Possibilities for Studies of Parity Violation at the SNS Using the Capture Gamma Reaction

Details Possibilities for Studies of Parity Violation at the SNS Using the Capture Gamma Reaction Possibilities for Studies of Parity Violation at the SNS Using the Capture Gamma Reaction

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002asap.conf..202h&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

We have shown that in the standard resonance theory of parity violation in the compound nucleus, the longitudinal parity violating asymmetry in partial neutron capture cross sections is essentially independent of the partial gamma-widths involved. Thus, the same asymmetry is expected for each partial cross section involving the same p-wave resonance. The asymmetries are expected to be enhanced (~ 10%), and asymmetry measurements for several partial capture cross sections from a given p-wave resonance would provide a very strong test of the theory. Measurements of parity violation in the (n,γ) reaction using high efficiency germanium detectors at the SNS could determine the parity-odd nucleon-nucleon matrix elements in complex nuclei with high accuracy and shed light on the origin of the sign problem observed in 232Th. Additionally, simultaneous studies of the E1 and VPNC matrix elements involved in these decays could be used to help constrain the statistical theory of parity non-conservation in compound nuclei. We propose a class of experiments and examine their feasibility.

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