Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $\beta$-delayed fission in $r$-process nucleosynthesis   We present $\beta$-delayed neutron emission and $\beta$-delayed fission
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 $\beta$-delayed fission is $\sim100$%, that 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 $\beta$-delayed
fission, a new decay mode for extremely neutron-rich heavy nuclei. In this new
decay mode, $\beta$-decay can be followed by multiple neutron emission leading
to subsequent daughter generations which each have a probability to fission. We
explore the impact of $\beta$-delayed fission 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.

17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn