Direct Urca Process in a Neutron Star Mantle

Details Direct Urca Process in a Neutron Star Mantle Direct Urca Process in a Neutron Star Mantle

2004-04-07

arxiv.org/abs/astro-ph/0404165v1

Astron.Astrophys. 421 (2004) 1143-1148

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures, submitted to A&A

Scientific paper

10.1051/0004-6361:20040288

We show that the direct Urca process of neutrino emission is allowed in two possible phases of nonspherical nuclei (inverse cylinders and inverse spheres) in the mantle of a neutron star near the crust-core interface. The process is open because neutrons and protons move in a periodic potential created by inhomogeneous nuclear structures. In this way the nucleons acquire large quasimomenta needed to satisfy momentum-conservation in the neutrino reaction. The appropriate neutrino emissivity in a nonsuperfluid matter is about 2--3 orders of magnitude higher than the emissivity of the modified Urca process in the stellar core. The process may noticeably accelerate the cooling of low-mass neutron stars.

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