Potential to identify neutrino mass ordering with reactor antineutrinos at JUNO*
A. C. Abusleme Hoffman, Thomas Adam, S. Ahmad, Rizwan Ahmed, S. Aiello, Muhammad Akram, Abid Aleem, Fengpeng 丰鹏 An 安, Qi 琪 An 安, Giuseppe Andronico, Н. Анфимов, V. Antonelli, Tatiana Antoshkina, Burin Asavapibhop, J. P. A. M. de André, Didier Auguste, Weidong 伟东 Bai 白, Nikita Balashov, W. Baldini, Andrea Barresi, D. Basilico, E. Baussan, Marco Bellato, Marco Beretta, Antonio Bergnoli, D. Bick, Lukas Bieger, S. Biktemerova, Thilo Birkenfeld, I. Morton-Blake, David Blum, S.C. Blyth, Anastasia Bolshakova, Mathieu Bongrand, Clément Bordereau, D. Breton, A. Brigatti, R. Brugnera, Riccardo Bruno, A. Budano, José Busto, J. Busenitz, Barbara Caccianiga, Hao 浩 Cai 蔡, Xiao 啸 Cai 蔡, Yanke Cai, Zhiyan 志岩 Cai 蔡, S. Callier, Antonio Cammi, Agustín Campeny, Chuanya Cao, Guofu 国富 Cao 曹, Jun 俊 Cao 曹, R. Caruso, C. Cerna, Vanessa Cerrone, Chi Kuen Chan, Jinfan 劲帆 Chang 常, Yun 昀 Chang 张, Auttakit Chatrabhuti, Chao 超 Chen 陈, Guoming 国明 Chen 陈, Pingping 平平 Chen 陈, Shaomin 少敏 Chen 陈, Yixue 义学 Chen 陈, Yu 羽 Chen 陈, Zhangming Chen, Zhiyuan 志源 Chen 陈, Zikang 梓康 Chen 陈, Jie 捷 Cheng 程, Yaping 雅苹 Cheng 程, Yu Chin 宇晉 Cheng 鄭, Alexander Chepurnov, Alexey Chetverikov, Davide Chiesa, P. Chimenti, Yen-Ting Chin, Ziliang Chu, A. Chukanov, Gérard Claverie, Catia Clementi, B. Clerbaux, Marta Colomer Molla, Selma Conforti DiLorenzo, Alberto Coppi, Daniele Corti, Simon Csakli, Flavio Dal Corso, Olivia Dalager, Jaydeep Datta, C. De La Taille, Zhi 智 Deng 邓, Ziyan 子艳 Deng 邓, Xiaoyu 晓宇 Ding 杨, Xuefeng 雪峰 Ding 丁, Yayun 雅韵 Ding 丁, Bayu Dirgantara, Carsten Dittrich, Sergey Dmitrievsky, Tadeáš Dohnal
Abstract
Abstract The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose neutrino experiment under construction in South China. This paper presents an updated estimate of JUNO’s sensitivity to neutrino mass ordering using the reactor antineutrinos emitted from eight nuclear reactor cores in the Taishan and Yangjiang nuclear power plants. This measurement is planned by studying the fine interference pattern caused by quasi-vacuum oscillations in the oscillated antineutrino spectrum at a baseline of 52.5 km and is completely independent of the CP violating phase and neutrino mixing angle θ 23 . The sensitivity is obtained through a joint analysis of JUNO and Taishan Antineutrino Observatory (TAO) detectors utilizing the best available knowledge to date about the location and overburden of the JUNO experimental site, local and global nuclear reactors, JUNO and TAO detector responses, expected event rates and spectra of signals and backgrounds, and systematic uncertainties of analysis inputs. We find that a 3 σ median sensitivity to reject the wrong mass ordering hypothesis can be reached with an exposure of about 6.5 years × 26.6 GW thermal power.