Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the mass formula and Wigner and curvature energy terms   The efficiency of different mass formulas derived from the liquid drop model
including or not the curvature energy, the Wigner term and different powers of
the relative neutron excess $I$ has been determined by a least square fitting
procedure to the experimental atomic masses assuming a constant
R$_{0,charge}$/A$^{1/3}$ ratio. The Wigner term and the curvature energy can be
used independently to improve the accuracy of the mass formula. The different
fits lead to a surface energy coefficient of around 17-18 MeV, a relative sharp
charge radius r$_0$ of 1.22-1.23 fm and a proton form-factor correction to the
Coulomb energy of around 0.9 MeV.

31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc