Measurements of astrophysical reaction rates for radioactive samples

Details Measurements of astrophysical reaction rates for radioactive samples Measurements of astrophysical reaction rates for radioactive samples

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aipc..170..143k&link_type=abstract

AIP Conference Proceedings, Volume 170, pp. 143-148 (1988).

Astronomy and Astrophysics

Astrophysics

Elementary Particle Processes, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Inelastic Neutron Scattering, Radiative Capture

Scientific paper

Reaction rates for both big-band and stellar nucleosynthesis can be obtained from the measurement of (n,p) and (n,γ) 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,γ) rather than (n,p) measurements. However, with a properly designed detector, and with the high peak neutron intensities now available, (n,γ) measurements can be made for nuclei with half lives as short as several weeks. Progress on the Los Alamos (n,γ) cross-section measurement program for radioactive samples will be discussed.

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