Aprile E, Aalbers J, Agostini F, Alfonsi M, Althueser L, Amaro F D, Antochi V C, Angelino E, Angevaare J R, Arneodo F, Barge D, Baudis L, Bauermeister B, Bellagamba L, Benabderrahmane M L, Berger T, Breur P A, Brown A, Brown E, Bruenner S, Bruno G, Budnik R, Capelli C, Cardoso J M R, Cichon D, Cimmino B, Clark M, Coderre D, Colijn A P, Conrad J, Cussonneau J P, Decowski M P, Depoian A, Di Gangi P, Di Giovanni A, Di Stefano R, Diglio S, Elykov A, Eurin G, Ferella A D, Fulgione W, Gaemers P, Gaior R, Rosso A Gallo, Galloway M, Gao F, Grandi L, Garbini M, Hasterok C, Hils C, Hiraide K, Hoetzsch L, Hogenbirk E, Howlett J, Iacovacci M, Itow Y, Joerg F, Kato N, Kazama S, Kobayashi M, Koltman G, Kopec A, Landsman H, Lang R F, Levinson L, Lin Q, Lindemann S, Lindner M, Lombardi F, Lopes J A M, López Fune E, Macolino C, Mahlstedt J, Manenti L, Manfredini A, Marignetti F, Undagoitia T Marrodán, Martens K, Masbou J, Masson D, Mastroianni S, Messina M, Miuchi K, Molinario A, Morå K, Moriyama S, Mosbacher Y, Murra M, Naganoma J, Ni K, Oberlack U, Odgers K, Palacio J, Pelssers B, Peres R, Pienaar J, Pizzella V, Plante G, Qin J, Qiu H, García D Ramírez, Reichard S, Rocchetti A, Rupp N, Santos J M F Dos, Sartorelli G, Šarčević N, Scheibelhut M, Schindler S, Schreiner J, Schulte D, Schumann M, Lavina L Scotto, Selvi M, Semeria F, Shagin P, Shockley E, Silva M, Simgen H, Takeda A, Therreau C, Thers D, Toschi F, Trinchero G, Tunnell C, Vargas M, Volta G, Wack O, Wang H, Wei Y, Weinheimer C, Weiss M, Wenz D, Westermann J, Wittweg C, Wulf J, Xu Z, Yamashita M, Ye J, Zavattini G, Zhang Y, Zhu T, Zopounidis J P
Physics Department, Columbia University, New York, NY 10027 USA.
Department of Physics, Oskar Klein Centre, Stockholm University, AlbaNova, 10691 Stockholm, Sweden.
Eur Phys J C Part Fields. 2021;81(4):337. doi: 10.1140/epjc/s10052-020-08777-z. Epub 2021 Apr 20.
The selection of low-radioactive construction materials is of utmost importance for the success of low-energy rare event search experiments. Besides radioactive contaminants in the bulk, the emanation of radioactive radon atoms from material surfaces attains increasing relevance in the effort to further reduce the background of such experiments. In this work, we present the Rn emanation measurements performed for the XENON1T dark matter experiment. Together with the bulk impurity screening campaign, the results enabled us to select the radio-purest construction materials, targeting a Rn activity concentration of in of xenon. The knowledge of the distribution of the Rn sources allowed us to selectively eliminate problematic components in the course of the experiment. The predictions from the emanation measurements were compared to data of the Rn activity concentration in XENON1T. The final Rn activity concentration of in the target of XENON1T is the lowest ever achieved in a xenon dark matter experiment.
对于低能量稀有事件搜索实验的成功而言，选择低放射性建筑材料至关重要。除了材料整体中的放射性污染物外，在进一步降低此类实验本底的努力中，材料表面放射性氡原子的析出变得越来越重要。在这项工作中，我们展示了为XENON1T暗物质实验进行的氡析出测量。连同整体杂质筛选活动，这些结果使我们能够选择放射性最纯的建筑材料，目标是在氙气中达到每立方米的氡活度浓度。氡源分布的知识使我们能够在实验过程中有选择地消除有问题的组件。将析出测量的预测结果与XENON1T中氡活度浓度的数据进行了比较。XENON1T靶标中最终每立方米的氡活度浓度是氙暗物质实验中所达到的最低值。
