Experimental study for the sensitivity of T-violation search in the compound nuclear reaction of ¹¹⁷Sn

CP-violation is necessary to explain the dominance of matter over antimatter in the current universe. To explain this, it is suggested that there is CP-violation in beyond the standard model. In the several compound nuclear reactions, P-violation is enhanced by a factor of 10⁶ compared to the proton-proton scattering. This enhancement mechanism is theoretically explained as the interference between p- and s-wave resonances. It is theoretically suggested that CP-violation could be also enhanced by this mechanism. Considering the CPT theorem, it implies that T-violation could be enhanced. This theory predicts that the value of amplification factor for T-violation depends on nuclear species. The experiments to select the candidate nuclei for T-violation search are carried out at J-PARC. To determine the value of amplification factor of ¹¹⁷Sn, we measured the angular distribution of prompt gamma-rays emitted from compound states of Sn. Based on this result, we will discuss the experimental sensitivity of ¹¹⁷Sn for T-violation search.