Parity nonconservation (PNC) was studied in p-wave resonances in indium by measuring the helicity dependence of the neutron total cross section in the neutron energy range 6.0–316 eV with the time-of-flight method at LANSCE. A total of 36 p-wave neutron resonances were studied in 115In, and statistically significant asymmetries were observed for nine cases. An analysis treating the PNC matrix elements as random variables yields a weak matrix element of M=(0.67-0.12+0.16) meV and a weak spreading width of Γw=(1.30-0.43+0.76)×10-7 eV.
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Stephenson, S., Bowman, J. D., Corvi, J., Crawford, B. E., Delheij, P. P. J., Frankle, C. M., IInuma, M., Knudsen, J. N., Lowie, L. Y., Masaike, A., Masuda, Y., Matsuda, Y., Mitchell, G. E., Penttila, S. I., Postma, H., Roberson, N. R., Seestrom, S. J., Sharapov, E. I., Shimizu, H. M., Yen, Y-F., Yuan, V. W., & Zanini, L. (2000). Parity Violation in Neutron Resonances in 115In. Physical Review C, 61(045501). http://dx.doi.org/10.1103/PhysRevC.61.045501
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Copyright held by American Physical Society. First published as SL Stephenson et al, Parity Violation in Neutron Resonances in 115In, Physical Review C, 61, 045501, doi: 10.1103/PhysRevC.61.045501.