Material radiopurity control in the XENONnT experiment
Creators: name: Aprile, E.
name: Abe, K.
name: Agostini, F.
name: Maouloud, S. Ahmed
name: Alfonsi, M.
name: Althueser, L.
name: Angelino, E.
name: Angevaare, J. R.
name: Antochi, V. C.
name: Martin, D. Antón
name: Arneodo, F.
name: Baudis, L.
name: Baxter, A. L.
name: Bellagamba, L.
name: Biondi, R.
name: Bismark, A.
name: Brown, A.
name: Bruenner, S.
name: Bruno, G.
name: Budnik, R.
name: Capelli, C.
name: Cardoso, J. M. R.
name: Cichon, D.
name: Cimmino, B.
name: Clark, M.
name: Colijn, A. P.
name: Conrad, J.
name: Cuenca-García, J. J.
name: Cussonneau, J. P.
name: D'Andrea, V.
name: Decowski, M. P.
name: Di Gangi, P.
name: Di Pede, S.
name: Di Giovanni, A.
name: Di Stefano, R.
name: Diglio, S.
name: Elykov, A.
name: Farrell, S.
name: Ferella, A. D.
name: Fischer, H.
name: Fulgione, W.
name: Gaemers, P.
name: Gaior, R.
name: Galloway, M.
name: Gao, F.
name: Glade-Beucke, R.
name: Grandi, L.
name: Grigat, J.
name: Higuera, A.
name: Hils, C.
name: Hiraide, K.
name: Hoetzsch, L.
name: Howlett, J.
name: Iacovacci, M.
name: Itow, Y.
name: Jakob, J.
name: Joerg, F.
name: Kato, N.
name: Kavrigin, P.
name: Kazama, S.
name: Kobayashi, M.
name: Koltman, G.
name: Kopec, A.
name: Landsman, H.
name: Lang, R. F.
name: Levinson, L.
name: Li, I.
name: Liang, S.
name: Lindemann, S.
name: Lindner, M.
name: Liu, K.
name: Lombardi, F.
name: Long, J.
name: Lopes, J. A. M.
name: Ma, Y.
name: Macolino, C.
name: Mahlstedt, J.
name: Mancuso, A.
name: Manenti, L.
name: Manfredini, A.
name: Marignetti, F.
name: Undagoitia, T. Marrodán
name: Martens, K.
name: Masbou, J.
name: Masson, D.
name: Masson, E.
name: Mastroianni, S.
name: Messina, M.
name: Miuchi, K.
name: Mizukoshi, K.
name: Molinario, A.
name: Moriyama, S.
name: Morå, K.
name: Mosbacher, Y.
name: Murra, M.
name: Ni, K.
name: Oberlack, U.
name: Palacio, J.
name: Peres, R.
name: Pienaar, J.
name: Pierre, M.
name: Pizzella, V.
name: Plante, G.
name: Qi, J.
name: Qin, J.
name: García, D. Ramírez
name: Reichard, S.
name: Rocchetti, A.
name: Rupp, N.
name: Sanchez, L.
name: Santos, J. M. F. dos
name: Sartorelli, G.
name: Schreiner, J.
name: Schulte, D.
name: Eißing, H. Schulze
name: Schumann, M.
name: Lavina, L. Scotto
name: Selvi, M.
name: Semeria, F.
name: Shagin, P.
name: Shockley, E.
name: Silva, M.
name: Simgen, H.
name: Takeda, A.
name: Tan, P. -L.
name: Terliuk, A.
name: Therreau, C.
name: Thers, D.
name: Toschi, F.
name: Trinchero, G.
name: Tunnell, C.
name: Tönnies, F.
name: Valerius, K.
name: Volta, G.
name: Wei, Y.
name: Weinheimer, C.
name: Weiss, M.
name: Wenz, D.
name: Westermann, J.
name: Wittweg, C.
name: Wolf, T.
name: Xu, Z.
name: Yamashita, M.
name: Yang, L.
name: Ye, J.
name: Yuan, L.
name: Zavattini, G.
name: Zhang, Y.
name: Zhong, M.
name: Zhu, T.
name: Zopounidis, J. P.
name: Laubenstein, M.
name: Nisi, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The selection of low-radioactive construction materials is of the utmost importance for rare-event searches and thus critical to the XENONnT experiment. Results of an extensive radioassay program are reported, in which material samples have been screened with gamma-ray spectroscopy, mass spectrometry, and $^{222}$Rn emanation measurements. Furthermore, the cleanliness procedures applied to remove or mitigate surface contamination of detector materials are described. Screening results, used as inputs for a XENONnT Monte Carlo simulation, predict a reduction of materials background ($\sim$17%) with respect to its predecessor XENON1T. Through radon emanation measurements, the expected $^{222}$Rn activity concentration in XENONnT is determined to be 4.2$\,(^{+0.5}_{-0.7})\,μ$Bq/kg, a factor three lower with respect to XENON1T. This radon concentration will be further suppressed by means of the novel radon distillation system.