Search for Time-Reversal Invariance Violation with High Intensity Neutron Beam

The important advantage to the search for Time-Reversal invariance violation (TRIV) in neutron nuclei interactions is the possibility of an enhancement of T-violating observables by many orders of magnitude due to the complex nuclear structure (see, i.e. paper [1] and references therein). Moreover, the variety of nuclear systems to measure T-violating parameters provides assurance that a possible “accidental” cancelation of T-violating effects due to unknown structural factors related to the strong interactions in the particular system would be avoided. Taking into account that different models of the CP-violation may contribute differently to a particular T/CP-observable, which may have unknown theoretical uncertainties, TRIV nuclear effects could be considered valuable complementary experiments to electric dipole moment (EDM) measurements. One of the promising approaches to the search of TRIV in nuclear reactions is the measurement of TRIV effects in a transmission of polarized neutrons through a polarized target. For the observation of TRIV and parity violating (PV) effects, one can consider effects related to the σ⃗n · (p⃗ × I⃗) correlation, where σ⃗n is the neutron spin, I⃗ is the target spin, and p⃗ is the neutron momentum, which can be observed in the transmission of polarized neutrons through a target with a polarized nuclei. This correlation leads to a difference between the total neutron cross sections ∆σ̸T ̸P for σ⃗n parallel and anti-parallel to p⃗× I⃗ and to neutron spin rotation angle φ̸T ̸P around the axis p⃗× I⃗