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Parity nonconservation for neutron resonances inTh232

Physical Review C1992Vol. 46(2), pp. 778–787

Citations Over TimeTop 10% of 1992 papers

C. M. Frankle, J. D. Bowman, J. E. Bush, P. P. J. Delheij, C. R. Gould, D. G. Haase, J. N. Knudson, G. E. Mitchell, S. Penttilä, H. Postma, N. R. Roberson, S. J. Seestrom, J. Szymański, Saeahram Yoo, V. W. Yuan, X. Zhu

Abstract

Parity nonconserving (PNC) longitudinal analyzing powers were measured for 23 p-wave neutron resonances in $^{232}\mathrm{Th}$. Seven resonances show effects of greater than 2.4\ensuremath{\sigma} statistical significance---the largest sample yet measured in a single nucleus. All seven analyzing powers have positive sign. Strong sign correlations are not a feature of the conventional statistical model of parity mixing between compound nuclear states. The asymmetry was expressed as a sum of two terms: a constant asymmetry and a fluctuating asymmetry. With this ansatz the root-mean-square PNC matrix element M=1.${2}_{\mathrm{\ensuremath{-}}0.4}^{+0.5}$ meV, which corresponds to a spreading width of ${\mathrm{\ensuremath{\Gamma}}}^{\mathrm{PV}}$=6\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}7}$ eV.

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