Nuclear physics and astrophysics

Technical Report · Tue Sep 01 00:00:00 EDT 1992

DOI:https://doi.org/10.2172/7073919· OSTI ID:7073919

Schramm, D N; Olinto, A V

We have investigated a variety of research topics on the interface of nuclear physics and astrophysics during the past year. We have continued our study of dihyperon states in dense matter and have started to make a connection between their properties in the core of neutron stars with the ongoing experimental searches at Brookhaven National Laboratory. We started to build a scenario for the origin of gamma-ray bursts using the conversion of neutron stars to strange stars close to an active galactic nucleous. We have been reconsidering the constraints due to neutron star cooling rates on the equation of state for high density matter in the light, of recent findings which show that the faster direct Urca cooling process is possible for a range of nuclear compositions. We have developed a model for the formation of primordial magnetic fields due to the dynamics of the quark-hadron phase transition. Encouraged by the most recent observational developments, we have investigated the possible origin of the boron and beryllium abundances. We have greatly improved the calculations of the primordial abundances of these elements I>y augmenting the reaction networks and by updating the most recent experimental nuclear reaction rates. Our calculations have shown that the primordial abundances are much higher than previously thought but that the observed abundances cannot be explained by primordial sources alone. We have also studied the origin of the boron and beryllium abundances due to cosmic ray spallation. Finally, we have continued to address the solar neutrino problem by investigating the impact of astrophysical uncertainties on the MSW solution for a full three-family treatment of MSW mixing.

• Research Organization: Chicago Univ., IL (United States). Dept. of Astronomy and Astrophysics
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-91ER40606
• OSTI ID: 7073919
• Report Number(s): DOE/ER/40606-2; ON: DE93002042
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASTROPHYSICS
NEUTRON STARS
NUCLEAR PHYSICS
COSMIC GAMMA BURSTS
DIBARYONS
HYPERONS
MAGNETIC FIELDS
PHASE TRANSFORMATIONS
PROGRESS REPORT
QUARK MATTER
BARYONS
COSMIC RADIATION
DOCUMENT TYPES
ELEMENTARY PARTICLES
FERMIONS
HADRONS
IONIZING RADIATIONS
MATTER
PHYSICS
PRIMARY COSMIC RADIATION
RADIATIONS
STARS
STRANGE PARTICLES
661300* - Other Aspects of Physical Science- (1992-)
663000 - Nuclear Physics- (1992-)