6533b7d0fe1ef96bd125b66f

RESEARCH PRODUCT

Parity non-conservation at the peak of p-resonances in low-energy neutron-nucleus scattering

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Abstract Parity-non-conserving effects at the top of ρ-wave resonances in low-energy neutron-nucleus scattering are revisited in view of recent measurements in 238 U and 232 Th. This is done in the framework of the valence model. A quite simple expression in terms of the strength of the neutron-nucleus parity-non-conserving force is derived for the P ( E p ) asymmetry. The result, which is independent on the nucleus, can usefully be considered as a benchmark for those effects. Comparison of experiment to theory confirms earlier conclusions, namely the expected strength of the neutron-nucleus parity-non-conserving force is much too low to account for observations in this approach, even if the sign is well reproduced. Clues to explain discrepancies with other recent works are given.