Neutron capture and total cross sections for /sup 48/Ca: Astrophysical implications

Conference · Tue Jan 15 00:00:00 EST 1985 · AIP Conf. Proc.; (United States)

OSTI ID:5710551

Carlton, R F; Harvey, J A; Hill, N W; Macklin, R L

Attempts to understand abundance anomalies of the Ca isotopes in the Allende meteorite via the n..beta..-process require 30-keV Maxwellian averaged capture cross sections. Experimental data on /sup 48/Ca in this energy region of astrophysical significance is important since a single resonance in this vicinity could dominate the caputre cross section. Neutron capture and total cross section measurements have been performed at ORELA on a 9.97-g sample of CaCO/sub 3/, enriched to 96% /sup 48/Ca, over the energy ranges 10 eV-500 keV (sigma..gamma..) and 10 keV-4 MeV (sigmaT). Only two small resonances were found for /sup 48/Ca in the 30-keV energy region (at 19.3 and 106.9 keV) and those only in capture. Their contribution to the 30-keV-averaged cross section is only 50 ..mu..b compared to 1.0 mb calculated from direct capture. The p-wave strength and large d/sub 5/2/ strength observed above 150 keV do no contribute significantly to the 30 keV capture.

• Research Organization: Middle Tennessee State University, Murfreesboro, TN 37132
• OSTI ID: 5710551
• Report Number(s): CONF-840906-
• Journal Information: AIP Conf. Proc.; (United States), Vol. 125:1; Conference: Capture gamma-ray spectroscopy conference, Knoxville, TN, USA, 10 Sep 1984
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CALCIUM 48 TARGET
NEUTRON REACTIONS
CAPTURE
CROSS SECTIONS
EXCITATION FUNCTIONS
GAMMA RADIATION
KEV RANGE
BARYON REACTIONS
ELECTROMAGNETIC RADIATION
ENERGY RANGE
FUNCTIONS
HADRON REACTIONS
IONIZING RADIATIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
RADIATIONS
TARGETS
651520* - Nuclear Properties & Reactions
A=39-58
Experimental