Testing Pauli Exclusion Principle for electrons at the LNGS underground laboratory: the VIP-2 experiment

被引:0
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作者
De Paolis, Luca [1 ]
Napolitano, Fabrizio [1 ]
Piscicchia, Kristian [2 ,3 ]
Bartalucci, Sergio [1 ]
Bertolucci, Sergio [6 ,7 ]
Bazzi, Massimiliano [1 ]
Bragadireanu, Mario [1 ,5 ]
Cargnelli, Michael [4 ]
Clozza, Alberto [1 ]
Del Grande, Raffaele [1 ,8 ]
Fiorini, Carlo [9 ,10 ]
Guaraldo, Carlo [1 ]
Iliescu, Mihai
Laubenstein, Matthias [11 ]
Marton, Johann
Miliucci, Marco [1 ]
Milotti, Edoardo [12 ,13 ]
Porcelli, Alessio [1 ,4 ]
Scordo, Alessandro [1 ]
Sgaramella, Francesco [1 ]
Shi, Hexi [4 ]
Sirghi, Diana Laura [1 ,5 ]
Sirghi, Florin [1 ,5 ]
Zmeskal, Johann [4 ]
Curceanu, Catalina [1 ]
机构
[1] INFN, Lab Nazl Frascati, Via E Fermi 54, I-00044 Frascati, RM, Italy
[2] Ctr Ric Enrico Fermi Museo Stor Fis, Via Panisperna 89A, I-00184 Rome, Italy
[3] Ctr Studi & Ric Enrico Fermi, Via Panisperna 89A, I-00184 Rome, Italy
[4] Stefan Meyer Inst Subat Phys, Kegelgasse 27, A-1030 Vienna, Austria
[5] Horia Hulubei Natl Inst Phys & Nucl Engn, Str Atomistilor 407,POB MG 6, Buchares Magurele, Romania
[6] Univ Bologna, Dipartimento Fis & Astron, Via Irnerio 46, I-40126 Bologna, Italy
[7] INFN Sez Bologna, Via Irnerio 46, I-40126 Bologna, Italy
[8] Tech Univ Munich, Excellence Cluster Universe, Boltzmannstr 2, D-85748 Garching, Germany
[9] Politecn Milan, Dipartimento Elettron Informaz & Bioingn, I-20133 Milan, Italy
[10] INFN Sez Milano, I-20133 Milan, Italy
[11] INFN, Lab Nazl Gran Sasso, Via G Acitelli 22, I-67100 Laquila, Italy
[12] Univ Trieste, Dipartimento Fis, Via Valerio 2, I-34127 Trieste, Italy
[13] INFN Sez Trieste, Via Valerio 2, I-34127 Trieste, Italy
基金
欧盟地平线“2020”;
关键词
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中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The VIP-2 experiment tests the Pauli Exclusion Principle (PEP) for electrons at the Gran Sasso underground National Laboratories (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 possible PEP-forbidden K alpha transitions (2p -> 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 the fundamental level, and is detectable through a high precision X-ray spectroscopy measurement. The precedent VIP experiment set the best upper limit on the PEP violation probability beta(2)/2 <4.7 x 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.
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