Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin magnetization of small metallic grains   Small metallic grains which satisfy the conditions of the universal
Hamiltonian are considered. It is shown that for such grains the effects of the
interactions in the spin channel and in the Cooper channel on their spin
magnetization are well separated, thus allowing the determination of the
interaction parameters within this model. In particular, the existence of
pairing correlations in small grains and the sign of the interaction in the
Cooper channel can be uniquely determined.

18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math