Measuring the Parity-Violating Asymmetry in n + p arrow d + γ .

Details Measuring the Parity-Violating Asymmetry in n + p arrow d + γ . Measuring the Parity-Violating Asymmetry in n + p arrow d + γ .

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apri13002g&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

The NPDGamma experiment is currently under construction at the Los Alamos Neutron Science Center. The goal of the experiment is to measure the parity-violating gamma asymmetry A_γ in the reaction n + p arrow d + γ to an accuracy of 5 × 10-9, which is approximately 10% of its predicted value. Such a measurement will provide a theoretically clean measurement of the weak pion-nucleon coupling, resolving a long-standing controversy in nuclear physics. The experiment will consist of a polarized pulsed cold neutron beam incident on a liquid para-hydrogen target. The 2.2 MeV gammas from the capture reaction will be detected by an array of CsI(Tl) scintillators. A general overview of the experiment and its setup will be given and we will present test results of beam monitors which will be used to monitor the neutron beam spectrum.

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