Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Beta-delayed-neutron studies of $^{135,136}$Sb and $^{140}$I performed
  with trapped ions   Beta-delayed-neutron ($\beta$n) spectroscopy was performed using the
Beta-decay Paul Trap and an array of radiation detectors. The $\beta$n
branching ratios and energy spectra for $^{135,136}$Sb and $^{140}$I were
obtained by measuring the time of flight of recoil ions emerging from the
trapped ion cloud. These nuclei are located at the edge of an isotopic region
identified as having $\beta$n branching ratios that impact the r-process
abundance pattern around the A~130 peak. For $^{135,136}$Sb and $^{140}$I,
$\beta$n branching ratios of 14.6(11)%, 17.6(28)%, and 7.6(28)% were
determined, respectively. The $\beta$n energy spectra obtained for $^{135}$Sb
and $^{140}$I are compared with results from direct neutron measurements, and
the $\beta$n energy spectrum for $^{136}$Sb has been measured for the first
time.

16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin