Speaker
Description
One of the most interesting discoveries in the field of nuclear physics made in the 1970s and 1980s was the discovery of spatial parity violation during the fission of nuclei by polarized neutrons. It turned out that the probabilities of the emission of a light fragment along and against the direction of the spin of the initial neutron are different. The asymmetry value is about 10-4. Sushkov O.P. and Flambaum V.V. were the first who theoretically investigated and suggested that experimenters look for P-odd effects in p-wave resonances. In the 1970s, FLNP JINR accumulated extensive experience in working with polarized neutrons and polarized targets. And after the suggestion of Sushkov and Flambaum, experiments were carried out and already in 1981-82, the first results obtained at FLNP JINR on P-odd neutron dichroism in low-lying p-wave resonances were published. And almost immediately - a sensation: in the p-wave resonance with an energy of 0.75 eV of the 139 La nucleus, the effect of P-parity violation turned out to be 7 * 10-2. Over the course of 20 years, similar studies were carried out in several hundred p-wave resonances of various nuclei, but only in one of them did the effect turn out to be slightly higher. And work in this direction has stopped in recent years. In 2017-2018, new publications on this topic were published. At present, there is an opportunity to study correlations at the IREN facility at the FLNP JINR. We have begun measurements to study p-even correlations on Th, In, and Sn nuclei. A prototype of the installation has been created and the first preliminary results will be presented.
