1. Parity nonconservation in neutron resonances in238U
- Author
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TRIPLE Collaboration, Crawford, B. E., Bowman, J. D., Delheij, P. P. J., Frankle, C. M., Iinuma, Masataka, Knudson, J. N., Lowie, L. Y., Masaike, Akira, Matsuda, Yasuyuki, Mitchell, G. E., Penttilä, S. I., Postma, H., Roberson, N. R., Seestrom, S. J., Sharapov, E. I., Stephenson, S. L., Yen, Y.-F., and Yuan, V. W.
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Uranium-238 ,Total neutron ,Neutron ,Matrix element ,Parity (physics) ,Symmetry breaking ,Random variable ,Helicity - 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.
- Published
- 1998
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