Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elastic alpha scattering experiments and the alpha-nucleus optical
  potential at low energies   High precision angular distribution data of ($\alpha$,$\alpha$) elastic
scattering are presented for the nuclei $^{89}$Y, $^{92}$Mo,
$^{106,110,116}$Cd, $^{112,124}$Sn, and $^{144}$Sm at energies around the
Coulomb barrier. Such data with small experimental uncertainties over the full
angular range (20-170 degrees) are the indispensable prerequisite for the
extraction of local optical potentials and for the determination of the total
reaction cross section $\sigma_{\rm{reac}}$.
  A systematic fitting procedure was applied to the presented experimental
scattering data to obtain comprehensive local potential parameter sets which
are composed of a real folding potential and an imaginary potential of
Woods-Saxon surface type. The obtained potential parameters were used in turn
to construct a new systematic $\alpha$-nucleus potential with very few
parameters. Although this new potential cannot reproduce the angular
distributions with the same small deviations as the local potential, the new
potential is able to predict the total reaction cross sections for all cases
under study.

17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th