Time-Reversal Analysis of Neutron Optics Components in the NOPTREX ExperimentHajer Dhahri, NOPTREX Collaboration*

By the CPT theorem, the search for new sources of time reversal ($T$) violation in particle interactions is crucial to our understanding of charge-parity ($CP$) violation, which is required to explain the matter-antimatter asymmetry of the universe. The aim of the Neutron Optics Time Reversal Experiment (NOPTREX) is to search for $T$-violation in the transmission of polarized neutrons through polarized heavy nuclear targets such as $^{139}$La,  which have large measured parity-violating resonances in neutron transmission. The development of quantum mechanical time evolution operators for each individual component of our apparatus is particularly critical for analysis of our experimental sensitivity to time-odd observables, and elimination of systematic errors through the Time Reversal Invariance Violation transmission theorem\cite{Bowman}. We will focus our discussion on the calculations of time evolution operators, including propagation through a magnetic field of the spin flipper, which we mapped at FP12, LANSCE.

\bibitem{Bowman}, Bowman, Gudkov, Phys. Rev. C. {\bf 90}, 065503 (2014).