Neutron capture cross sections of Ge74, Ge76, and As75 at 25 keV

Details Neutron capture cross sections of Ge74, Ge76, and As75 at 25 keV Neutron capture cross sections of Ge74, Ge76, and As75 at 25 keV

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phrvc..79f5802m&link_type=abstract

Physical Review C, vol. 79, Issue 6, id. 065802

Astronomy and Astrophysics

Astrophysics

5

Radiative Capture, 59<=A<=89, Neutron Absorption, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

The neutron capture cross sections of Ge74, Ge76, and As75 have been measured at the Karlsruhe Van de Graaff accelerator by means of the activation technique. The neutron source reaction Li7(p,n)Be7 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 Ge74, 21.5±1.8 mb for Ge76, and 362±19 mb for As75. 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 β decay experiments are discussed.

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