Gamow-Teller transitions to Zr-93 via the Nb-93(t, He-3 + gamma) reaction at 115 MeV/u and its application to the stellar electron-capture rates
文献类型：期刊论文
| 作者 | Gao, B.1,2,3,12 ; Zegers, R. G. T.1,2,4; Zamora, J. C.1,2,5; Bazin, D.1,4; Brown, B. A.1,2,4; Bender, P.6; Crawford, H. L.7; Engel, J.8; Falduto, A.2,9; Gade, A.1,2,4
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| 刊名 | PHYSICAL REVIEW C
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| 出版日期 | 2020-01-10 |
| 卷号 | 101期号:1页码:10 |
| ISSN号 | 2469-9985 |
| DOI | 10.1103/PhysRevC.101.014308 |
| 通讯作者 | Gao, B.(gaobsh@impcas.ac.cn) |
| 英文摘要 | Electron-capture reactions play important roles in the late evolution of core-collapse supernovae. The electroncapture rates used in astrophysical simulations rely on theoretical calculations which have to be tested against and guided by experimental data. We report on the measurement of the Gamow-Teller strength distribution of the odd-mass nucleus Nb-93 via the (t, He-3 gamma) charge-exchange reaction at a beam energy of 115 MeV/u. The Gamow-Teller strength distributions were extracted up to an excitation energy in Zr-93 of 10 MeV. The results were compared with shell-model and quasiparticle random-phase approximation (QRPA) calculations. The theoretical calculations fail to describe the details of the strength distribution, but estimate reasonably well the integrated Gamow-Teller transition strength. Electron-capture rates derived from the measured and theoretical strength distributions match reasonably well, especially at the higher stellar densities of importance for deleptonization during the collapse of the stellar core, since the electron-capture Q value is close to zero and the Fermi energy sufficiently high to ensure that the details of the strength distribution do not have a strong impact on the derived rates. At stellar densities in excess of 10(9)g/cm(3), the electron-capture rate based on a single-state approximation used in astrophysical simulations is slightly higher than the rates based on the data and the shell-model and QRPA calculations, likely due to the fact that the approximation includes temperature-dependent effects, which increase the rates. However, the difference is much smaller than that observed in recent studies of nuclei with Z < 40 near N = 50, suggesting that the single-state approximation does not account for Pauli-blocking effects for nuclei with Z < 40 that are much stronger than those for Nb-93 with Z = 41. |
| WOS关键词 | WEAK-INTERACTION RATES ; INTERMEDIATE-MASS NUCLEI ; LEVEL DENSITY ; COLLAPSE ; STARS ; AL-26 ; BEAM |
| 资助项目 | US National Science Foundation (NSF)[PHY-1913554] ; US National Science Foundation (NSF)[PHY-156554] ; US National Science Foundation (NSF)[PHY-1430152] ; US National Science Foundation (NSF)[PHY-1811855] ; US Department of Energy, in the Office of Nuclear Physics of the Office of Science ; DOE[DE-SC0014537] ; DOE[DE-AC02-05CH11231] ; China Scholarship Council as part of the FRIBCSC Fellowship ; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)[2018/04965-4] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000506591800001 |
| 出版者 | AMER PHYSICAL SOC |
| 资助机构 | US National Science Foundation (NSF) ; US Department of Energy, in the Office of Nuclear Physics of the Office of Science ; DOE ; China Scholarship Council as part of the FRIBCSC Fellowship ; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) |
| 源URL | [http://119.78.100.186/handle/113462/141476]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Gao, B. |
| 作者单位 | 1.Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA 2.Michigan State Univ, Joint Inst Nucl Astrophys, Ctr Evolut Elements, E Lansing, MI 48824 USA 3.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 4.Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA 5.Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo, Brazil 6.Univ Massachusetts, Dept Phys, Lowell, MA 01854 USA 7.Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA 8.Univ North Carolina Chapel Hill, Dept Phys & Astron, Chapel Hill, NC 27599 USA 9.Cent Michigan Univ, Mt Pleast, MI 48859 USA 10.Swarthmore Coll, Dept Phys & Astron, Swarthmore, PA 19081 USA |
| 推荐引用方式 GB/T 7714 | Gao, B.,Zegers, R. G. T.,Zamora, J. C.,et al. Gamow-Teller transitions to Zr-93 via the Nb-93(t, He-3 + gamma) reaction at 115 MeV/u and its application to the stellar electron-capture rates[J]. PHYSICAL REVIEW C,2020,101(1):10. |
| APA | Gao, B..,Zegers, R. G. T..,Zamora, J. C..,Bazin, D..,Brown, B. A..,...&Weisshaar, D..(2020).Gamow-Teller transitions to Zr-93 via the Nb-93(t, He-3 + gamma) reaction at 115 MeV/u and its application to the stellar electron-capture rates.PHYSICAL REVIEW C,101(1),10. |
| MLA | Gao, B.,et al."Gamow-Teller transitions to Zr-93 via the Nb-93(t, He-3 + gamma) reaction at 115 MeV/u and its application to the stellar electron-capture rates".PHYSICAL REVIEW C 101.1(2020):10. |
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来源：近代物理研究所
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