Measurement of γ rays from 6LiF tile as an inner wall of a neutron-decay detector. (1st February 2021) - Koga, J.; Ieki, S.; Kimura, A.; Kitaguchi, M.; Kitahara, R.; Mishima, K.; Nagakura, N.; Okudaira, T.; Otono, H.; Shimizu, H.M.; Sumi, N.; Takada, S.; et al.