Abstract

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 ${}^{115}\mathrm{In},$ 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 ${M=(0.67}_{\ensuremath{-}0.12}^{+0.16}) \mathrm{meV}$ and a weak spreading width of ${\ensuremath{\Gamma}}_{w}{=(1.30}_{\ensuremath{-}0.43}^{+0.76})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7} \mathrm{eV}.$

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