Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Helium nuclei around the neutron drip line   Neutron rich He nuclei have been investigated using relativistic mean field
approach in co-ordinate space. Elastic partial scattering cross sections for
proton scattering in inverse kinematics have been calculated using the
theoretically obtained density for $^{6,8}$He and compared with experiment. The
energies of the low-lying resonance states in the neutron unstable nuclei
$^{5,7}$He have also been calculated and compared with experimental
observations.

1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg