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Title: Realistic fission models, new beta-decay half-lives and the r-process in neutron star mergers

Almost half of heavy nuclei beyond iron are considered to be produced by rapid neutron capture process (r-process). This process occurs in the neutron-rich environment such as core-collapse supernovae or neutron star mergers, but the main production site is still unknown. In the r-process of neutron star mergers, nuclear fission reactions play an important role. Also beta-decay half-lives of magic nuclei are crucial for the r-process. We have carried out r-process nucleosynthesis calculations based upon new theoretical estimates of fission fragment distributions and new beta-decay half-lives for N=82 nuclei measured at RIBF-RIKEN. We investigate the effect of nuclear fission on abundance patterns in the matter ejected from neutron star mergers with two different fission fragment mass distributions. We also discuss how the new experimental beta-decay half-lives affect the r-process.
Authors:
;  [1] ;  [2] ; ;  [3] ;  [4]
  1. Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan and National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)
  2. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, 152-8850 (Japan)
  3. RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
  4. Center for Astrophysics, Department of Physics, University of Notre Dame, IN 46556 (United States)
Publication Date:
OSTI Identifier:
22280492
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1594; Journal Issue: 1; Conference: OMEG12: 12. international symposium on origin of matter and evolution of galaxies, Tsukuba (Japan), 18-21 Nov 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BETA DECAY; CAPTURE; ELEMENT ABUNDANCE; FISSION; FISSION FRAGMENTS; HALF-LIFE; HEAVY NUCLEI; JAPANESE ORGANIZATIONS; MAGIC NUCLEI; MASS DISTRIBUTION; NEUTRON REACTIONS; NEUTRON STARS; NUCLEOSYNTHESIS; R PROCESS; SUPERNOVAE