Abstract
Parity nonconservation (PNC) was studied for 24 p-wave neutron resonances in ${}^{238}\mathrm{U}$ from 10 to 300 eV by measuring the helicity dependence of the total neutron cross section with an improved experimental apparatus. Six resonances show statistically significant (greater than $2.9\ensuremath{\sigma})$ parity violation. An analysis treating the PNC matrix elements as random variables yields a root-mean-square PNC matrix element ${M=0.67}_{\ensuremath{-}0.16}^{+0.24}$ meV. The corresponding weak spreading width ${\ensuremath{\Gamma}}_{w}{=(1.35}_{\ensuremath{-}0.64}^{+0.97})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$ eV.
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