PAPER / ARXIV:2609.10048
PandaX Collaboration : Zhiyuan Li , Peiyuan Chen , Wei Chen , Xiaohua Chen , Xun Chen , Yunhua Chen , Chen Cheng , Xiangyi Cui , Yuxin Cui , Manna Deng , Roni Dey , Yingjie Fan , Deqing Fang , Xuanye Fu , Zhixing Gao , Yujie Ge , Lisheng Geng , Xunan Guo , Xuyuan Guo , Zichao Guo , Chencheng Han , Ke Han , Changda He , Jinrong He , Ruquan Hou , Houqi Huang , Junting Huang , Yule Huang , Xiangdong Ji , Yonglin Ju , Xiaorun Lan , Chenxiang Li , Mingchuan Li , Peiyuan Li , Shuaijie Li , Tao Li , Yangdong Li , Yuan Li , Qing Lin , Jianglai Liu , Yuanchun Liu , Yunyang Luo , Yugang Ma , Yajun Mao , Yue Meng , Binyu Pang , Ningchun Qi , Xiangxiang Ren , Dong Shan , Xiyuan Shao , Manbin Shen , Xuyan Sun , Yi Tao , Yueqiang Tian , Yuxin Tian , Anqing Wang , Guanbo Wang , Hao Wang , Haoyu Wang , Jiamin Wang , Lei Wang , Meng Wang , Qiuhong Wang , Shaobo Wang , Shibo Wang , Siguang Wang , Wei Wang , Xu Wang , Zhou Wang , Yuehuan Wei , Weihao Wu , Yuan Wu , Mengjiao Xiao , Xiang Xiao , Yuhan Xie , Kaizhi Xiong , Jianqin Xu , Yifan Xu , Binbin Yan , Xiyu Yan , Yong Yang , Shunyu Yao , Peihua Ye , Chunxu Yu , Zhe Yuan , Youhui Yun , Minzhen Zhang , Peng Zhang , Shibo Zhang , Shu Zhang , Siyuan Zhang , Tao Zhang , Wei Zhang , Yang Zhang , Yingxin Zhang , Yuanyuan Zhang , Kangkang Zhao , Li Zhao , Jiaxu Zhou
RESUMO
The observation of neutrinoless quadruple beta decay (0$\nu$4$\beta$) in the absence of neutrinoless double beta decay (0$\nu$2$\beta$) has been argued to provide a strong indication that neutrinos are Dirac particles. We report a search for 0$\nu$4$\beta$ decay of $^{136}\text{Xe}$ using a total $^{136}\text{Xe}$ exposure of 148.4 kg$\cdot$yr, collected during the commissioning and the first science runs of the PandaX-4T experiment. No significant excess of events over the background is observed. A lower limit on the 0$\nu$4$\beta$ decay half-life of $^{136}\text{Xe}$ is set at 6.01 x $10^{24}$ yr at the 90% confidence level. This result establishes the most stringent constraint on this process in xenon, demonstrating the unique capability of the PandaX-4T detector in probing lepton number violation and shedding light on the fundamental nature of neutrinos.
NO MESMO MAPA