Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deep excursion beyond the proton dripline. I. Argon and chlorine isotope
  chains   The proton-unbound argon and chlorine isotopes have been studied by measuring
trajectories of their decay-in-flight products by using a tracking technique
with micro-strip detectors. The proton ($1p$) and two-proton ($2p$) emission
processes have been detected in the measured angular correlations
"heavy-fragment"+$p$ and "heavy-fragment"+$p$+$p$, respectively. The ground
states of the previously unknown isotopes $^{30}$Cl and $^{28}$Cl have been
observed for the first time, providing the $1p$-separation energies $S_p$ of
$-0.48(2)$ and $-1.60(8)$ MeV, respectively. The relevant systematics of $1p$
and $2p$ separations energies have been studied theoretically in the core+$p$
and core+$p$+$p$ cluster models. The first-time observed excited states of
$^{31}$Ar allow to infer the $2p$-separation energy $S_{2p}$ of 6(34) keV for
its ground state. The first-time observed state in $^{29}$Ar with $S_{2p} =
-5.50(18)$ MeV can be identified either as a ground or an excited state
according to different systematics.

12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math