Y. Gando^1,2, S. Goto¹, T. Hachiya¹, K. Hata¹, K. Ichimura¹, S. Ieki¹, H. Ikeda¹, K. Inoue¹, K. Ishidoshiro¹, Y. Kamei^1,†, N. Kawada¹, Y. Kishimoto¹, M. Koga^1,3, A. Marthe¹, Y. Matsumoto¹, T. Mitsui^1,‡, H. Miyake^1,4, D. Morita¹, R. Nakajima¹, K. Nakamura^1,§, R. Nakamura¹, R. Nakamura¹, J. Nakane¹, T. Ono¹, H. Ozaki¹, K. Saito¹, T. Sakai¹, I. Shimizu¹, J. Shirai¹, K. Shiraishi¹, A. Suzuki¹, K. Tachibana¹, K. Tamae¹, H. Watanabe¹, K. Watanabe¹, S. Yoshida⁵, S. Umehara⁶, K. Fushimi⁷, K. Kotera⁸, Y. Urano^8,∥, B. E. Berger⁹, B. K. Fujikawa^3,9, J. G. Learned¹⁰, J. Maricic¹⁰, Z. Fu¹¹, S. Ghosh¹¹, J. Smolsky¹¹, L. A. Winslow¹¹, Y. Efremenko^3,12, H. J. Karwowski¹³, D. M. Markoff¹³, W. Tornow^3,13, S. Dell’Oro¹⁴, T. O’Donnell¹⁴, J. A. Detwiler^3,15, S. Enomoto^3,15, M. P. Decowski¹⁶, K. M. Weerman¹⁶, C. Grant¹⁷, Ö. Penek¹⁷, H. Song¹⁷, A. Li¹⁸, S. N. Axani¹⁹, M. Garcia¹⁹, and M. Sarfraz¹⁹ (KamLAND-Zen Collaboration)

• ¹Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
• ²Department of Human Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan
• ³Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
• ⁴Graduate Program on Physics for the Universe, Tohoku University, Sendai 980-8578, Japan
• ⁵Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
• ⁶Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
• ⁷Department of Physics, Tokushima University, Tokushima 770-8506, Japan
• ⁸Graduate School of Integrated Arts and Sciences, Tokushima University, Tokushima 770-8502, Japan
• ⁹Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
• ¹⁰Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
• ¹¹Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
• ¹²Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
• ¹³Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
• ¹⁴Center for Neutrino Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
• ¹⁵Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
• ¹⁶Nikhef and the University of Amsterdam, Science Park, Amsterdam, the Netherlands
• ¹⁷Boston University, Boston, Massachusetts 02215, USA
• ¹⁸Hal𝚤c𝚤oğlu Data Science Institute, Department of Physics, University of California San Diego, La Jolla, California, 92093, USA
• ¹⁹Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA

• ^*Present address: Kamioka Observatory, Institute for Cosmic-Ray Research, The University of Tokyo, Hida, Gifu 506-1205, Japan.
• ^†Present address: Center for Advanced Photonics, RIKEN, Wako, Saitama, 351-0198, Japan.
• ^‡Present address: Faculty of Health Sciences, Butsuryo College of Osaka, Sakai, Osaka 593-8328, Japan.
• ^§Also at Faculty of Environmental and Urban Engineering, Kansai University, Suita, Osaka 564-8680, Japan.
• ^∥Present address: Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan.