β-delayed Fission in r-process Nucleosynthesis

Mumpower, M. R.; Kawano, T.; Sprouse, T. M.; Vassh, N.; Holmbeck, E. M.; Surman, R.; Möller, P.

doi:10.3847/1538-4357/aaeaca

Title: β-delayed Fission in r-process Nucleosynthesis

Journal Article · Thu Dec 06 00:00:00 EST 2018 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aaeaca· OSTI ID:1711369

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Notre Dame, IN (United States)

In this work, we present β-delayed neutron emission and β-delayed fission (βdf) calculations for heavy, neutron-rich nuclei using the coupled Quasi-Particle Random Phase Approximation plus Hauser-Feshbach (QRPA+HF) approach. From the initial population of a compound nucleus after β-decay, we follow the statistical decay, taking into account competition between neutrons, γ-rays, and fission. We find a region of the chart of nuclides where the probability of βdf is ~100%, which likely prevents the production of superheavy elements in nature. For a subset of nuclei near the neutron dripline, neutron multiplicity and the probability of fission are both large, leading to the intriguing possibility of multi-chance βdf, a decay mode for extremely neutron-rich heavy nuclei. In this decay mode, β-decay can be followed by multiple neutron emission, leading to subsequent daughter generations that each have a probability to fission. We explore the impact of βdf in rapid neutron-capture process (r-process) nucleosynthesis in the tidal ejecta of a neutron star–neutron star merger and show that it is a key fission channel that shapes the final abundances near the second r-process peak.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: 89233218CNA000001; SC0013039

OSTI ID:: 1711369

Report Number(s):: LA-UR-18-21034; TRN: US2204645

Journal Information:: The Astrophysical Journal (Online), Vol. 869, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Gamma Rays from Kilonova: A Potential Probe of r -process Nucleosynthesis Korobkin, Oleg; Hungerford, Aimee M.; Fryer, Christopher L. The Astrophysical Journal, Vol. 889, Issue 2 https://doi.org/10.3847/1538-4357/ab64d8	journal	February 2020
Actinide-rich and Actinide-poor r -process-enhanced Metal-poor Stars Do Not Require Separate r -process Progenitors Holmbeck, Erika M.; Frebel, Anna; McLaughlin, G. C. The Astrophysical Journal, Vol. 881, Issue 1 https://doi.org/10.3847/1538-4357/ab2a01	journal	August 2019
Actinide-rich and Actinide-poor $r$-Process Enhanced Metal-Poor Stars do not Require Separate $r$-Process Progenitors Holmbeck, Erika M.; Frebel, Anna; McLaughlin, G. C. arXiv https://doi.org/10.48550/arxiv.1904.02139	text	January 2019
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