Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Asymmetry of the neutrino mean free path in hot neutron matter under
  strong magnetic fields   The neutrino mean free path in neutron matter under a strong magnetic field
is evaluated for the inelastic scattering reaction and studied as a function of
the neutron matter density in the range $0.05 \leq \rho \leq 0.4$ fm$^{-3}$ for
several temperatures up to 30 MeV and magnetic field strengths B=0 G, $10^{18}$
G and $2.5\times 10^{18}$ G. Polarized neutron matter is described within the
non--relativistic Brueckner--Hartree--Fock (BHF) approach using the Argonne V18
nucleon-nucleon potential supplemented with the Urbana IX three-nucleon force.
Explicit expressions of the cross section per unit volume for the scattering of
a neutrino with a spin up or spin down neutron are derived from the Fermi
Golden rule. Our results show that the mean free path depends strongly on the
angle of the incoming neutrino, leading to an asymmetry in this quantity. This
asymmetry depends on the magnetic field intensity and on the density, but it is
rather independent of the temperature. For a density of $0.16$ fm$^{-3}$ at a
temperature T$=30$MeV, the asymmetry in the mean free path is found to be of
$\sim 15\%$ for B=$10^{18}$G and $\sim 38\%$ for B=$2.5 \times 10^{18}$G.

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The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph