CERN Accelerating science

Article
Report number	arXiv:1505.02991
Title	VIP 2: Experimental tests of the Pauli Exclusion Principle for electrons
Author(s)	Pichler, A. (Stefan Meyer Inst. Subatomare Phys.) ; Bartalucci, S. (Frascati) ; Bertolucci, S. (CERN) ; Berucci, C. (Stefan Meyer Inst. Subatomare Phys. ; Frascati) ; Bragadireanu, M. (Frascati ; Bucharest, IFIN-HH) ; Cargnelli, M. (Stefan Meyer Inst. Subatomare Phys.) ; Clozza, A. (Frascati) ; Curceanu, C. (Frascati ; Bucharest, IFIN-HH ; Enrico Fermi Ctr., Rome) ; De Paolis, L. (Frascati) ; Di Matteo, S. (Rennes U.) ; D'Uffizi, A. (Frascati) ; Egger, J.P. (Neuchatel U.) ; Guaraldo, C. (Frascati) ; Iliescu, M. (Frascati) ; Ishiwatari, T. (Stefan Meyer Inst. Subatomare Phys.) ; Laubenstein, M. (Gran Sasso) ; Marton, J. (Stefan Meyer Inst. Subatomare Phys.) ; Milotti, E. (Trieste U. ; INFN, Trieste) ; Pietreanu, D. (Frascati ; Bucharest, IFIN-HH) ; Piscicchia, K. (Frascati ; Enrico Fermi Ctr., Rome) ; Ponta, T. (Frascati) ; Sbardella, E. (Frascati) ; Scordo, A. (Frascati) ; Shi, H. (Stefan Meyer Inst. Subatomare Phys.) ; Sirghi, D. (Bucharest, IFIN-HH) ; Sirghi, F. (Stefan Meyer Inst. Subatomare Phys. ; Frascati) ; Sperandio, L. (Frascati) ; Vazquez-Doce, O. (Munich, Tech. U., Universe) ; Widmann, E. (Stefan Meyer Inst. Subatomare Phys.) ; Zmeskal, J. (Stefan Meyer Inst. Subatomare Phys.)
Publication	2015-04-29
Imprint	12 May 2015
Number of pages	6
Note	Comments: EXA 2014 proceedings in Hyperfine Interactions (2015), Springer International Publishing EXA 2014 proceedings in Hyperfine Interactions (2015), Springer International Publishing
In:	Hyperfine Interact. 233 (2015) 121-126
In:	5th International Conference on Exotic Atoms and Related Topics, Vienna, Austria, 15 - 19 Sep 2014, pp.121-126
DOI	10.1007/s10751-015-1180-6
Subject category	Detectors and Experimental Techniques
Abstract	Many experiments investigated the violation of the Pauli Exclusion Principle (PEP) since its discovery in 1925. The VIP (VIolation of the Pauli Principle) experiment tested the PEP by measuring the probability for an external electron to be captured and undergo a 2p to 1s transition during its cascading process, where the 1s state is already occupied by two electrons. This transition is forbidden by the Pauli Exclusion Principle. The VIP experiment resulted in a preliminary upper limit for the probability of the violation of the PEP of 4.7 x 10^{-29}. Currently a setup for the follow-up experiment VIP 2 is under preparation. The goal of this experiment is to improve the upper limit for the violation of the PEP by two orders of magnitude, by different improvements like enhanced energy resolution of the X-ray detectors and by implementing an active shielding. Here we report currently ongoing performance tests of the new parts of the setup.
Copyright/License	arXiv nonexclusive-distrib. 1.0

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