurement. The obtained masses are m({6}He)=6.018 885 883(57) u and m({8}He)=8.033 934 44(11) u. The {6}He value shows a deviation from the literature of 4σ. With these new mass values and the previously measured atomic isotope shifts we obtain charge radii of 2.060(8) and 1.959(16) fm for {6}He and {8}He, respectively. We present a detailed comparison to nuclear theory for {6}He, including new hyperspherical harmonics results. A correlation plot of the point-proton radius with the two-neutron separation energy demonstrates clearly the importance of three-nucleon forces.
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Affiliation(s)
- M Brodeur
- TRIUMF, 4004 Wesbrook Mall, Vancouver BC, Canada V6T 2A3.
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9
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Simon MC, Bale JC, Chowdhury U, Eberhardt B, Ettenauer S, Gallant AT, Jang F, Lennarz A, Luichtl M, Ma T, Robertson D, Simon VV, Andreoiu C, Brodeur M, Brunner T, Chaudhuri A, Crespo López-Urrutia JR, Delheij P, Frekers D, Grossheim A, Gwinner G, Kwiatkowski AA, Lapierre A, Mané E, Pearson MR, Ringle R, Schultz BE, Dilling J. The on-line charge breeding program at TRIUMF's Ion Trap For Atomic and Nuclear Science for precision mass measurements. Rev Sci Instrum 2012; 83:02A912. [PMID: 22380253 DOI: 10.1063/1.3673505] [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] [Indexed: 05/31/2023]
Abstract
TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN) constitutes the only high precision mass measurement setup coupled to a rare isotope facility capable of increasing the charge state of short-lived nuclides prior to the actual mass determination in a Penning trap. Recent developments around TITAN's charge breeder, the electron beam ion trap, form the basis for several successful experiments on radioactive isotopes with half-lives as low as 65 ms and in charge states as high as 22+.
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Affiliation(s)
- M C Simon
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.
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Ettenauer S, Simon MC, Gallant AT, Brunner T, Chowdhury U, Simon VV, Brodeur M, Chaudhuri A, Mané E, Andreoiu C, Audi G, López-Urrutia JRC, Delheij P, Gwinner G, Lapierre A, Lunney D, Pearson MR, Ringle R, Ullrich J, Dilling J. First use of high charge states for mass measurements of short-lived nuclides in a Penning trap. Phys Rev Lett 2011; 107:272501. [PMID: 22243307 DOI: 10.1103/physrevlett.107.272501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2011] [Indexed: 05/31/2023]
Abstract
Penning trap mass measurements of short-lived nuclides have been performed for the first time with highly charged ions, using the TITAN facility at TRIUMF. Compared to singly charged ions, this provides an improvement in experimental precision that scales with the charge state q. Neutron-deficient Rb isotopes have been charge bred in an electron beam ion trap to q=8-12+ prior to injection into the Penning trap. In combination with the Ramsey excitation scheme, this unique setup creating low energy, highly charged ions at a radioactive beam facility opens the door to unrivaled precision with gains of 1-2 orders of magnitude. The method is particularly suited for short-lived nuclides such as the superallowed β emitter 74Rb (T(1/2)=65 ms). The determination of its atomic mass and an improved Q(EC) value are presented.
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Affiliation(s)
- S Ettenauer
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, Canada.
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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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Smith M, Brodeur M, Brunner T, Ettenauer S, Lapierre A, Ringle R, Ryjkov VL, Ames F, Bricault P, Drake GWF, Delheij P, Lunney D, Sarazin F, Dilling J. First Penning-trap mass measurement of the exotic halo nucleus 11Li. Phys Rev Lett 2008; 101:202501. [PMID: 19113333 DOI: 10.1103/physrevlett.101.202501] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2008] [Indexed: 05/27/2023]
Abstract
In this Letter, we report a new mass for 11Li using the trapping experiment TITAN at TRIUMF's ISAC facility. This is by far the shortest-lived nuclide, t_{1/2}=8.8 ms, for which a mass measurement has ever been performed with a Penning trap. Combined with our mass measurements of ;{8,9}Li we derive a new two-neutron separation energy of 369.15(65) keV: a factor of 7 more precise than the best previous value. This new value is a critical ingredient for the determination of the halo charge radius from isotope-shift measurements. We also report results from state-of-the-art atomic-physics calculations using the new mass and extract a new charge radius for 11Li. This result is a remarkable confluence of nuclear and atomic physics.
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Affiliation(s)
- M Smith
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada
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13
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Ryjkov VL, Brodeur M, Brunner T, Smith M, Ringle R, Lapierre A, Ames F, Bricault P, Dombsky M, Delheij P, Lunney D, Pearson MR, Dilling J. Direct mass measurement of the four-neutron halo nuclide 8He. Phys Rev Lett 2008; 101:012501. [PMID: 18764106 DOI: 10.1103/physrevlett.101.012501] [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: 02/20/2008] [Indexed: 05/26/2023]
Abstract
A high-precision Penning trap mass measurement of the exotic 8He nuclide (T(1/2)=119 ms) has been carried out resulting in a reduction of the uncertainty of the halo binding energy by over an order of magnitude. The new mass, determined with a relative uncertainty of 9.2 x 10(-8) (deltam=690 eV) is 13 keV less bound than the previously accepted value. The mass measurement is of great relevance for the recent charge-radius measurement of 8He [P. Mueller, Phys. Rev. Lett. 99, 252501 (2007).10.1103/PhysRevLett.99.252501]. The 8He mass is the first result from the newly-commissioned Penning trap: TITAN (TRIUMF's Ion Trap for Atomic and Nuclear science) at the ISAC (Isotope Separator and Accelerator) radioactive beam facility at TRIUMF.
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Affiliation(s)
- V L Ryjkov
- TRIUMF, 4004 Wesbrook Mall, Vancouver BC, Canada V6T 2A3
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14
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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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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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Guy JT, Bromberg PA, Metz EN, Ringle R, Balcerzak SP. Oxygen delivery following transfusion of stored blood. I. Normal rats. J Appl Physiol (1985) 1974; 37:60-3. [PMID: 4836568 DOI: 10.1152/jappl.1974.37.1.60] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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