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

Journal Article · Fri May 02 00:00:00 EDT 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4874100· OSTI ID:22280492

Shibagaki, S.; Kajino, T. ^[1]; Chiba, S. ^[2]; Lorusso, G.; Nishimura, S. ^[3]; Mathews, G. J. ^[4]

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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)

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.

• OSTI ID: 22280492
• Journal Information: AIP Conference Proceedings, Vol. 1594, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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