Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thick-Restart Block Lanczos Method for Large-Scale Shell-Model
  Calculations   We propose a thick-restart block Lanczos method, which is an extension of the
thick-restart Lanczos method with the block algorithm, as an eigensolver of the
large-scale shell-model calculations. This method has two advantages over the
conventional Lanczos method: the precise computations of the near-degenerate
eigenvalues, and the efficient computations for obtaining a large number of
eigenvalues. These features are quite advantageous to compute highly excited
states where the eigenvalue density is rather high. A shell-model code, named
KSHELL, equipped with this method was developed for massively parallel
computations, and it enables us to reveal nuclear statistical properties which
are intensively investigated by recent experimental facilities. We describe the
algorithm and performance of the KSHELL code and demonstrate that the present
method outperforms the conventional Lanczos method.

27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph