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.
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Sharapov, E. I., Bowman, J. D., Crawford, B. E., Delheij, P. P. J., Frankle, C. M., Fukuda, K., IInuma, M., Knudsen, J. N., Lokitz, J., Lowie, L. Y., Masaike, A., Masuda, Y., Matsuda, Y., Mitchell, G.,E., Penttila, S. I., Postma, H., Roberson, N. R., Seestrom, S. J., Shimizu, H. M., Stephenson, S., Yen, Y.-F., &Yuan, V. W. (1999). Search for Parity Violation in 93Nb Neutron Resonances. Physical Review C, 59(2), 1131-1135. http://dx.doi.org/10.1103/PhysRevC.59.1131
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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.