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Journal of Physics Conference Series

The VIP experiment

Sergio Bartalucci, S. Bertolucci, M. Bragadireanu, M Catti, M Carnielli, Catalina Curceanu, S. Di Matteo, J.-P. Egger, C. Guaraldo, M. Iliescu, T Ishivatari, Matthias Laubenstein, Johann Marton, E. Milotti, Dorel Pietreanu, Titus Ponta, D. L. Sirghi, Florin Catalin Sirghi, L Serandio, O. Vázquez Doce, E. Widmann, Johann Zmeskal

Published Jun 1, 2009• 0 citations
Publisher

Abstract

The VIP (Violation of the Pauli Exclusion Principle) experiment is dedicated to check the validity of one of the basic principles of modern physics. This investigation is done searching for anomalus X-rays emitted by copper atoms in a conductor: any detection of these anomalous X-rays would mark a Pauli forbidden transition. VIP is currently taking data at the Gran Saso underground laboratories, and its scientific goal is to improve by three-four orders of magnitude the previous limit on the probability of Pauli violating transitions, bringing it into the 10^-29÷ ^-30 region. The new experimental results and future plans are presented.

DOI
10.1088/1742-6596/174/1/012065

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Full text: The Pauli Exclusion Principle (PEP) represents one of the fundamental principles of modern physics and much of our comprehension of the matter is based on it. There are no compelling reasons to doubt its validity, but a lively debate on its limits is going on, due to the lack of an explanation based on fundamental principles. One possible experiment is to measure the violation of PEP with electrons. The experimental method consists of introducing new electrons into a copper strip and to look for x-rays resulting from the 2p {yields} 1s anomalous x-rays transitions emitted if one of the new electrons would be captured by a copper atom and cascades down to the 1s state already filled with two electrons of opposite spin. The goal of the VIP experiment is to lower the present limit on the probability that PEP is violated by electrons, obtained by Ramberg and Snow (limit {<=} 1.7 x 10{sup -26}) by about 4 orders of magnitude. To minimize the background the measurement will be performed in the Gran Sasso underground laboratory. Preliminary measurements were already performed. Presently the experiment is collecting data in Gran Sasso. The limit of PEP violation was already improved by two orders of magnitude. The results will be presented and the physics case discussed. (author)

•Jul 1, 2007•0 citations
The VIP (Violation of the Pauli Exclusion Principle) experiment is dedicated to check the validity of one of the basic principles of modern physics. This investigation is done searching for anomalus X-rays emitted by copper atoms in a conductor: any detection of these anomalous X-rays would mark a Pauli forbidden transition. VIP is currently taking data at the Gran Saso underground laboratories, and its scientific goal is to improve by three-four orders of magnitude the previous limit on the probability of Pauli violating transitions, bringing it into the 10^-29÷ ^-30 region. The new experimental results and future plans are presented.
The VIP (Violation of the Pauli Exclusion Principle) experiment is investigating one of the basic principles of modern physics, searching for anomalous X-rays emitted by copper atoms in a conductor: any detection of these anomalous X-rays would mark a Pauli forbidden transition. VIP is currently taking data at the Gran Sasso underground laboratories, and its scientific goal is to improve by three-four orders of magnitude the previous limit on the probability of Pauli violating transitions, bringing it into the 10-29÷-30 region. The new experimental results, together with future plans, are presented.
The Pauli Exclusion Principle (PEP) represents one of the fundamental principles of the modern physics and our comprehension of the surrounding matter is based on it. Even if today there are no compelling reasons to doubt its validity, it still spurs a lively debate on its limits, as testified by the abundant contributions found in the literature and in topical conferences. We present a method of searching for possible small violations of PEP for electrons, through the search for "anomalous" X-ray transitions in copper atoms, produced by "fresh" electrons which can decay in a Pauli-forbidden transition to the 1s level, already occupied by two electrons. The VIP Experiment has the scientific goal to improve by four orders of magnitude the present limit on the probability of PEP violation for electrons, bringing it into the 10-30–10-31 region. Preliminary results, together with future plans, are presented.
One of the fundamental rules of nature and a pillar in the foundation of quantum theory and thus of modern physics is represented by the Pauli Exclusion Principle. We know that this principle is extremely well fulfilled due to many observations. Numerous experiments were performed to search for tiny violation of this rule in various systems. The experiment VIP at the Gran Sasso underground laboratory is searching for possible small violations of the Pauli Exclusion Principle for electrons leading to forbidden X-ray transitions in copper atoms. VIP is aiming at a test of the Pauli Exclusion Principle for electrons with high accuracy, down to the level of 10 −29 – 10 −30 , thus improving the previous limit by 3–4 orders of magnitude. The experimental method, results obtained so far and new developments within VIP2 (follow-up experiment at Gran Sasso, in preparation) to further increase the precision by 2 orders of magnitude will be presented.
One of the fundamental rules of nature and a pillar in the foundation of quantum theory and thus of modern physics is represented by the Pauli Exclusion Principle. We know that this principle is extremely well fulfilled due to many observations. Numerous experiments were performed to search for tiny violation of this rule in various systems. The experiment VIP at the Gran Sasso underground laboratory is searching for possible small violations of the Pauli Exclusion Principle for electrons leading to forbidden X-ray transitions in copper atoms. VIP is aiming at a test of the Pauli Exclusion Principle for electrons with high accuracy, down to the level of 10−29^{-29}−29 - 10−30^{-30}−30, thus improving the previous limit by 3-4 orders of magnitude. The experimental method, results obtained so far and new developments within VIP2 (follow-up experiment at Gran Sasso, in preparation) to further increase the precision by 2 orders of magnitude will be presented.
The VIP-2 (VIolation of the Pauli Exclusion Principle) experiment conducted at the Gran Sasso underground laboratory (LNGS) of INFN is searching for possible tiny violations of standard quantum mechanics in copper atoms with extremely high sensitivity. We investigate atomic transitions with precision X-ray spectroscopy in order to test the Pauli Exclusion Principle (PEP) and therefore the spin-statistics theorem. We present the experimental method for the search for "anomalous" (i.e. Pauli-forbidden) X-ray transitions in copper atoms, produced by "new" electrons, which could have a tiny probability to undergo a Pauli-forbidden transition to the 1s ground state already occupied by two electrons. We describe the VIP-2 experimental setup and its recent optimisations. Presently VIP-2 is taking data at LNGS. The goal of VIP-2 is to test PEP for electrons with unprecedented accuracy, down to a limit in the probability that PEP is violated at the level of 10 −31 (and using a more elaborate analysis even 10 −40 ). We present current experimental results.
Full text: The Pauli Exclusion Principle (PEP) represents one of the fundamental principles of modern physics and much of our comprehension of the matter is based on it. There are no compelling reasons to doubt its validity, but a lively debate on its limits is going on, due to the lack of an explanation based on fundamental principles. One possible experiment is to measure the violation of PEP with electrons. The experimental method consists of introducing new electrons into a copper strip and to look for x-rays resulting from the 2p {yields} 1s anomalous x-rays transitions emitted if one of the new electrons would be captured by a copper atom and cascades down to the 1s state already filled with two electrons of opposite spin. The goal of the VIP experiment is to lower the present limit on the probability that PEP is violated by electrons, obtained by Ramberg and Snow (limit {<=} 1.7 x 10{sup -26}) by about 4 orders of magnitude. To minimize the background the measurement will be performed in the Gran Sasso underground laboratory. Preliminary measurements were already performed. Presently the experiment is collecting data in Gran Sasso. The limit of PEP violation was already improved by two orders of magnitude. The results will be presented and the physics case discussed. (author)