Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin polarizabilities and polarizabilities of the nucleon studied by
  free and quasi-free Compton scattering at MAMI (Mainz)   In addition to the E2/M1 ratio of the N->$\Delta$ transition, the
electromagnetic polarizabilities and spin-polarizabilities are important
structure constants of the nucleon which serve as sensitive tests of chiral
perturbation theory and of models of the nucleon. Recently, these quantities
have been investigated experimentally at MAMI (Mainz) by high-precision Compton
scattering using hydrogen and deuterium targets, where for the latter the
method of quasi-free scattering has been applied.

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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess