We search for x-rays from abnormal atomic orbit electron transitions that may violate the Pauli Exclusion Principle, in the VIP-2 experiment at Gran Sasso national laboratory. The candidate events come from a $2p$ electron transits into a $1s$ orbit which is occupied by two electrons. Such event, if exists, will have detectable energy difference from normal $2p-1s$ atomic transition by few hundreds of electron-volts in case it occurs in a copper atom, and the energy difference is expected to be the result of the electromagnetic shielding effect from the additional electron in the ground state.
The experimental setup with the complete detector system was mounted in the underground laboratory in 2015, and we started the physics run without the final passive lead shielding since October 2016.
From two months of data taking, we confirmed the performance of the apparatus that will fulfill the designed goal of the experiment. Moreover preliminary result from the first period of physics run already improved the upper limit set by the previous VIP experiment.
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Mini-workshop: Quantum Foundations and Quantum Information
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Alberto Clozza
(LNF-INFN)
Alessandro Scordo
(L)
Alessandro d'Uffizi
(LNF-INFN)
Alexandru Mario Bragadireanu
(IFIN-HH (RO))
Andreas Pichler
Antonio Romero Vidal
(University of Santiago de Compostela (ES))
Carlo Guaraldo
(Laboratori Nazionali di Frascati (LNF))
Carolina Berucci
(SMI, OeAW)
Catalina Curceanu
(LNF-INFN)
Diana Laura Sirghi
(LNF-INFN)
Dorel Pietreanu
(IFIN-HH Bucharest (RO))
Eberhard Widmann
(Austrian Academy of Sciences (AT))
Edoardo Milotti
(Dipartimento di Fisica, Universita di Trieste and INFN-Sezione di Trieste, Italy)
Florin Sirghi
(LNF-INFN)
Jean-Pierre Egger
(Institut de Physique, Universite de Neuchâtel, Switzerland)
Johann Marton
(Oesterreichische Akademie der Wissenschaften)
Johann Zmeskal
(Austrian Academy of Sciences (AT))
Kristian Piscicchia
(INFN - National Institute for Nuclear Physics)
Laura Sperandio
(LNF-INFN)
Luca De Paolis
(LNF-INFN)
Massimiliano Bazzi
(LNF-INFN)
Matthias Laubenstein
(INFN, Laboratori Nazionali del Gran Sasso, Italy)
Michael Cargnelli
(Unknown)
Mihail Antoniu Iliescu
(I)
Oton Vazquez Doce
(Technische Universitaet Muenchen (DE))
Sergio Bartalucci
(LNF-INFN)
Sergio Bertolucci
(Istituto Nazionale Fisica Nucleare Frascati (IT))
Sergio Di Matteo
(Institut de Physique UMR CNRS-UR, Universite de Rennes1)
T Ponta
(IFIN-HH)
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