The Pauli Exclusion Principle for electrons tested by VIP-2 at the LNGS laboratories

De Paolis, L. and Bartalucci, S. and Bertolucci, S. and Bazzi, M. and Bragadireanu, M. (2022) The Pauli Exclusion Principle for electrons tested by VIP-2 at the LNGS laboratories. Il nuovo cimento C, 45 (5). pp. 1-4. ISSN 1826-9885

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Abstract

The VIP-2 experiment tests the Pauli Exclusion Principle (PEP) in a copper target circulated by a Direct Current, hunting for atomic Kα transitions (2p → 1s) that violate the PEP. Silicon Drift Detectors (SDDs) are installed around the target to measure the atomic transitions with high-precision x-ray detectors. A PEPviolating Kα transition would occur if an electron arrived on the 1s orbital which is already occupied by two electrons. The energy of the Kα forbidden transition in copper is expected to be shifted down by about 300 eV with respect to the nominal energy of the Kα PEP-allowed transition (∼8 keV). The SDD resolution is 190 eV (FWHM) at 8 keV and allows measuring and disentangling possible PEP-violating Kα transitions in copper. The VIP experiment sets an upper limit on the Pauli exclusion principle violation probability equal to β2/2 < 4.7×10−29 for electrons in copper. The VIP-2 experiment, presently in data taken at the National Laboratories of Gran Sasso (LNGS) in Italy, aims at improving the VIP limit by two orders of magnitude. This paper will present a new preliminary upper limit obtained by analyzing two sets of data collected in a preliminary run with the VIP-2 apparatus.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	06 Sep 2022 12:42
Last Modified:	06 Sep 2022 12:42
URI:	http://eprints.bice.rm.cnr.it/id/eprint/22008

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