Quasistellar spectrum for neutron activation measurements at kT=5keV

Details Quasistellar spectrum for neutron activation measurements at kT=5keV Quasistellar spectrum for neutron activation measurements at kT=5keV

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvc..71b5803h&link_type=abstract

Physical Review C, vol. 71, Issue 2, id. 025803

Physics

11

Neutron Sources, Radiative Capture, Hydrostatic Stellar Nucleosynthesis

Scientific paper

We have measured the neutron energy spectrum of the 18O(p,n)18F reaction at a proton energy of 2582 keV, 8 keV above the reaction threshold. At this energy the resulting neutron spectrum resembles almost perfectly a Maxwellian distribution at a thermal energy of kT=5.1±0.1keV. Since all neutrons are emitted in a forward cone of 140∘ opening angle, this reaction can be used for neutron activation measurements similar to the 7Li(p,n)7Be reaction, which is known for producing a thermal spectrum with kT=25keV. Measured neutron capture cross sections at kT=5.1keV and kT=25keV can be used to interpolate to kT=8keV, which characterizes the dominant neutron exposure during s-process nucleosynthesis in thermally pulsing low-mass AGB stars. In a first application of this new method the Maxwellian-averaged neutron capture cross section of 138Ba was measured to be <σv>/vT=13.0±0.5mb at kT=5.1keV.

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