EPJ Web Conf.
Volume 219, 2019International Workshop on Particle Physics at Neutron Sources (PPNS 2018)
|Number of page(s)||4|
|Section||Searches for Time-Reversal-Violation in Nuclei|
|Published online||13 December 2019|
Measurement of P-Violation in 139La(n,γ)140La – a first step towards a T-Violation search
1 Department of Physics, Nagoya University, Furocho, Chikusa, Nagoya, Aichi 464–8601, Japan
2 Kobayashi-Maskawa Institute, Nagoya University, Furocho, Chikusa, Nagoya, Aichi 464–8601, Japan
3 Department of Physics, Kyushu University, 744 Motooka, Nishi, Fukuoka, Fukuoka 819–0395, Japan
4 Research Center of Advanced Particle Physics, Kyushu University, 744 Motooka, Nishi, Fukuoka, Fukuoka 819–0395, Japan
5 Institute of Material Structure Science, High Energy Accelerator Organization (KEK), Oho 1–1, Tsukuba, Ibaraki 305–0801, Japan
6 Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152–8551, Japan
7 University of British Columbia, Vancouver, British Columbia V6R1Z1, Canada
8 Yamagata University, 1-41-2 Koshirakawa, Yamagata 990–8560, Japan
9 Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, Japan
10 Research Reactor Institute, Kyoto University, Kumatori, Osaka 590–0494, Japan
11 Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
12 RIKEN, 2–1 Hirosawa, Wako, Saitama 351–0198, Japan
Published online: 13 December 2019
We performed a polarized neutron transmission asymmetry measurement utilizing the 139La(n,γ)140La reaction. This measurement involved the use of a recently developed 3He spin filter mounted on the J-PARC MLF beam line number 4 (BL04). The resulting value of the longitudinal asymmetry AL = (11.7 ± 1.1)% was found to be in good agreement with existing values in the literature suggesting that the method by which we polarize the neutron beam is not a significant source of uncertainty. This preliminary work represents a first step toward future measurements of the angular correlation in (n̅,Υ) reactions necessary in the search for enhanced T-Violation in compound nuclei.
© The Authors, published by EDP Sciences, 2019
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