Research in nuclear astrophysics: Stellar collapse and supernovae
The interaction between nuclear theory and some outstanding problems in astrophysics has been examined. We have been actively researching both the astrophysics of gravitational collapse, neutron star birth, and the emission of neutrinos from supernovae, on the one hand, and the nuclear physics of the equation of state of hot, dense matter on the other hand. There is close coupling between nuclear theory and supernova and neutron star phenomenon; in fact, nuclear matter properties, especially supernuclear densities, might be best delineated by astrophysical considerations. Our research has also focused on the neutrinos emitted from supernovae, since they are the only available observables of the internal supernova mechanism. The recent observations of neutrinos from SN 1987A proved to be in remarkable agreement with models we pioneered prior to its explosion. We have also developed a novel hydrodynamical code in which shocks are treated via Riemann resolution rather than with artificial viscosity. We have also extended models of the neutrino emission and cooling of neutron stars to include the effects of rotation. The Lattimer compressible liquid drop model is the basis of our equation of state. We have developed a rapid version for use in hydrodynamic codes that retains essentially all the physics of earlier, more detailed equations of state. We have also focused on the nuclei-nuclear matter phase transition just below nuclear matter density, including the probable nuclear deformations and the possible inside-out'' phase of bubbles, which could be of major importance in supernovae models. Work also progressed toward understanding the origin of the r-process elements, through focusing on the neutron star decompression model.
- Research Organization:
- State Univ. of New York, Stony Brook, NY (USA). Dept. of Earth and Space Sciences
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG02-87ER40317
- OSTI ID:
- 6209743
- Report Number(s):
- DOE/ER/40317-3; ON: DE91005988; TRN: 91-001517
- Country of Publication:
- United States
- Language:
- English
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Research in nuclear astrophysics: Stellar collapse and supernovae
Research in astrophysics: Stellar collapse and supernovae: Termination report, August 1, 1980-November 30, 1986
Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASTROPHYSICS
NUCLEAR THEORY
GRAVITATIONAL COLLAPSE
SUPERNOVAE
EQUATIONS OF MOTION
NEUTRINOS
NEUTRON STARS
NUCLEAR MATTER
PROGRESS REPORT
R PROCESS
WEINBERG-SALAM GAUGE MODEL
DIFFERENTIAL EQUATIONS
DOCUMENT TYPES
ELEMENTARY PARTICLES
EQUATIONS
ERUPTIVE VARIABLE STARS
FERMIONS
FIELD THEORIES
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MATTER
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE MODELS
STAR EVOLUTION
STARS
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
VARIABLE STARS
653000* - Nuclear Theory
640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar
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