Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleon deformation and atomic spectroscopy   Recent ineleastic electron-proton scattering experiments have led to rather
accurate values for the N->Delta transition quadrupole moment Q(N->Delta).The
experimental results imply a prolate (cigar-shaped) intrinsic deformation of
the nucleon. The nonsphericity of the proton's charge distribution might be
seen in the spectrum of atomic hydrogen. The possibilities and limitations for
determining the geometric shape of the nucleon in an atomic physics experiment
are discussed.

11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph