Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase-Space Exploration in Nuclear Giant Resonance Decay   The rate of phase-space exploration in the decay of isovector and isoscalar
giant quadrupole resonances in $^{40}$Ca is analyzed. The study is based on the
time dependence of the survival probability and of the spectrum of generalized
entropies evaluated in the space of 1p-1h and 2p-2h states. If the 2p-2h
background shows the characteristics typical for chaotic systems, the isovector
excitation evolves almost statistically while the isoscalar excitation remains
largely localized, even though it penetrates the whole available phase space.

20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat