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- W4214834429 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." @default.
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- W4214834429 date "2022-03-02" @default.
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- W4214834429 title "Testing Pauli Exclusion Principle for electrons at the LNGS underground laboratory: The VIP-2 experiment" @default.
- W4214834429 doi "https://doi.org/10.22323/1.380.0456" @default.
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