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Published August 24, 1992 | public
Journal Article Open

Optical model description of parity-nonconserving neutron resonances


We calculate the average helicity dependence of the low-energy neutron-nucleus cross section in terms of a phenomenological optical model. Comparison with recent measurements on 232Th and 238U by the TRIPLE Collaboration shows that the effective parity-nonconserving interaction is two orders of magnitude larger than estimates based on standard meson-exchange models. The helicity dependence is predicted to oscillate with target mass due to shape resonances.

Additional Information

©1992 The American Physical Society. Received 26 March 1992. We are grateful for discussions with G. E. Brown and H. A. Bethe and with other members of the Caltech nuclear theory effort. This work was supported in part by National Science Foundation Grants No. PHY90-13248 and No. PHY91-15574 and by Contract No. DE-F603-88ER-40397 with the U.S. Department of Energy.


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