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Cavallaro M, De Napoli M, Cappuzzello F, Orrigo SEA, Agodi C, Bondí M, Carbone D, Cunsolo A, Davids B, Davinson T, Foti A, Galinski N, Kanungo R, Lenske H, Ruiz C, Sanetullaev A. Investigation of the ^{10}Li shell inversion by neutron continuum transfer reaction. Phys Rev Lett 2017; 118:012701. [PMID: 28106447 DOI: 10.1103/physrevlett.118.012701] [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: 01/26/2016] [Indexed: 06/06/2023]
Abstract
This Letter reports a study of the highly debated ^{10}Li structure through the d(^{9}Li,p)^{10}Li one-neutron transfer reaction at 100 MeV. The ^{10}Li energy spectrum is measured up to 4.6 MeV and angular distributions corresponding to different excitation energy regions are reported for the first time. The comparison between data and theoretical predictions, including pairing correlation effects, shows the existence of a p_{1/2} resonance at 0.45±0.03 MeV excitation energy, while no evidence for a significant s-wave contribution close to the threshold energy is observed. Moreover, two high-lying structures are populated at 1.5 and 2.9 MeV. The corresponding angular distributions suggest a significant s_{1/2} partial-wave contribution for the 1.5 MeV structure and a mixing of configurations at higher energy, with the d_{5/2} partial-wave contributing the most to the cross section.
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Affiliation(s)
- M Cavallaro
- INFN-Laboratori Nazionali del Sud, I-95123 Catania, Italy
| | - M De Napoli
- INFN-Sezione di Catania, I-95123 Catania, Italy
| | - F Cappuzzello
- INFN-Laboratori Nazionali del Sud, I-95123 Catania, Italy
- Dipartimento di Fisica e Astronomia, Universitá di Catania, I-95123 Catania, Italy
| | - S E A Orrigo
- Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - C Agodi
- INFN-Laboratori Nazionali del Sud, I-95123 Catania, Italy
| | - M Bondí
- INFN-Sezione di Catania, I-95123 Catania, Italy
| | - D Carbone
- INFN-Laboratori Nazionali del Sud, I-95123 Catania, Italy
| | - A Cunsolo
- INFN-Laboratori Nazionali del Sud, I-95123 Catania, Italy
| | - B Davids
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - T Davinson
- School of Physics and Astronomy, University of Edinburgh, EH9 3FD Edinburgh, United Kingdom
| | - A Foti
- INFN-Sezione di Catania, I-95123 Catania, Italy
- Dipartimento di Fisica e Astronomia, Universitá di Catania, I-95123 Catania, Italy
| | - N Galinski
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - R Kanungo
- Astronomy and Physics Department, Saint Marys University, Halifax, Nova Scotia B3H 3C3, Canada
| | - H Lenske
- Institut für Theoretische Physik, Universität Giessen, D-35392 Giessen, Germany
| | - C Ruiz
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
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Tomlinson JR, Fallis J, Laird AM, Fox SP, Akers C, Alcorta M, Bentley MA, Christian G, Davids B, Davinson T, Fulton BR, Galinski N, Rojas A, Ruiz C, de Séréville N, Shen M, Shotter AC. Measurement of 23Na(α,p)26Mg at Energies Relevant to 26Al Production in Massive Stars. Phys Rev Lett 2015; 115:052702. [PMID: 26274415 DOI: 10.1103/physrevlett.115.052702] [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: 04/22/2015] [Indexed: 06/04/2023]
Abstract
26Al is an important radioisotope in astrophysics that provides evidence of ongoing nucleosynthesis in the Galaxy. The 23Na(α, p)26Mg reaction has been identified by a sensitivity study as being one of the most important reactions for the production of 26Al in the convective C/Ne burning shell of massive stars. Owing to large uncertainties in previous experimental data, model calculations are used for the reaction rate of 23Na(α, p)26Mg in this sensitivity study. Current experimental data suggest a reaction rate a factor of ∼40 higher than model calculations. However, a new measurement of this reaction cross section has been made in inverse kinematics in the energy range E(c.m.)=1.28-3.15 MeV at TRIUMF, and found to be in reasonable agreement with the model calculation. A new reaction rate is calculated and tight constraints on the uncertainty in the production of 26Al, due to this reaction, are determined.
