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Macolino, C. Szyszka, C. T. Oba Ishikawa, C. Weinheimer, C. Wittweg, D. Ant\\'on Martin, D. Fuchs, D. Koke, D. Ram\\'irez Garc\\'ia, D. Thers, D. Wenz, D. Xu, E. Angelino, E. Aprile, E Kozlova, F. Arneodo, F. Gao, F. Girard, F. Joerg, F. Lombardi, F. Marignetti, F. N. Semler, F. Pompa, F. Semeria, G. Bruni, G. C. Madduri, G. M. Lucchetti, G. Plante, G. Sartorelli, G. Trinchero, G. Volta, G. Zavattini, H. Fischer, H. Guan, H. Landsman, H. Li, H. Schulze Ei{\\ss}ing, H. Simgen, I. Li, I. Sarnoff, J. Aalbers, J. A. M. Lopes, J. Conrad, J. Grigat, J. Jakob, J. J. Cuenca-Garc\\'ia, J. Mahlstedt, J. Masbou, J. Merz, J. M. F. dos Santos, J. M. R. Cardoso, J. M\\\"uller, J. Pienaar, J. Qin, J. Yang, J. Ye, K. Abe, K. Boese, K. Eitel, K. Kooshkjalali, K. Liu, K. Martens, K. Miuchi, K. Ni, K. Otsuzuki, K. Valerius, L. Althueser, L. Baudis, L. Bellagamba, L. C. Daniel Garcia, L. Grandi, L. Hoetzsch, L. Levinson, L. Principe, L. Sanchez, L. Scotto Lavina, L. Yang, L. Yuan, M. Abu Rmeileh, M. Adrover, M. Bazyk, M. Flierman, M. Guida, M. Iacovacci, M. Kara, M. Kobayashi, M. Lindner, M. Liu, M. Messina, M. Murra, M. P. Decowski, M. Pierre, M. Schumann, M. Selvi, M. T. Schiller, M. Weiss, M. Yamashita, M. Yoshida, M. Zhong, N. F. Hood, P. Di Gangi, P. Gyorgy, P. Kharbanda, P.-L. Tan, P. Schulte, P. Shagin, Q. Pellegrini, R. Biondi, R. Budnik, R. Elleboro, R. F. Lang, R. Frankel, R. Giacomobono, R. Glade-Beucke, R. Hammann, R. M. Braun, R. Miyata, R. Peres, R. Singh, S. Ahmed Maouloud, S. Diglio, S. el Morabit, S. Kazama, S. Li, S. Liang, S. Lindemann, S. Mastroianni, S. Moriyama, S. Ouahada, S. R. Armbruster, S. Shi, S. Vecchi, S. Vetter, T. Flehmke, T. Luce, T. Marrod\\'an Undagoitia, T. R. Pollmann, T. Zhu, U. Oberlack, V. Beligotti, V. D'Andrea, V. H. S. Wu, V. Mazza, W. Fulgione, X. Shen, Y. Itow, Y. Kaminaga, Y. Ma, Y. Pan, Y. Takeuchi, Y.-T. Lin, Y. Xing, Y. Zhao, Z. Liang, Z. Song, Z. Xu","submitted_at":"2026-06-16T13:36:03Z","abstract_excerpt":"We present precision measurements of $^{212}\\mathrm{Pb}$ and $^{214}\\mathrm{Pb}$ $\\beta$ decay branching ratios using $^{220}\\mathrm{Rn}$ and $^{222}\\mathrm{Rn}$ calibration data from the XENONnT detector, a dual-phase liquid xenon time projection chamber. Characterizing these isotopes is critical, as they lead to significant low-energy backgrounds in rare-event searches. 