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Dependence of weak interaction rates on the nuclear composition during stellar core collapse

Furusawa, Shun and Nagakura, Hiroki and Sumiyoshi, Kohsuke and Kato, Chinami and Yamada, Shoichi (2017) Dependence of weak interaction rates on the nuclear composition during stellar core collapse. Physical Review C, 95 (2). Art. No. 025809. ISSN 2469-9985. https://resolver.caltech.edu/CaltechAUTHORS:20170227-085133716

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Abstract

We investigate the influences of the nuclear composition on the weak interaction rates of heavy nuclei during the core collapse of massive stars. The nuclear abundances in nuclear statistical equilibrium (NSE) are calculated by some equation of state (EOS) models including in-medium effects on nuclear masses. We systematically examine the sensitivities of electron capture and neutrino-nucleus scattering on heavy nuclei to the nuclear shell effects and the single-nucleus approximation. We find that the washout of the shell effect at high temperatures brings significant change to weak rates by smoothing the nuclear abundance distribution: the electron capture rate decreases by ∼20% in the early phase and increases by ∼40% in the late phase at most, while the cross section for neutrino-nucleus scattering is reduced by ∼15%. This is because the open-shell nuclei become abundant instead of those with closed neutron shells as the shell effects disappear. We also find that the single-nucleus description based on the average values leads to underestimations of weak rates. Electron captures and neutrino coherent scattering on heavy nuclei are reduced by ∼80% in the early phase and by ∼5% in the late phase, respectively. These results indicate that NSE like EOS accounting for shell washout is indispensable for the reliable estimation of weak interaction rates in simulations of core-collapse supernovae.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/PhysRevC.95.025809DOIArticle
http://journals.aps.org/prc/abstract/10.1103/PhysRevC.95.025809PublisherArticle
https://arxiv.org/abs/1701.08414arXivDiscussion Paper
ORCID:
AuthorORCID
Nagakura, Hiroki0000-0002-7205-6367
Sumiyoshi, Kohsuke0000-0002-9224-9449
Kato, Chinami0000-0003-4213-0076
Yamada, Shoichi0000-0002-2166-5605
Additional Information:© 2017 American Physical Society. Received 6 August 2016; published 24 February 2017. S.F. and H.N. are supported by the Japan Society for the Promotion of Science Postdoctoral Fellowships for Research Abroad. We are grateful to the Goethe Graduate Academy for proofreading. H.N. was partially supported at Caltech through NSF Award No. TCAN AST-1333520. Some numerical calculations were carried out on the PC cluster at the Center for Computational Astrophysics, National Astronomical Observatory of Japan. This work is supported in part by the usage of supercomputer systems through the Large Scale Simulation Program (Grants No. 15/16/-08 and No. 16/17-11) of the High Energy Accelerator Research Organization (KEK) and Post-K Projects (Grants No. hp 150225, No. hp160071, and No. hp160211) at K-computer, RIKEN AICS, as well as the resources provided by the RCNP at Osaka University, the YITP at Kyoto University, the University of Tokyo, and the JLDG. This work was supported by Grants-in-Aid for the Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan (Grants No. 24103006, No. 24244036, No. 16H03986, No. 15K05093, and No. 24105008).
Funders:
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)UNSPECIFIED
NSFAST-1333520
High Energy Accelerator Research Organization (KEK)15/16/-08
High Energy Accelerator Research Organization (KEK)16/17-11
High Energy Accelerator Research Organization (KEK)hp150225
High Energy Accelerator Research Organization (KEK)hp160071
High Energy Accelerator Research Organization (KEK)hp160211
Ministry of Education, Culture, Sports, Science and Technology (MEXT)24103006
Ministry of Education, Culture, Sports, Science and Technology (MEXT)24244036
Ministry of Education, Culture, Sports, Science and Technology (MEXT)16H03986
Ministry of Education, Culture, Sports, Science and Technology (MEXT)15K05093
Ministry of Education, Culture, Sports, Science and Technology (MEXT)24105008
Issue or Number:2
Record Number:CaltechAUTHORS:20170227-085133716
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170227-085133716
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74538
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 Feb 2017 18:13
Last Modified:03 Oct 2019 16:39

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