Stellar (n,γ) cross sections of p-process isotopes. II. Yb168, W180, Os184, Pt190, and Hg196

Details Stellar (n,γ) cross sections of p-process isotopes. II. Yb168, W180, Os184, Pt190, and Hg196 Stellar (n,γ) cross sections of p-process isotopes. II. Yb168, W180, Os184, Pt190, and Hg196

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phrvc..82c5806m&link_type=abstract

Physical Review C, vol. 82, Issue 3, id. 035806

Physics

1

Radiative Capture, Explosive Burning In Supernovae Shock Fronts, 150<=A<=189, 190<=A<=219

Scientific paper

The neutron-capture cross sections of Yb168, W180, Os184, Pt190, and Hg196 have been measured by means of the activation technique. The samples were irradiated in a quasistellar neutron spectrum of kT=25 keV, which was produced at the Karlsruhe 3.7-MV Van de Graaff accelerator via the Li7(p,n)Be7 reaction. Systematic uncertainties were investigated in repeated activations with different samples and by variation of the experimental parameters, that is, irradiation times, neutron fluxes, and γ-ray counting conditions. The measured data were converted into Maxwellian-averaged cross sections at kT=30 keV, yielding 1214±61, 624±54, 590±43, 511±46, and 201±11 mb for Yb168, W180, Os184, Pt190, and Hg196, respectively. The present results either represent first experimental data (Yb168, Os184, and Hg196) or could be determined with significantly reduced uncertainties (W180 and Pt190). These measurements are part of a systematic study of stellar (n,γ) cross sections of the stable p isotopes.

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