Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Nucleosynthesis of Li, Be, and B: contributions from the p + /sup 16/O reaction at 50--90 MeV

Journal Article · · Phys. Rev., C; (United States)
; ; ;
Cross sections fo the production of A = 6, 7, 8, 9, 10, and 11 isobars in the reaction of 50--90 MeV protons with oxygen are reported. Product masses were identified by time-of-flight techniques using either a channel-plate fast-timing device or rf fast timing. Mass, kinetic energy, and angular distributions are reported for the products. The measured cross sections are applied to theories of LiBeB nucleosynthesis which involve galactic--cosmic-ray or stellar-flare reactions as a source of these elements. Both of the models underproduce the observed /sup 7/Li//sup 6/Li ratio by an order of magnitude, which supports previous conclusions that an additional source of /sup 7/Li is required for its synthesis. However, the models give reasonable agreement for the /sup 11/B//sup 10/B, /sup 6/Li/Be and B//sup 6/Li ratios, although the galactic ray model predicts a /sup 11/B//sup 10/B ratio that is low by a factor of 2. In addition the B//sup 6/Li ratio is consistent only with a low value for the natural boron abundance.
Research Organization:
Department of Chemistry and Cyclotron Laboratory, University of Maryland, College Park, Maryland 20742
OSTI ID:
6134112
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 19:3; ISSN PRVCA
Country of Publication:
United States
Language:
English

Similar Records

Li, Be, and B production in reactions of 45--100 MeV protons with /sup 12/C: Astrophysical implications. [''B//sup 10/B, B/Be, /sup 7/Li//sup 6/Li, Li/Be, Li/B abundance ratios]
Journal Article · Sun Aug 01 00:00:00 EDT 1976 · Phys. Rev., C; (United States) · OSTI ID:7266744
Astrophysical production rates for Li, Be, and B isotopes from energetic /sup 1/H and /sup 4/He reactions with HeCNO nuclei
Journal Article · Sat Dec 14 23:00:00 EST 1985 · Astrophys. J.; (United States) · OSTI ID:5961954
The Revival of Galactic Cosmic-Ray Nucleosynthesis?
Journal Article · Sat May 01 00:00:00 EDT 1999 · Astrophysical Journal · OSTI ID:357594

Related Subjects

651325* -- Nuclear Properties & Reactions
A=6-19
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ALKALINE EARTH ISOTOPES
ANGULAR DISTRIBUTION
ASTROPHYSICS
BARYON REACTIONS
BERYLLIUM ISOTOPES
BORON ISOTOPES
CHARGED-PARTICLE REACTIONS
COSMIC RADIATION
CROSS SECTIONS
DISTRIBUTION
ENERGY
ENERGY RANGE
FRAGMENTATION
HADRON REACTIONS
IONIZING RADIATIONS
ISOTOPES
KINETIC ENERGY
LITHIUM ISOTOPES
MASS SPECTRA
MEV RANGE
MEV RANGE 10-100
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEOSYNTHESIS
OXYGEN 16 TARGET
PROTON REACTIONS
RADIATIONS
SPECTRA
TARGETS
TIME-OF-FLIGHT METHOD