Measurement of the Rb-85 and Rb-87 capture cross sections for s-process studies

Journal Article · Sat Apr 01 04:00:00 EST 1989 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/167351· OSTI ID:5813088

Beer, H; Macklin, R L

The neutron capture cross sections of Rb-85 and Rb-87 using the TOF technique are measured. From the differential data, Maxwellian-averaged capture cross sections are computed as a function of thermal energy kT = 5-100 keV. The results are combined with previous data to perform s-process calculations, especially with regard to the Kr-85-Rb-86 branchings. Solar s-process abundances are reproduced with a two-component phenomenological model below mass number 90, a single-flux weak s-process, and a pulsed s-process characterized by exponentially distributed neutron exposures. The solar s-process abundances, as well as s-process abundances from Ba stars and the Murchison meteorite, are studied in the framework of the asymptotic giant branch models. Constraints are derived with regard to the properties of the neutron pulses for a description of the empirical s-process data. 50 refs.

• Research Organization: Kernforschungszentrum Karlsruhe GmbH (Germany, F.R.); Oak Ridge National Lab., TN (USA)
• OSTI ID: 5813088
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 339; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640104 -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
ABUNDANCE
ALKALI METAL ISOTOPES
BARYON REACTIONS
CAPTURE
CONSTRAINTS
CROSS SECTIONS
HADRON REACTIONS
ISOTOPES
MAIN SEQUENCE STARS
MATHEMATICAL MODELS
METEORITES
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEOSYNTHESIS
RUBIDIUM ISOTOPES
S PROCESS
STAR EVOLUTION
STARS
SUN
SYNTHESIS
THERMONUCLEAR REACTIONS