Test of Big-Bang Nucleosynthesis Model Predictions by Precision Measurement of the n+^1H->^2D+γ Cross Section at the WNR-Facility at LANL

Details Test of Big-Bang Nucleosynthesis Model Predictions by Precision Measurement of the n+^1H->^2D+γ Cross Section at the WNR-Facility at LANL Test of Big-Bang Nucleosynthesis Model Predictions by Precision Measurement of the n+^1H->^2D+γ Cross Section at the WNR-Facility at LANL

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.x7008e&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

A large uncertainty in testing the elemental abundance predictions of the Big Bang Nucleosynthesis models are the cross sections for the ^2D formation. An experiment to measure the n+^1H->^2D+γ reaction cross section is presently being performed at the high-energy neutron spallation source (WNR) at the Los Alamos Neutron Science Center (LANSCE) at Los Alamos National Laboratory (LANL). The white neutron source at WNR provides neutrons in the energy range from 10keV to over 600MeV. In the experiment we detect the γ rays emitted from the n+^1H->^2D+γ reaction with a high-resolution Compton-shielded Germanium detector. The signature of the reaction is a gamma ray whose energy depends on the incident neutron energy. The goal of the experiment is to measure the cross section in the neutron energy region between 20 and 200keV to a precision of 5%. The setup and the current status of the experiment will be described.

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