Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apri13001m&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. Precise detector alignment is required to prevent mixing of undesired parity-conserving transverse asymmetries with the extracted A_γ signal. A scheme for alignment of the detector array was tested in a neutron beam in Fall 2001.
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