Parity Violation in ^232Th Neutron Resonances and Confirmation of the 'Sign Effect'
Abstract
Many examples of parity violation in neutron resonances have been observed in the helicity dependence of the total cross section. The method of analysis treats the compound nucleus as a chaotic system and the parity-violating matrix elements as random variables. A previous study(see Frankle et al., Phys Rev Letter 67), 564 (1991) of ^232Th found seven effects greater than 2.4 σ, calling into question the purely statistical view of the compound nucleus. A remeasurement of ^232Th with improved experimental apparatus as well as analysis methods has recently confirmed previous results with increased precision. New results will be presented.
- Publication:
-
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- October 1997
- Bibcode:
- 1997APS..DNP..HC06S