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  • 1
    Electronic Resource
    Electronic Resource
    Neutrino-pair bremsstrahlung in collisions between neutrons and nuclei in neutron star matter (1977)
    Springer
    Astrophysics and space science 48 (1977), S. 159-164 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In neutron star matter over the density range 4.3×1011〈-ϱ≤4×1014 g cm−3 there are both free neutrons and neutron-rich nuclei. If there is a weak neutral current interaction between neutrinos and neutrons, as suggested by recent experiments, then when neutrons scatter off nuclei they may emit $$v\bar v$$ pairs as bremsstrahlung radiation. We calculate the associated emissivity for degenerate (but not superfluid) neutrons and uncorrelated (not crystallized) nuclei. We find that, under these conditions. this emissivity can under some conditions compare with that calculated by Festa and Ruderman for $$v\bar v$$ bremsstrahlung in electron-nucleus collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643047
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Deflagration of white dwarfs as a model for type-I supernovae (1985)
    Springer
    Astrophysics and space science 109 (1985), S. 277-285 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Carbon-oxygen white dwarfs may be the progenitors of type-I supernovae. Spherically-symmetric models of such dwarfs have been evolved from an artificial core incineration. The convectively unstable incinerated region was allowed to grow at a velocity prescribed by the mixing-length theory of convection. The mixing length can be varied to give different cases. In all the cases considered the dwarfs exploded and were totally disrupted. The calculations were stopped after the dwarf matter had gone into homologous expansion. The model with the best estimated mixing length incinerated 0.8M ⊙. The energy released in burning this amount of carbon-oxygen to56Ni provides a disrupted dwarf with velocities suitable for type-I supernovae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651274
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Neutrino scattering by phonons in neutron star matter (1978)
    Springer
    Astrophysics and space science 57 (1978), S. 409-417 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neutrinos couple through a weak neutral current to the density of matter, in particular to the neutron density. Density fluctuations, or phonons, in the neutron fluid may be emitted or absorbed by neutrinos passing through the matter. At high densities, temperatures and neutrino energies the neutrino mean free paths for phonon emission and absorption can be ≤106 cm. Significant changes in the neutrino momentum and energy accompany these processes. We present a model calculation for neutrino scattering by phonons, and representative numerical results for the neutrino mean free path and mean energy and momentum changes fork B T andE v both ranging from 1 to 27 MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00639333
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    One-photon and two-photon annihilation of positronium in strong magnetic fields (1978)
    Springer
    Astrophysics and space science 58 (1978), S. 83-88 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the presence of a strong magnetic field (such as those believed to be characteristic of neutron stars:B≳-1012 Gauss) positronium may annihilate through the emission of a single photon, the magnetic field providing the photon momentum. We report on calculations of the one-photon and two-photon annihilation rates for the ground state of positronium, for magnetic fields in the range (1–44)×1012 Gauss, and give, in the two-photon case, the minimum energy half-width of the emission line due to the momentum contributions from the magnetic field. We find that unless neutron stars have magnetic fields in excess of 1013 Gauss, it is unlikely that the one-photon process will be observable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645375
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    Paper (German National Licenses)
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