Neutron optics P-violation effects near p-wave resonance

The observations of large enhancement of parity-violation at p-wave compoun d resonance encourage prompt active discussion of TRI test in neutron optic s. One of the most attractive objects for investigation is the p-wave reson ance of La-139 at energy 0.734 eV for which the strongest P-odd effect of s pin dichroism has been observed. A new technique of neutron spin analysis b ased on optically pumped He-3 spin filter has been applied successfully to measure the complementary effect of P-odd spin rotation near the same p-wav e resonance of La-139. The results obtained are consistent with theory pred ictions. (C) 1999 Published by Elsevier Science B.V. All rights reserved.