Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First measurement of several $\beta$-delayed neutron emitting isotopes
  beyond N=126   The $\beta$-delayed neutron emission probabilities of neutron rich Hg and Tl
nuclei have been measured together with $\beta$-decay half-lives for 20
isotopes of Au, Hg, Tl, Pb and Bi in the mass region N$\gtrsim$126. These are
the heaviest species where neutron emission has been observed so far. These
measurements provide key information to evaluate the performance of nuclear
microscopic and phenomenological models in reproducing the high-energy part of
the $\beta$-decay strength distribution. In doing so, it provides important
constraints to global theoretical models currently used in $r$-process
nucleosynthesis.

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The categories of this paper are: hep-ph
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn