Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Longitudinal vector form factors in weak decays of nuclei   The longitudinal form factors of the weak vector current of particles with
spin $ J = 1/2 $ and isospin $ I = 1/2 $ are determined by the mass difference
and the charge radii of members of the isotopic doublets. The most promising
reactions to measure these form factors are the reactions with large momentum
transfers involving the spin-1/2 isotopic doublets with a maximum mass
splitting. Numerical estimates of longitudinal form factors are given for
nucleons and eight nuclear spin-1/2 isotopic doublets.

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The categories of this paper are: math
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
9
The categories of this paper are: nlin