Parity violation at the 0.75-eV neutron resonance of lanthanum-139
Alfimenkov V. P. , Borzakov S. B., Vo Van Tkhuan, Mareev Yu. D. , Pikel'ner L. B. , Khrykin A. S., Sharapov E. I.
A parity violation at the 0.75-eV neutron resonance of lanthanum-139 has been observed in an experiment on the transmission of polarized resonance neutrons. The change in the cross section upon a change in the neutron helicity is P{Ep) = (σ+ σ~)/(σ + + σ~) = (7.3±0.5)X 10'2.