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Bismark, A. Deisting, A. D. Ferella, A. Elykov, A. Kopec, A. Li, A. Michel, A. Molinario, A. P. Cimental Ch\\'avez, A. P. Colijn, A. Prajapati, A. Ravindran, A. Razeto, A. Stevens, A. Takeda, B. Andrieu, B. Paetsch, B. von Krosigk, C. Cai, C. Capelli, C. Di Donato, C. D. Tunnell, C. Ferrari, C. Fuselli, C. Hils, C. Macolino, C. Szyszka, C. T. Oba Ishikawa, C. Weinheimer, C. Wittweg, D. Ant\\'on Martin, D. Fuchs, D. Koke, D. Ram\\'irez Garc\\'ia, D. Thers, D. Wenz, D. Xu, E. Angelino, E. Aprile, E Kozlova, F. Arneodo, F. Gao, F. Girard, F. Joerg, F. Lombardi, F. Marignetti, F. N. Semler, F. Pompa, F. Semeria, G. Bruni, G. C. Madduri, G. M. Lucchetti, G. Plante, G. Sartorelli, G. Trinchero, G. Volta, G. Zavattini, H. Fischer, H. Guan, H. Landsman, H. Li, H. Schulze Ei{\\ss}ing, H. Simgen, I. Li, I. Sarnoff, J. Aalbers, J. A. M. Lopes, J. Conrad, J. Grigat, J. Jakob, J. J. Cuenca-Garc\\'ia, J. Mahlstedt, J. Masbou, J. Merz, J. M. F. dos Santos, J. M. R. Cardoso, J. M\\\"uller, J. Pienaar, J. Qin, J. Yang, J. Ye, K. Abe, K. Boese, K. Eitel, K. Kooshkjalali, K. Liu, K. Martens, K. Miuchi, K. Ni, K. Otsuzuki, K. Valerius, L. Althueser, L. Baudis, L. Bellagamba, L. C. Daniel Garcia, L. Grandi, L. Hoetzsch, L. Levinson, L. Principe, L. Sanchez, L. Scotto Lavina, L. Yang, L. Yuan, M. Abu Rmeileh, M. Adrover, M. Bazyk, M. Flierman, M. Guida, M. Iacovacci, M. Kara, M. Kobayashi, M. Lindner, M. Liu, M. Messina, M. Murra, M. P. Decowski, M. Pierre, M. Schumann, M. Selvi, M. T. Schiller, M. Weiss, M. Yamashita, M. Yoshida, M. Zhong, N. F. Hood, P. Di Gangi, P. Gyorgy, P. Kharbanda, P.-L. Tan, P. Schulte, P. Shagin, Q. Pellegrini, R. Biondi, R. Budnik, R. Elleboro, R. F. Lang, R. Frankel, R. Giacomobono, R. Glade-Beucke, R. Hammann, R. M. Braun, R. Miyata, R. Peres, R. Singh, S. Ahmed Maouloud, S. Diglio, S. el Morabit, S. Kazama, S. Li, S. Liang, S. Lindemann, S. Mastroianni, S. Moriyama, S. Ouahada, S. R. Armbruster, S. Shi, S. Vecchi, S. Vetter, T. Flehmke, T. Luce, T. Marrod\\'an Undagoitia, T. R. Pollmann, T. Zhu, U. Oberlack, V. Beligotti, V. D'Andrea, V. H. S. Wu, V. Mazza, W. Fulgione, X. Shen, Y. Itow, Y. Kaminaga, Y. Ma, Y. Pan, Y. Takeuchi, Y.-T. Lin, Y. Xing, Y. Zhao, Z. Liang, Z. Song, Z. Xu","submitted_at":"2026-06-16T13:36:03Z","abstract_excerpt":"We present precision measurements of $^{212}\\mathrm{Pb}$ and $^{214}\\mathrm{Pb}$ $\\beta$ decay branching ratios using $^{220}\\mathrm{Rn}$ and $^{222}\\mathrm{Rn}$ calibration data from the XENONnT detector, a dual-phase liquid xenon time projection chamber. Characterizing these isotopes is critical, as they lead to significant low-energy backgrounds in rare-event searches. 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