Volume 421, Number 3, July III 2004
|Page(s)||1143 - 1148|
|Section||Stellar structure and evolution|
|Published online||29 June 2004|
Direct Urca process in a neutron star mantle
Ioffe Physical Technical Institute, Politekhnicheskaya 26, 194021 St. Petersburg, Russia e-mail: email@example.com
2 Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland e-mail: firstname.lastname@example.org
3 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA e-mail: email@example.com
Corresponding author: M. E. Gusakov, firstname.lastname@example.org
Accepted: 1 April 2004
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.
Key words: stars: neutron / dense matter
© ESO, 2004
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