Physics – Nuclear Physics – Nuclear Theory
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.8505m&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #85.05; Bulletin of the American Astronomical Society, Vol. 24, p.1259
Physics
Nuclear Physics
Nuclear Theory
Scientific paper
We explore the possibility that decompressing neutron star material may be a source for the isotropic gamma-ray bursts observed by the Compton Gamma Ray Observatory. Such material might be ejected during the collision or tidal disruption of a neutron star in a binary sytem or as a result of neutron star seismic activity. Without gravitational confinement, this extremely neutron-rich material will decompress and heat up through a series of fissions, beta (-) decays, and photodissociations. It will then recombine in an r-process like environment. As the density drops and the material becomes optically thin, short-lived nuclei decay back to stability emitting a burst of gamma rays on a time scale of msec to sec. The resulting gamma-ray spectrum will be directly observable if the burst luminosity is low enough that a pair-dominated photosphere which would reprocess the gamma-ray spectrum is not formed. We report on efforts to model the resulting gamma-ray spectrum, which requires estimates of beta (-) decay, gamma emission, beta -delayed neutron emission, and photodissociation rates for many neutron rich nuclei. This work will eventually be coupled to hydrodynamic and radiation transport codes, in an effort to explain some of the observed gamma-ray bursts. () Work at Lawrence Livermore National Laboratory was performed under the auspices of the U.S. DoE under contract No. W-7405-ENG-48 and DOE Nuclear Theory Grant SF-ENG-48.
Aufderheide Maurice B.
Mathews Grant J.
Meyer Bradley S.
Ressell Ted M.
Rogers Robert D.
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