Measurements of the n+p→d+γ Cross Section for Big Bang Nucleosynthesis with the Spallation Neutron Source at the LOS Alamos Neutron Science Center

Details Measurements of the n+p→d+γ Cross Section for Big Bang Nucleosynthesis with the Spallation Neutron Source at the LOS Alamos Neutron Science Center Measurements of the n+p→d+γ Cross Section for Big Bang Nucleosynthesis with the Spallation Neutron Source at the LOS Alamos Neutron Science Center

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002asap.conf...58e&link_type=abstract

ASTROPHYSICS, SYMMETRIES, AND APPLIED PHYSICS AT SPALLATION NEUTRON SOURCES. Proceedings of the Workshop on ASAP 2002. Held 11-1

Astronomy and Astrophysics

Astrophysics

Scientific paper

A large uncertainty in testing the elemental abundance predictions of Big Bang Nucleosynthesis models arises from the imperfect knowledge of the cross section for the formation of deuterium (D). An experiment to measure the n+H→D+γ reaction cross section is presently being performed at the high-energy neutron facility (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 10 keV to over 600 MeV. In the experiment we detect the γ-rays emitted from the n+H→D+γ reaction with a high-resolution Compton-shielded Germanium detector. The signature of the reaction is a γ-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 30 and 500 keV to a precision of 3%. The setup and the current status of the experiment will be described.

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