The VIP Experiment

Bartalucci, S.; Bertolucci, S.; Bragadireanu, M.; Bucci, C.; Cargnelli, M.; Catitti, M.; Curceanu, C.; Matteo, S. Di; Egger, J. P.; Ferrari, Nicola; Fuhrmann, H.; Guaraldo, C.; Iliescu, M.; Ishiwatari, T.; Laubenstein, M.; Márton, J.; Milotti, E.; Pietreanu, D.; Ponta, T.; Sirghi, D.; Sirghi, F.; Sperandio, L.; Widmann, E.; Zmeskal, J.

doi:10.1063/1.2158743

Cited by 10 publications

(12 citation statements)

References 36 publications

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“…The established upper limit on the probability for the 'new' electron passing in the conductor to form a non-Paulian atom with 3 electrons in the K-shell is 1.7 · 10 −26 . An improvement of the sensitivity of the method is currently being planned by the VIP collaboration [38]. Laser atomic and molecular spectroscopy were used to search for anomalous PEP-forbidden spectral lines of 4 He atoms [39] The violation of PEP in the nucleon system has been studied by searching for the non-Paulian transitions with γ-emission [43,44] (Kamiokande, NEMO-II), p-emission [45,46,35] (Elegant-V, DAMA/LIBRA) and n-emission [47] (Koshomoto et al,), non-Paulian β + -and β − -decays [48,44] The strongest limits for non-Paulian transitions in 12 C with γ-, p-, n-, α-, and β ± -emissions were obtained with a prototype of the Borexino detector -Counting Test Facility (CTF) [50].…”

Section: Introductionmentioning

confidence: 99%

New experimental limits on the Pauli-forbidden transitions inC12nuclei obtained with485days Borexino data

Bellini¹,

Bonetti²,

Avanzini³

et al. 2010

Phys. Rev. C

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The Pauli exclusion principle (PEP) has been tested for nucleons (n, p) in 12 C with the Borexino detector.The approach consists of a search for γ, n, p and β ± emitted in a non-Paulian transition of 1P 3/2shell nucleons to the filled 1S 1/2 shell in nuclei. Due to the extremely low background and the large mass (278 t) of the Borexino detector, the following most stringent up-to-date experimental bounds on PEP violating transitions of nucleons have been established: τ ( 12 C → 12 C + γ) ≥ 5.0 · 10 31 y, τ ( 12 C → 11 B + p) ≥ 8.9 · 10 29 y, τ ( 12 C → 11 C + n) ≥ 3.4 · 10 30 y, τ ( 12 C → 12 N + e − + νe) ≥ 3.1 · 10 30 y and τ ( 12 C → 12 B + e + + νe) ≥ 2.1 · 10 30 y, all at 90% C.L. The corresponding upper limits on the relative strengths for the searched non-Paulian electromagnetic, strong and weak transitions have been estimated: δ 2 γ ≤ 2.2 · 10 −57 , δ 2 N ≤ 4.1 · 10 −60 and δ 2 β ≤ 2.1 · 10 −35 .

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Section: Introductionmentioning

confidence: 99%

New experimental limits on the Pauli-forbidden transitions inC12nuclei obtained with485days Borexino data

Bellini¹,

Bonetti²,

Avanzini³

et al. 2010

Phys. Rev. C

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“…To extract the experimental limit on the probability that PEP is violated for electrons, /3^/2, from our data, we used the same arguments of Ramberg and Snow: see references [10] and [22] for details of the analysis. The obtained value is:…”

Section: Results Obtained At Lnf-infnmentioning

confidence: 99%

Experimental tests of quantum mechanics: Pauli exclusion principle violation and spontaneous collapse models

Curceanu

Bartalucci

Bassi

et al. 2012

AIP Conference Proceedings

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The Pauli exclusion principle (PEP) is one of the basic principles of the modern physics. Being at the very basis of our understanding of matter, it spurs, presently, a lively debate on its possible limits, deeply rooted in the very foundations of Quantum Field Theory. Therefore, it is extremely important to test the limits of its validity. Quon theory provides a suitable mathematical framework of possible violation of PEP, where the violation parameter q translates into a probability of violating PEP. Experimentally, setting a bound on PEP violation means confining the violation parameter to a value very close to either 1 (for bosons) or -1 (for fermions). The VIP (VIolation of the Pauli exclusion principle) experiment established a limit on the probability that PEP is violated by electrons, using the method of searching for PEP forbidden atomic transitions in copper. We describe the experimental method, the obtained results, both in terms of the q-parameter from quon theory and as probability of PEP violation, we briefly discuss them and present future plans to go beyond the actual limit by upgrading the experimental technique using vetoed new spectroscopical fast Silicon Drift Detectors. We also mention the possibility of using a similar experimental technique to search for eventual X-rays, generated in the spontaneous collapse models

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“…[15] VIP experiment followed the similar method of Ramberg-Snow experiment, and used the same definition of the parameter 1 2 β 2 to represent the violation to the PEP for a direct comparison of the experiment results. The improvement in sensitivity was achieved firstly due to the site of the experiment at the underground laboratory in Laboratori Nazionali del Gran Sasso (LNGS), which has the advantage of the excellent shielding against cosmic rays [12]. The other reason is the use of Charge Coupled Device (CCD) as the X-ray detector which had a typical resolution of 320 eV at 8 keV, that increased the precision in the definition of the region of interest to search for anomalous X-rays.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Energy spectra for the VIP experiment[12] : (a) with 40 A current, (b) without current, from part of the data set. Normal K transitions of Cu present are background, and they are due to excitation of target by cosmic rays and environmental radiations.…”

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confidence: 99%

Testing the Pauli Exclusion Principle for Electrons at LNGS

et al. 2015

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High-precision experiments have been done to test the Pauli exclusion principle (PEP) for electrons by searching for anomalous K-series X-rays from a Cu target supplied with electric current. With the highest sensitivity the VIP (VIolation of Pauli Exclusion Principle) experiment set an upper limit at the level of 10−29 for the probability that an external electron captured by a Cu atom can make the transition from the 2p state to a 1s state already occupied by two electrons. In a follow-up experiment at Gran Sasso, we aim to increase the sensitivity by two orders of magnitude. We show proofs that the proposed improvement factor is realistic based on the results from recent performance tests of the detectors we did at Laboratori Nazionali di Frascati (LNF)

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The VIP Experiment

Cited by 10 publications

References 36 publications

New experimental limits on the Pauli-forbidden transitions inC12nuclei obtained with485days Borexino data

New experimental limits on the Pauli-forbidden transitions inC12nuclei obtained with485days Borexino data

Experimental tests of quantum mechanics: Pauli exclusion principle violation and spontaneous collapse models

Testing the Pauli Exclusion Principle for Electrons at LNGS

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