Objective
The project is devoted to study of fundamental symmetry of neutron induced reactions in respect of space reflection (PI) and time reversal invariance (TRI).
TRI-violation is one of the most urgent and interesting problem of physics. This phenomenon was discovered more than 30 years ago, but no additional experimental evidence was obtained. Now, in relation to the observation of large enhancement of PI-violation at p-wave compound resonances, there has arisen an active discussion of TRI test in neutron optics. One of the most attractive object for investigation is the p-wave resonance of 139-La at energy 0.734 eV. Large enhancement of PI-violation at p-wave resonance has stimulated several scientific groups in Russia, Japan and USA to carry out experiments searching for helicity dependence of neutron cross section. All of them used high-flux pulsed neutron sources and polarized proton filter to produce the beam of polarized neutrons. This technique, being very successful in study of PI-violating dichroism, meets difficulties in the attempts to search for PI-violating rotation and moreover to search for TRI-violation effects.
Recently the scientific group from PNPI (Gatchina, Russia) in the experiment searching for PI-violating spin rotation in p-wave resonance of 139-La used the stationary nuclear reactor WWR-M and crystal-diffraction technique. The results obtained demonstrate good potentialities of the technique used to study PI- and TRI-violation effects.
The main goal of the project is using the advance of high- flux reactor with "hot source" and crystal-diffraction technique to realize the following program of experimental study at p-wave resonance of 139-La, 117-Sn :
Precise measurements of neutron-optical PI-violating effects of P-odd spin dichroism and P-odd spin rotation.
Measurement of P-odd left-right asymmetry of gamma-ray angular distribution.
Measurement P-odd asymmetry of gamma-ray angular distribution.
As a result it will be possible to test the modern theory of P-odd and TRI-violation effects in interaction of slow neutrons with complex nuclei by the comprehensive analysis of different phenomena at the same p-wave resonance.
The results of research study will be presented to a wide scientific public by the publication in the domestic and international scientific periodic editions, by the reports of international conferences, meetings and schools.
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38042 Grenoble
France