Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nuclear Level Densities at High Excitation Energies and for Large
  Particle Numbers   Starting from an independent-particle model with a finite and arbitrary set
of single-particle energies, we develop an analytical approximation to the
many-body level density $\rho_A(E)$ and to particle-hole densities. We use
exact expressions for the low-order moments and cumulants to derive approximate
expressions for the coefficients of an expansion of these densities in terms of
orthogonal polynomials. The approach is asymptotically (mass number $A \gg 1$)
convergent and, for large $A$, covers about 20 orders of magnitude near the
maximum of $\rho_A(E)$ (i.e., about half the spectrum). Densities of accessible
states are calculated using the Fermi-gas model.

31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat