Asymmetry of the neutrino mean free path in hot neutron matter under strong magnetic fields

被引:7
|
作者
Torres Patino, Julio [1 ]
Bauer, Eduardo [1 ,2 ]
Vidana, Isaac [3 ]
机构
[1] Consejo Nacl Invest Cient & Tecn, CCT La Plata, IFLP, La Plata, Buenos Aires, Argentina
[2] Univ Nacl La Plata, Fac Ciencias Astron & Geofis, La Plata, Buenos Aires, Argentina
[3] Univ Catania, Dipartimento Fis Ettore Majorana, Ist Nazl Fis Nucl, Via Santa Sofia 64, I-95123 Catania, Italy
关键词
SCATTERING; EMISSION; OPACITIES;
D O I
10.1103/PhysRevC.99.045808
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
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 <= rho <= 0.4 fm(-3) for several temperatures up to 30 MeV and magnetic field strengths from B = 0 up to B = 10(18) G. Polarized neutron matter is described within the nonrelativistic Brueckner-Hartree-Fock (BHF) approach using the Argonne V18 nucleon-nucleon potential supplemented with the Urbana IX three-nucleon force. The LNS Skyrme interaction is also used to describe polarized neutron matter in the Hartree-Fock approximation. 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 0.15 fm(-3) at a temperature T = 15 MeV, the asymmetry in the mean free path is found to be, for both models, approximate to 0.2% and approximate to 2% for B = 10(16) and B = 10(17) G, respectively, and approximate to 15% (approximate to 26%) for the BHF (Skyrme) model for B = 10(18) G.
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页数:16
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