Neutron capture cross section of 139La

Details Neutron capture cross section of 139La Neutron capture cross section of 139La

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phrvc..68c5801o&link_type=abstract

Physical Review C, vol. 68, Issue 3, id. 035801

Physics

22

Radiative Capture, Hydrostatic Stellar Nucleosynthesis, 90<=A<=149, Abundances, Chemical Composition

Scientific paper

The neutron capture cross section of 139La has been measured relative to that of 197Au by means of the activation method. The sample was irradiated in a quasistellar neutron spectrum for kT=25 keV generated via the 7Li(p,n)7Be reaction with the proton energy adjusted 30 keV above the threshold. Maxwellian averaged neutron capture cross sections were calculated for energies kT=5 100 keV. The new value for kT=30 keV is found to be 31.6±0.8 mb, 18% lower and considerably less uncertain than the previously recommended value of 38.4±2.7 mb. With these results the s- and r-process components could be more accurately determined, making lanthanum a reliable s- and r-process indicator in stellar spectroscopy.

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