Stellar neutron capture on 180 Tam . I. Cross section measurement between 10 keV and 100 keV

Details Stellar neutron capture on 180 Tam . I. Cross section measurement between 10 keV and 100 keV Stellar neutron capture on 180 Tam . I. Cross section measurement between 10 keV and 100 keV

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phrvc..69e5801w&link_type=abstract

Physical Review C, vol. 69, Issue 5, id. 055801

Astronomy and Astrophysics

Astrophysics

4

Radiative Capture, Hydrostatic Stellar Nucleosynthesis, 150<=A<=189, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

The neutron capture cross section of 180 Tam has been measured at energies between 10 keV and 100 keV in a time-of-flight experiment at the Karlsruhe 3.7 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, and gold was used as a cross section standard. Though the world supply of enriched 180 Tam was available for this experiment, the sample consisted of only 150 mg Ta2 O5 with a 180 Tam content of only 5.5% . The difficult separation of the comparably few capture events in 180 Tam from the much larger background due to captures in 181 Ta could be achieved by means of the Karlsruhe 4π barium fluoride detector, taking advantage of its combination of high efficiency, good energy resolution, and high granularity. The cross section was determined with an overall uncertainty of better than 10% in the energy range from 30 keV to 100 keV and could be used for renormalizing statistical model calculations in the entire energy range of astrophysical interest, which had predicted about two times larger values. Based on these first experimental data, Maxwellian averaged neutron capture cross sections were calculated for thermal energies between kT=8 keV and 100 keV .

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