Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A unique decay process: beta delayed emission of a proton and a neutron
  by the $^{11}$Li halo nucleus   The neutron-rich $^{11}$Li halo nucleus is unique among nuclei with known
separation energies by its ability to emit a proton and a neutron in a $\beta$
decay process. The branching ratio towards this rare decay mode is evaluated
within a three-body model for the initial bound state and with Coulomb
three-body final scattering states. The branching ratio should be comprised
between two extreme cases, i.e.\ a lower bound $6 \times 10^{-12}$ obtained
with a pure Coulomb wave and an upper bound $5 \times 10^{-10}$ obtained with a
plane wave. A simple model with modified Coulomb waves provides plausible
values between between $0.8 \times 10^{-10}$ and $2.2 \times 10^{-10}$ with
most probable total energies of the proton and neutron between 0.15 and 0.3
MeV.

17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph