학술논문
Search for neutrinoless quadruple beta decay of $^{136}$Xe in XMASS-I
Document Type
Working Paper
Author
XMASS Collaboration; Abe, K.; Hiraide, K.; Ichimura, K.; Kato, N.; Kishimoto, Y.; Kobayashi, K.; Kobayashi, M.; Moriyama, S.; Nakahata, M.; Sato, K.; Sekiya, H.; Suzuki, T.; Takeda, A.; Tasaka, S.; Yamashita, M.; Yang, B. S.; Kim, N. Y.; Kim, Y. D.; Kim, Y. H.; Ishii, R.; Itow, Y.; Kanzawa, K.; Masuda, K.; Martens, K.; Mason, A.; Suzuki, Y.; Miuchi, K.; Takeuchi, Y.; Lee, K. B.; Lee, M. K.; Fukuda, Y.; Ogawa, H.; Nishijima, K.; Fushimi, K.; Xu, B. D.; Nakamura, S.
Source
Physics Letters B 833 (2022) 137355
Subject
Language
Abstract
A search for the neutrinoless quadruple beta decay of $^{136}$Xe was conducted with the liquid-xenon detector XMASS-I using $\rm 327\; kg \times 800.0 \; days$ of the exposure. The pulse shape discrimination based on the scintillation decay time constant which distinguishes $\gamma$-rays including the signal and $\beta$-rays was used to enhance the search sensitivity. No significant signal excess was observed from the energy spectrum fitting with precise background evaluation, and we set a lower limit of the half life of 3.7 $\times$ 10$^{24}$ years at 90$\%$ confidence level. This is the first experimental constraint of the neutrinoless quadruple beta decay of $^{136}$Xe.