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Affiliation(s)
- J R Tomlinson
- The University of York, Heslington, York YO10 5DD, United Kingdom
| | - J Fallis
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A M Laird
- The University of York, Heslington, York YO10 5DD, United Kingdom
| | - S P Fox
- The University of York, Heslington, York YO10 5DD, United Kingdom
| | - C Akers
- The University of York, Heslington, York YO10 5DD, United Kingdom
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - M Alcorta
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - M A Bentley
- The University of York, Heslington, York YO10 5DD, United Kingdom
| | - G Christian
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - B Davids
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - T Davinson
- School of Physics and Astronomy, The University of Edinburgh, James Clerk Maxwell Building, Mayfield Road, Edinburgh EH9 3FD, United Kingdom
| | - B R Fulton
- The University of York, Heslington, York YO10 5DD, United Kingdom
| | - N Galinski
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A Rojas
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - C Ruiz
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - N de Séréville
- Institut de Physique Nucléaire d'Orsay, IN2P3-CNRS and Univ Paris-Sud, F-91405 Orsay Cedex, France
| | - M Shen
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A C Shotter
- School of Physics and Astronomy, The University of Edinburgh, James Clerk Maxwell Building, Mayfield Road, Edinburgh EH9 3FD, United Kingdom
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Kanungo R, Sanetullaev A, Tanaka J, Ishimoto S, Hagen G, Myo T, Suzuki T, Andreoiu C, Bender P, Chen AA, Davids B, Fallis J, Fortin JP, Galinski N, Gallant AT, Garrett PE, Hackman G, Hadinia B, Jansen G, Keefe M, Krücken R, Lighthall J, McNeice E, Miller D, Otsuka T, Purcell J, Randhawa JS, Roger T, Rojas A, Savajols H, Shotter A, Tanihata I, Thompson IJ, Unsworth C, Voss P, Wang Z. Evidence of soft dipole resonance in ^{11}li with isoscalar character. Phys Rev Lett 2015; 114:192502. [PMID: 26024166 DOI: 10.1103/physrevlett.114.192502] [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: 12/24/2014] [Indexed: 06/04/2023]
Abstract
The first conclusive evidence of a dipole resonance in ^{11}Li having isoscalar character observed from inelastic scattering with a novel solid deuteron target is reported. The experiment was performed at the newly commissioned IRIS facility at TRIUMF. The results show a resonance peak at an excitation energy of 1.03±0.03 MeV with a width of 0.51±0.11 MeV (FWHM). The angular distribution is consistent with a dipole excitation in the distorted-wave Born approximation framework. The observed resonance energy together with shell model calculations show the first signature that the monopole tensor interaction is important in ^{11}Li. The first ab initio calculations in the coupled cluster framework are also presented.
