Search for Parity Violation in 93Nb Neutron Resonances
Copyright held by American Physical Society. First published as EI Sharapox et al, Search for Parity Violation in 93Nb Neutron Resonances, Physical Review C, 59:2, 1131-1135, doi: 10.1103/PhysRevC.59.1131.
A new search has been performed for parity violation in the compound nuclear states of 94Nb by measuring the helicity dependence of the neutron total cross section. Transmission measurements on a thick niobium target were performed by the time-of-flight method at the Manuel Lujan Neutron Scattering Center with a longitudinally polarized neutron beam in the energy range 32 to 1000 eV. A total of 18 p-wave resonances in 93Nb were studied with none exhibiting a statistically significant parity-violating longitudinal asymmetry. An upper limit of 1.0×10-7 eV (95% confidence level) was obtained for the weak spreading widthΓw in 93Nb.