Neutron capture cross sections of {sup 74}Ge, {sup 76}Ge, and {sup 75}As at 25 keV
- Forschungszentrum Karlsruhe, Institut fuer Kernphysik, D-76344 Eggenstein-Leopoldshafen (Germany)
The neutron capture cross sections of {sup 74}Ge, {sup 76}Ge, and {sup 75}As have been measured at the Karlsruhe Van de Graaff accelerator by means of the activation technique. The neutron source reaction {sup 7}Li(p,n){sup 7}Be was used for simulating a thermal energy distribution for kT=25 keV to determine the astrophysically relevant stellar cross sections directly. Based on an extended series of activations, consistent results could be obtained, corresponding to Maxwellian average cross sections at kT=30 keV of 37.6{+-}3.9 mb for {sup 74}Ge, 21.5{+-}1.8 mb for {sup 76}Ge, and 362{+-}19 mb for {sup 75}As. These results are more accurate than previous data and are, therefore, important for resolving previous discrepancies. By extrapolation Maxwellian averaged cross sections were derived for thermal energies from 5 to 100 keV. The implications of these results for the s-process abundances in massive stars and for the background conditions in double {beta} decay experiments are discussed.
- OSTI ID:
- 21289950
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 79, Issue 6; Other Information: DOI: 10.1103/PhysRevC.79.065802; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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