Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inverted Pairing and Excitation Induced by Quadrupole-Quadrupole
  Interaction   In this paper, eit is shown for a single-$j$ shell that the intrinsic
excitations induced by the quadrupole-quadrupole interaction can be viewed as
that due to the inverted surface-delta interaction whose multipole-pairing
component with the largest spin is the dominant term and is attractive. This
allow us to trace the origin of the recently introduced optimum pair
description of rotation and leads naturally to analytical expressions for the
rotational energies for the various bands in a single $j$-shell with the
quadrupole-quadrupole interaction.

31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol