Stellar neutron capture cross sections of the Nd isotopes

Details Stellar neutron capture cross sections of the Nd isotopes Stellar neutron capture cross sections of the Nd isotopes

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phrvc..57..391w&link_type=abstract

Physical Review C (Nuclear Physics), Volume 57, Issue 1, January 1998, pp.391-408

Physics

Nuclear Physics

24

Radiative Capture, Hydrostatic Stellar Nucleosynthesis, 90<=A<=149

Scientific paper

The neutron capture cross sections of 142Nd, 143Nd, 144Nd, 145Nd, 146Nd, and 148Nd have been measured in the energy range from 3 to 225 keV at the Karlsruhe 3.75 MV Van de Graaff accelerator. Neutrons were produced via the 7Li(p,n)7Be reaction by bombarding metallic Li targets with a pulsed proton beam. Capture events were registered with the Karlsruhe 4π Barium Fluoride Detector. The cross sections were determined relative to the gold standard. The experiment was difficult due to the small cross sections of the even isotopes at or near the magic neutron number N=82, and also since the isotopic enrichment of some samples was comparably low. The necessary corrections for capture of scattered neutrons and for isotopic impurities could be determined reliably thanks to the high efficiency and the spectroscopic quality of the BaF2 detector, resulting in a consistent set of (n,γ) cross sections for the six stable neodymium isotopes involved in the s process with typical uncertainties of 1.5-2 %. From these data, Maxwellian averaged cross sections were calculated between kT=10 and 100 keV. The astrophysical implications of these results were investigated in an s-process analysis, which deals with the role of the s-only isotope 142Nd for the Ns<σ> systematics near the magic neutron number N=82, the decomposition of the Nd abundances into the respective r-, s-, and p-process components, and the interpretation of isotopic anomalies in meteoritic material.

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