Stellar neutron capture rates for /sup 46/Ca and /sup 48/Ca

Journal Article · Mon Apr 01 04:00:00 EST 1985 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/163071· OSTI ID:5640717

Kaeppeller, F; Walter, G; Mathews, G J

Stellar neutron capture rates for /sup 46/Ca and /sup 48/Ca have been measured by the activation technique. Both kT = 25 keV Maxwellian-like incident neutron spectra and non-Maxwellian higher energy spectra have been utilized to study the possible role of individual capture resonances. Maxwellian-averaged (kT = 30 keV) cross sections of 5.7 +- 0.5 and 0.95 +- 0.09 mb are derived for /sup 46/Ca and /sup 48/Ca, respectively. The possibility of a neutron capture origin for /sup 46/Ca and /sup 48/Ca is discussed in the light of these new cross sections, as well as a mechanism for the production of the observed isotopic anomalies in inclusion EK-1-4-1 from the Allende meteorite.

• Research Organization: Kernforschungszentrum Karlsruhe, Institut fuer Kernphysik
• OSTI ID: 5640717
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 291:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ACTIVATION ANALYSIS
ALKALINE EARTH ISOTOPES
BARYON REACTIONS
CALCIUM 46
CALCIUM 48
CALCIUM ISOTOPES
CAPTURE
CHEMICAL ANALYSIS
CROSS SECTIONS
ENERGY RANGE
EVEN-EVEN NUCLEI
GAMMA SPECTRA
HADRON REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPE RATIO
ISOTOPES
KEV RANGE
KEV RANGE 10-100
METEORITES
NEUTRON REACTIONS
NEUTRON SPECTRA
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEOSYNTHESIS
SOLAR SYSTEM
SPECTRA
STABLE ISOTOPES
STARS
SYNTHESIS