Parity violation in neutron resonances in 115In

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 In-115, 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 Gamma(w) = (1.30(-0.43)(+0.76)) x 10(-7) eV.