16–21 Oct 2022
PSI
Europe/Zurich timezone

Current Status for the search of time-reversal symmetry violation using compound nuclear reactions

18 Oct 2022, 16:15
1m
WHGA / Foyer and Tent (PSI)

WHGA / Foyer and Tent

PSI

Speaker

Mr Shunsuke Endo (Japan Atomic Energy Agency)

Description

The large enhancement of parity-violation of the weak interaction was found in nuclear reactions for several nuclei [1]. The enhancement is explained as the mixing of parity-unfavored partial amplitudes in the entrance channel of the compound sates, s-p mixing [2]. It is proposed that the time-reversal symmetry violation is also enhanced in compound nuclei by the same mechanism [3]. We are preparing the time-reversal violation search based on this new approach.
The time-reversal violation can be obtained by measuring the neutron spin behavior in compound nuclei using polarized neutron beam and polarized nuclear target. In parallel with the development of these instruments, we conduct precise measurements of compound nuclear reactions in J-PARC MLF. The enhancement factor of time-reversal violation can be estimated by measuring the angular correlation terms of (n,$\gamma$) reactions according to the s-p mixing theory. We have measured the several correlation terms for several nuclei, such as $^{139}$La, $^{117}$Sn, and $^{131}$Xe, which are candidates of the target nuclei in the time-reversal violation search. Furthermore, we have already started the experiments with the polarized neutron beam and the polarized target. In this presentation, we will introduce the current status of the preparation for the search of time-reversal violation.

[1] G. E. Mitchell et al., Phys. Rep. 354, 157 (2001).
[2] V. P. Gudkov, Phys. Rep. 212, 77 (1992).
[3] V. V. Flambaum and O. P. Sushkov, Nucl. Phys. A 435, 352 (1985).

Primary author

Mr Shunsuke Endo (Japan Atomic Energy Agency)

Co-authors

Dr Atsushi Kimura (Japan Atomic Energy Agency) Prof. Hirohiko Shimizu (Nagoya University) Mr Hiromoto Yoshikawa (Osaka University) Dr Hiroyuki Fujioka (Tokyo Institute of Technology) Mr Ikuo Ide (Nagoya University) Dr Kenji Sakai (Japan Atomic Energy Agency) Mr Kento Kameda (Tokyo Institute of Technology) Prof. Masaaki Kitaguchi (Nagoya University) Prof. Masataka Iinuma (Hiroshima University) Mr Rintaro Nakabe (Nagoya University) Ms Shiori Kawamura (Nagoya University) Dr Shusuke Takada (Tohoku University) Dr Takayuki Oku (Japan Atomic Energy Agency) Dr Takuya Okudaira (Nagoya University) Prof. Tamaki Yoshioka (Kyushu University) Prof. Tatsushi Shima (Osaka University) Mr Yuki Ito (Nagoya University) collaboration NOPTREX

Presentation materials