Measurements of astrophysical reaction rates for radioactive samples

Conference · Sun Sep 25 04:00:00 EDT 1988 · AIP Conf. Proc.; (United States)

OSTI ID:6921360

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

Reaction rates for both big-band 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.

• Research Organization: Physics Division, Los Alamos National Laboratory, MS-D449, Los Alamos, New Mexico 87545
• OSTI ID: 6921360
• Report Number(s): CONF-871245-
• Conference Information: Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 170:1
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
651100 -- Nuclear Physics-- Experimental Techniques-- (1980-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASTRONOMY
ASTROPHYSICS
BARYON REACTIONS
BERYLLIUM 7 TARGET
CAPTURE
CHARGE EXCHANGE
CHLORINE 36 TARGET
DATA
DAYS LIVING RADIOISOTOPES
EXPERIMENTAL DATA
GAMMA ASTRONOMY
HADRON REACTIONS
INFORMATION
ISOTOPES
NEUTRON REACTIONS
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEOSYNTHESIS
NUMERICAL DATA
RADIOISOTOPES
SODIUM 22 TARGET
STAR EVOLUTION
SYNTHESIS
TARGETS
YEARS LIVING RADIOISOTOPES
YIELDS