Removing krypton from xenon by cryogenic distillation to the ppq level

作者：E. Aprile, J. Aalbers, F. Agostini, M. Alfonsi, F. D. Amaro, M. T. Anthony, F. Arneodo, Peter Barrow, L. Baudis, B. Bauermeister, M. L. Benabderrahmane, Thomas Berger, P. A. Breur, A. Brown, A. Brown, S. Bruenner, G. Bruno, R. Budnik, Lukas Bütikofer, J. Calvén, J. M. R. Cardoso, M. Cervantes, D. Cichon, D. Coderre, A. P. Colijn, J. M. Conrad, J. P. Cussonneau, M. P. Decowski, P. de Perio, P. Di Gangi, A. Di Giovanni, S. Diglio, E. Duchovni, G. Eurin, J. Fei, A. D. Ferella, A. Fieguth, D. Franco, W. Fulgione, A. Gallo Rosso, M. Galloway, F. Gao, M. Garbini, C. Geis, L. W. Goetzke, L. Grandi, Z. Greene, C. Grignon, C. Hasterok, E. Hogenbirk, C. Huhmann, R. Itay, B. Kaminsky, G. Kessler, A. Kish, H. Landsman, R. F. Lang, D. Lellouch, L. J. Levinson, M. Le Calloch, Q. Lin, S. Lindemann, M. Lindner, J. A. M. Lopes, A. Manfredini, Ioana Codrina Mariş, T. Marrodán Undagoitia, J. Masbou, Fabio Valerio Massoli, D. Masson, D. Mayani, Yue Meng, M. Messina, K. Micheneau, B. Miguez, A. Molinario, M. Murra, J. Naganoma, K. Ni, U. Oberlack, S. E. A. Orrigo, P. Pakarha, B. Pelssers, R. Persiani, F. Piastra, J. Pienaar, M.-C. Piro, V. Pizzella, G. Plante, N. Priel, L. Rauch, S. Reichard, C. Reuter, A. Rizzo, S. S. E. Rosendahl, N. Rupp, R. Saldanha, J.M.F. dos Santos, G. Sartorelli, M. Scheibelhut, S. M. Schindler, J. Schreiner, M. Schümann, L. Scotto Lavina, M. Selvi, P. Shagin, E. Shockley, M. Silva, H. Simgen, M. v. Sivers, A. Stein, D. Thers, A. Tiseni, G. Trinchero, C. Tunnell, N. Upole, H. Wang, Y. Wei, C. Weinheimer, J. Wulf, Ye J, Y. Zhang, Ion Cristescu · 发表于：The European Physical Journal C · 年份：2017 · DOI：10.1140/epjc/s10052-017-4757-1 · 被引用次数：71 · 研究领域：Dark Matter and Cosmic Phenomena、Particle physics theoretical and experimental studies、Atomic and Subatomic Physics Research

The XENON1T experiment aims for the direct detection of dark matter in a detector filled with 3.3 tons of liquid xenon. In order to achieve the desired sensitivity, the background induced by radioactive decays inside the detector has to be sufficiently low. One major contributor is the $$\beta $$ -emitter $$^{85}$$ Kr which is present in the xenon. For XENON1T a concentration of natural krypton in xenon $$\mathrm {^{nat}\mathrm{Kr/Xe}\,<\,200\,ppq}$$ (parts per quadrillion, $$1~\mathrm{ppq}~=10^{-15} \mathrm{mol/mol}$$ ) is required. In this work, the design, construction and test of a novel cryogenic distillation column using the common McCabe–Thiele approach is described. The system demonstrated a krypton reduction factor of $$6.4\cdot 10^5$$ with thermodynamic stability at process speeds above 3 kg/h. The resulting concentration of $$\mathrm {^{nat}\mathrm{Kr/Xe}<26\,ppq}$$ is the lowest ever achieved, almost one order of magnitude below the requirements for XENON1T and even sufficient for future dark matter experiments using liquid xenon, such as XENONnT and DARWIN.