Measurements of astrophysical reaction rates for radioactive samples

Conference · Thu Jan 01 04:00:00 EST 1987

DOI:https://doi.org/10.1063/1.37259· OSTI ID:5648449

Koehler, P E; O'Brien, H A; Bowman, C D

Reaction rates for both big-bang and stellar nucleosynthesis can be obtained from the measurement of (n,p) and (n,..gamma..) cross sections for radioactive nuclei. In the past, large backgrounds associated with the sample activity limited these types of measurements to radioisotopes with very long half lives. The advent of the low-energy, high-intensity neutron source at the Los Alamos Neutron Scattering CEnter (LANSCE) has greatly increased the number of nuclei which can be studied. Results of (n,p) measurements on samples with half lives as short as fifty-three days will be given. The astrophysics to be learned from these data will be discussed. Additional difficulties are encountered when making (n,..gamma..) rather than (n,p) measurements. However, with a properly designed detector, and with the high peak neutron intensities now available, (n,..gamma..) measurements can be made for nuclei with half lives as short as several weeks. Progress on the Los Alamos (n,..gamma..) cross-section measurement program for radioactive samples will be discussed. 25 refs., 3 figs., 1 tab.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5648449
• Report Number(s): LA-UR-87-4104; CONF-871245-2; ON: DE88004309
• Country of Publication: United States
• Language: English

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651420 -- Nuclear Properties & Reactions
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BERYLLIUM 7 TARGET
CHLORINE 36 TARGET
CROSS SECTIONS
DATA
DETECTION
EXPERIMENTAL DATA
HADRON REACTIONS
HALF-LIFE
INFORMATION
KINETICS
NEUTRON DETECTION
NEUTRON REACTIONS
NUCLEAR REACTION KINETICS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEOSYNTHESIS
NUMERICAL DATA
RADIATION DETECTION
REACTION KINETICS
S PROCESS
SODIUM 22 TARGET
STAR EVOLUTION
SYNTHESIS
TARGETS
TEMPERATURE DEPENDENCE