Measurements of astrophysical reaction rates for radioactive samples

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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. ... continued below

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Pages: 11

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Koehler, P.E.; O'Brien, H.A. & Bowman, C.D. January 1, 1987.

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Description

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.

Physical Description

Pages: 11

Notes

NTIS, PC A03/MF A01.

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  • Workshop on nuclear spectroscopy of astrophysical sources, Washington, DC, USA, 14 Dec 1987

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  • Other: DE88004309
  • Report No.: LA-UR-87-4104
  • Report No.: CONF-871245-2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5648449
  • Archival Resource Key: ark:/67531/metadc1093649

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1987

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  • Feb. 10, 2018, 10:06 p.m.

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  • May 30, 2018, 6:05 p.m.

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Koehler, P.E.; O'Brien, H.A. & Bowman, C.D. Measurements of astrophysical reaction rates for radioactive samples, article, January 1, 1987; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1093649/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.