With consideration for the variation of the neutron star matter density described by the realistic equation of state we have considered in detail the "boundary effect" based upon neutrino oscillations in a magnetic field, i.e., the transition of half the active neutrinos under the influence of a magnetic field to the sterile state when leaving the neutron star. Basing upon the numerical calculations performed we have concluded that neutrino oscillations may become essential in the regions near the surface of the neutrino star and up to the distances of the order of 600 star radii.
Department of Theoretical Physics, Department of Quantum Statistics and Field Theory, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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