Optical-model analysis of parity-nonconserving neutron scattering at epithermal energies
- Instituto de Estudos Avancados, Centro Tecnico Aeroespacial, 12225 Sao Jose dos Campos, Sao Paulo (Brazil)
- Center for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
The parity nonconserving (PNC) resonant scattering of neutrons at epithermal energies is discussed within the optical model. We show that the empirical optical-model potential with real PNC interaction does not account for the appreciable resonance-averaged difference between positive and negative helicity total {ital p}-neutron cross sections {l_angle}{Delta}{sigma}{r_angle} for {sup 232}Th, but reproduces the very small {l_angle}{Delta}{sigma}{r_angle} for {sup 238}U. It is suggested that the 2{ital p}-1{ital h} local doorway, previously proposed to account for the sign correlation in {sup 232}Th, is the main source for the large {l_angle}{Delta}{sigma}{r_angle} seen in this system. It is further proposed that if an optical potential is used to account for {l_angle}{Delta}{sigma}{r_angle}, a {ital complex} PNC interaction is required in cases involving strong sign correlation.
- DOE Contract Number:
- FC02-94ER40818
- OSTI ID:
- 82203
- Journal Information:
- Physical Review, C, Vol. 52, Issue 1; Other Information: PBD: Jul 1995
- Country of Publication:
- United States
- Language:
- English
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