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Affiliation(s)
- R Kanungo
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
| | - A Sanetullaev
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - J Tanaka
- RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan
| | - S Ishimoto
- High Energy Accelerator Research Organization (KEK), Ibaraki 305-0801, Japan
| | - G Hagen
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - T Myo
- General Education, Faculty of Engineering, Osaka Institute of Technology, Osaka, Osaka 535-8585, Japan
| | - T Suzuki
- Department of Physics, Nihon University, Setagaya-ku, Tokyo 156-8550, Japan
| | - C Andreoiu
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - P Bender
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - A A Chen
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - B Davids
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - J Fallis
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - J P Fortin
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
- Department of Physics, University of Laval, Quebec City, Quebec G1V 0A8, Canada
| | - N Galinski
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - A T Gallant
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - P E Garrett
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - G Hackman
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - B Hadinia
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - G Jansen
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M Keefe
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
| | - R Krücken
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - J Lighthall
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - E McNeice
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - D Miller
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - T Otsuka
- Department of Physics and Center of Nuclear Studies, University of Tokyo, Bunky-ku, Tokyo 113-0033, Japan
| | - J Purcell
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
| | - J S Randhawa
- Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
| | - T Roger
- Grand Accélérateur National dIons Lourds, CEA/DSM-CNRS/IN2P3, B.P. 55027, F-14076 Caen Cedex 5, France
| | - A Rojas
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - H Savajols
- Grand Accélérateur National dIons Lourds, CEA/DSM-CNRS/IN2P3, B.P. 55027, F-14076 Caen Cedex 5, France
| | - A Shotter
- School of Physics and Astronomy, University of Edinburgh, EH9 3JZ, Edinburgh, United Kingdom
| | - I Tanihata
- RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan
- School of Physics and Nuclear Energy Engineering and IRCNPC, Beihang University, Beijing 100191, China
| | - I J Thompson
- Lawrence Livermore National Laboratory, L-414, Livermore, California 94551, USA
| | - C Unsworth
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
| | - P Voss
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - Z Wang
- TRIUMF, Vancouver, British Columbia V6T2A3, Canada
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
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5
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Salter PJC, Aliotta M, Davinson T, Al Falou H, Chen A, Davids B, Fulton BR, Galinski N, Howell D, Lotay G, Machule P, Murphy AS, Ruiz C, Sjue S, Taggart M, Walden P, Woods PJ. Measurement of the 18Ne(α,p0) 21Na reaction cross section in the burning energy region for x-ray bursts. Phys Rev Lett 2012; 108:242701. [PMID: 23004266 DOI: 10.1103/physrevlett.108.242701] [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: 02/16/2012] [Indexed: 06/01/2023]
Abstract
The 18Ne(α,p) 21Na reaction provides one of the main HCNO-breakout routes into the rp process in x-ray bursts. The 18Ne(α,p0) 21Na reaction cross section has been determined for the first time in the Gamow energy region for peak temperatures T∼2 GK by measuring its time-reversal reaction 21Na(p,α) 18Ne in inverse kinematics. The astrophysical rate for ground-state to ground-state transitions was found to be a factor of 2 lower than Hauser-Feshbach theoretical predictions. Our reduced rate will affect the physical conditions under which breakout from the HCNO cycles occurs via the 18Ne(α,p) 21Na reaction.
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Affiliation(s)
- P J C Salter
- SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
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Tanihata I, Alcorta M, Bandyopadhyay D, Bieri R, Buchmann L, Davids B, Galinski N, Howell D, Mills W, Mythili S, Openshaw R, Padilla-Rodal E, Ruprecht G, Sheffer G, Shotter AC, Trinczek M, Walden P, Savajols H, Roger T, Caamano M, Mittig W, Roussel-Chomaz P, Kanungo R, Gallant A, Notani M, Savard G, Thompson IJ. Measurement of the two-halo neutron transfer reaction (1)H((11)Li, (9)Li)(3)H at 3A MeV. Phys Rev Lett 2008; 100:192502. [PMID: 18518445 DOI: 10.1103/physrevlett.100.192502] [Citation(s) in RCA: 5] [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: 01/22/2008] [Indexed: 05/26/2023]
Abstract
The p((11)Li, (9)Li)t reaction has been studied for the first time at an incident energy of 3A MeV at the new ISAC-2 facility at TRIUMF. An active target detector MAYA, built at GANIL, was used for the measurement. The differential cross sections have been determined for transitions to the (9)Li ground and first excited states in a wide range of scattering angles. Multistep transfer calculations using different (11)Li model wave functions show that wave functions with strong correlations between the halo neutrons are the most successful in reproducing the observation.
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