Abstract
Parity nonconservation (PNC) was studied for 16 p-wave resonances in $^{238}\mathrm{U}$ by measuring the helicity dependence of the total cross section for epithermal neutrons scattered from $^{238}\mathrm{U}$. A statistical analysis yields a root-mean-square PNC matrix element M=0.${56}_{\mathrm{\ensuremath{-}}0.20}^{+0.41}$ meV, which corresponds to a spreading width of ${\mathrm{\ensuremath{\Gamma}}}^{\mathrm{PV}}$=0.9\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}7}$ eV. Under plausible assumptions this gives a value of 4\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}7}$ for \ensuremath{\Vert}${\mathrm{\ensuremath{\alpha}}}_{\mathit{p}}$\ensuremath{\Vert}, the ratio of strengths of the P-odd and P-even effective nucleon-nucleon interactions.
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