Volume 380 - Particles and Nuclei International Conference 2021 (PANIC2021) - Tests of symmetries and conservation laws
Testing Pauli Exclusion Principle for electrons at the LNGS underground laboratory: The VIP-2 experiment
L. De Paolis*, F. Napolitano, K. Piscicchia, S. Bartalucci, S. Bertolucci, M. Bazzi, M. Bragadireanu, M. Cargnelli, A. Clozza, C. Fiorini, C. Guaraldo, M. Iliescu, M. Laubenstein, J. Marton, M. Miliucci, E. Milotti, A. Porcelli, A. Scordo, F. Sgaramella, H. Shi, F.C. Sirghi, J. Zmeskal, C. Curceanu, R. Del Grande and D.L. Sirghi
Full text: pdf
Pre-published on: March 02, 2022
Published on: May 24, 2022
Abstract
The VIP-2 experiment tests the Pauli Exclusion Principle (PEP) for electrons at the Gran Sasso underground National Laboratory (LNGS) of INFN in Italy, looking for a possible violation. The LNGS provide an extremely low background environment, ideal for performing high precision X-ray spectroscopy measurements on electrons atomic transitions.
The core of the VIP-2 experimental apparatus is based on a copper target circulated by a Direct Current (DC) and surrounded by silicon drift detectors (SDDs), which offer excellent performance in X-ray spectroscopy in the energy range experimentally observed by VIP-2. The aim of VIP-2 is to look for eventual PEP-forbidden K$\alpha$ transitions (2p $\rightarrow$ 1s) in copper atoms, when the 1s level would be already occupied by two electrons, in contradiction with PEP. The energy of the K$\alpha$ forbidden transitions is about 300 eV less than the nominal energy of the K$\alpha$ PEP-allowed transition. This energy shift is due to the screening effect produced by the extra electron in fundamental level, and is detectable by means of a high precision X-ray spectroscopy measurement. About ten years ago, the VIP experiment set the best upper limit on the PEP violation probability $\beta^2/2<$4.7$~\times~10^{-29}$ for electrons. The goal of the VIP-2 experiment is to improve this limit by two orders of magnitude. This paper presents a new preliminary result, obtained by analysing two sets of data collected with a partial configuration of the VIP-2 apparatus.
DOI: https://doi.org/10.22323/1.380.0456
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