학술논문
Search for neutrinoless quadruple beta decay of 136Xe in XMASS-I
Document Type
article
Author
K. Abe; K. Hiraide; K. Ichimura; N. Kato; Y. Kishimoto; K. Kobayashi; M. Kobayashi; S. Moriyama; M. Nakahata; K. Sato; H. Sekiya; T. Suzuki; A. Takeda; S. Tasaka; M. Yamashita; B.S. Yang; N.Y. Kim; Y.D. Kim; Y.H. Kim; R. Ishii; Y. Itow; K. Kanzawa; K. Masuda; K. Martens; A. Mason; Y. Suzuki; K. Miuchi; Y. Takeuchi; K.B. Lee; M.K. Lee; Y. Fukuda; H. Ogawa; K. Nishijima; K. Fushimi; B.D. Xu; S. Nakamura
Source
Physics Letters B, Vol 833, Iss , Pp 137355- (2022)
Subject
Language
English
ISSN
0370-2693
Abstract
A search for the neutrinoless quadruple beta decay of 136Xe was conducted with the liquid-xenon detector XMASS-I using 327 kg ×800.0 days of the exposure. The pulse shape discrimination based on the scintillation decay time constant which distinguishes γ-rays including the signal and β-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 × 1024 years at 90% confidence level. This is the first experimental constraint of the neutrinoless quadruple beta decay of 136Xe.