Author: Jonathan Curole

Publisher:

Published: 2023

Total Pages: 0

ISBN-13:

The search for new sources of time reversal violation (TRV) is one of the highest intellectual priorities in nuclear/particle/astrophysics. New sources of CP/T violation beyond the Standard Model are needed to explain the observed matter-antimatter asymmetry of the universe. Theoretical progress to identify the large number of possible sources for TRV has made it very clear that any single type of TRV search cannot be equally sensitive to all possible mechanisms. It is therefore essential to pursue any experiments in different systems which can be realized with sufficient sensitivity to discover something new. Since TRV in the nucleon sector has not yet been observed, a nonzero observation in any nuclear system is of fundamental importance. TRV experiments involving p-wave neutron resonances in heavy nuclei are a sensitive system for such a search. The international collaboration NOPTREX proposes a TRV search through an asymmetry in polarized neutron transmission on epithermal p-wave resonances of polarized nuclei. Multiple papers have suggested that TRV in complex nuclei has the potential to be about 2 orders of magnitude more sensitive than the current limit from neutron electric dipole moment (EDM) experiments. A sensitive search for TRV in this process expands the variety of nuclear systems available to search for TRV parameters in various theories. This helps provide assurance that possible "accidental" cancellation of TRV effects due to unknown structural factors related to the strong interactions in particular systems can be avoided.