Abstract
Parity violation in slow neutron-nucleus scattering, particularly for the coherent spin rotation effect φ and the helicity dependence of the total cross section Δσ, is analyzed in general terms. The need for exothermic reactions for Δσ to exist at low energy is emphasized and a multichannel scattering method is indicated and used to study the question of threshold behavior. The threshold law Δσ ∼ const. is found, in addition to φ ∼ const. A method for treating nuclear resonances is given. An interesting time-reversal test with polarized targets is suggested. Non-forward scattering parity-violating effects are found to be small. The recent experimental findings of large values for φ and Δσ are discussed.
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