β-delayed Fission in r-process Nucleosynthesis

被引：60

作者：

Mumpower, M. R. ^{[1
]}

Kawano, T. ^{[1
]}

Sprouse, T. M. ^{[2
]}

Vassh, N. ^{[2
]}

Holmbeck, E. M. ^{[2
]}

Surman, R. ^{[2
]}

Moller, P. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA

[2] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 869卷 / 01期

关键词：

binaries: close; gravitational waves; nuclear reactions; nucleosynthesis; abundances; NUCLEAR PROPERTIES; ELEMENTS; STATE; CONSISTENCY; ACCURACY; CAPTURE; MERGERS; ORIGIN; YIELDS; SPEED;

D O I：

10.3847/1538-4357/aaeaca

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present beta-delayed neutron emission and beta-delayed fission ( beta df) 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 beta-decay, we follow the statistical decay, taking into account competition between neutrons, gamma-rays, and fission. We find a region of the chart of nuclides where the probability of beta df is similar to 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 beta df, a decay mode for extremely neutron-rich heavy nuclei. In this decay mode, beta-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 beta df in rapid neutron-capture process (gamma-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 gamma-process peak.

引用

页数：6

共 50 条

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