Constraints for stellar electron-capture rates on Kr-86 via the Kr-86(t, He-3 + gamma)Br-86 reaction and the implications for core-collapse supernovae
文献类型：期刊论文
| 作者 | Titus, E. R.1,2,3; Ney, E. M.4; Zegers, R. G. T.1,2,3; Bazin, D.1,3; Belarge, J.1; Bender, P. C.5; Brown, B. A.1,2,3; Campbell, C. M.6; Elman, B.1,3; Engel, J.4 |
| 刊名 | PHYSICAL REVIEW C
 |
| 出版日期 | 2019-10-22 |
| 卷号 | 100期号:4页码:14 |
| ISSN号 | 2469-9985 |
| DOI | 10.1103/PhysRevC.100.045805 |
| 通讯作者 | Zegers, R. G. T.(zegers@nscl.msu.edu) |
| 英文摘要 | Background: In the late stages of stellar core collapse just prior to core bounce, electron captures on medium-heavy nuclei drive deleptonization. Therefore, simulations require the use of accurate reaction rates. Nuclei with neutron number near N = 50 above atomic number Z = 28 play an important role. Rates presently used in astrophysical simulations rely primarily on a relatively simple single-state approximation. In order to improve the accuracy of the astrophysical simulations, experimental data are needed to test the electron-capture rates and to guide the development of better theoretical models and astrophysical simulations. Purpose: The purpose of the present work was to measure the Gamow-Teller transition strength from Kr-86 to Br-86, to derive the stellar electron-capture rates based on the extracted strengths, and to compare the derived rates with rates based on shell-model and quasiparticle random-phase approximation (QRPA) Gamow-Teller strengths calculations, as well as the single-state approximation. An additional purpose was to test the impact of using improved electron-capture rates on the late evolution of core-collapse supernovae. Method: The Gamow-Teller strengths from Kr-86 were extracted from the Kr-86(t, He-3 + gamma) charge-exchange reaction at 115MeV/u. The electron-capture rates were calculated as a function of stellar density and temperature. Besides the case of Kr-86, the electron-capture rates based on the QRPA calculations were calculated for 78 additional isotopes near N = 50 above Z = 28. The impact of using these rates instead of those based on the single-state approximation is studied in a spherically symmetrical simulation of core collapse just prior to bounce. Results: The derived electron-capture rates on Kr-86 from the experimental Gamow-Teller strength distribution are much smaller than the rates estimated based on the single-state approximation. Rates based on Gamow-Teller strengths estimated in shell-model and QRPA calculations are more accurate. The core-collapse supernova simulation with electron-capture rates based on the QRPA calculations indicate a significant reduction in the deleptonization during the collapse phase. Conclusions: It is important to utilize microscopic theoretical models that are tested by experimental data to constrain and estimate Gamow-Teller strengths and derived electron-capture rates for nuclei near N = 50 that are inputs for astrophysical simulations of core-collapse supernovae and their multimessenger signals, such as the emission of neutrinos and gravitational waves. |
| WOS关键词 | WEAK INTERACTION RATES ; INTERMEDIATE-MASS NUCLEI ; SHELL NUCLEI ; RATE TABLES ; COLLAPSE ; INTERPOLATION ; STRENGTH ; EQUATION ; STARS ; STATE |
| 资助项目 | Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)[2018/04965-4] ; U.S. National Science Foundation (NSF)[PHY-156554] ; U.S. National Science Foundation (NSF)[PHY-1430152] ; U.S. National Science Foundation (NSF)[PHY-1811855] ; U.S. National Science Foundation (NSF)[PHY-1913554] ; U.S. Department of Energy, in the Office of Nuclear Physics of the Office of Science ; DOE[DE-SC0014537] ; DOE[DE-AC02-05CH11231] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| 出版者 | AMER PHYSICAL SOC |
| WOS记录号 | WOS:000491467000006 |
| 资助机构 | Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) ; U.S. National Science Foundation (NSF) ; U.S. Department of Energy, in the Office of Nuclear Physics of the Office of Science ; DOE |
| 源URL | [http://119.78.100.186/handle/113462/141761]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Zegers, R. G. T. |
| 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.Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA 4.Univ North Carolina Chapel Hill, Dept Phys & Astron, Chapel Hill, NC 27599 USA 5.Univ Massachusetts, Dept Phys, Lowell, MA 01854 USA 6.Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA 7.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China 8.Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo, Brazil |
| 推荐引用方式 GB/T 7714 | Titus, E. R.,Ney, E. M.,Zegers, R. G. T.,et al. Constraints for stellar electron-capture rates on Kr-86 via the Kr-86(t, He-3 + gamma)Br-86 reaction and the implications for core-collapse supernovae[J]. PHYSICAL REVIEW C,2019,100(4):14. |
| APA | Titus, E. R..,Ney, E. M..,Zegers, R. G. T..,Bazin, D..,Belarge, J..,...&Zamora, J. C..(2019).Constraints for stellar electron-capture rates on Kr-86 via the Kr-86(t, He-3 + gamma)Br-86 reaction and the implications for core-collapse supernovae.PHYSICAL REVIEW C,100(4),14. |
| MLA | Titus, E. R.,et al."Constraints for stellar electron-capture rates on Kr-86 via the Kr-86(t, He-3 + gamma)Br-86 reaction and the implications for core-collapse supernovae".PHYSICAL REVIEW C 100.4(2019):14. |
入库方式： OAI收割
来源：近代物理研究所
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