Study of 2β-decay of 100Mo and 82Se using the NEMO3 detector

Arnold, R.; Augier, C.; Baker, J. D.; Barabash, A. S.; Brudanin, V.; Caffrey, A.J.; Egorov, V.; Guyonnet, J.L.; Hubert, F.; Hubert, Ph.; Jenner, L.; Jollet, C.; Jullian, S.; Klimenko, A.; Kochetov, O.; Коновалов, С. И.; Kovalenko, V.; Lalanne, D.; Leccia, F.; Linck, I.; Longuemare, C.; Lutter, G.; Marquet, Ch.; Mauger, F.; Nicholson, H.; Ohsumi, H.; Piquemal, F.; Reyss, J. L.; Saakyan, R.; Sarazin, X.; Scheibling, F.; Shitov, Yu.; Simard, L.; Smolnikov, A.; Štekl, I.; Suhonen, J.; Sutton, C.S.; Szklarz, G.; Timkin, V.; Thomas, J. C.; Tretyak, V.I.; Umatov, V.; Vála, L.; Vanyushin, I.A.; Vasiliev, S. I.; Vasilyev, V.; Vorobel, V.; Vylov, Ts.

doi:10.1134/1.1830651

Cited by 35 publications

(15 citation statements)

References 33 publications

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“…In the case of 100 Mo the decay proceeds mainly through the 1 + intermediate nucleus and the single state dominance (SSD) hypothesis should give a good approximation. This is also confirmed by spectra measurements in the NEMO-3 experiment [47,48].…”

Section: Results Of Calculationssupporting

confidence: 71%

Experimental test of the Pauli Exclusion Principle

Barabash

2009

Found Phys

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A short review is given of three experimental works on tests of the Pauli Exclusion Principle (PEP) in which the author has been involved during the last 10 years. In the first work a search for anomalous carbon atoms was done and a limit on the existence of such atoms was determined, $^{12}\tilde{\mathrm C}$ / $^{12}$C $< 2.5\times10^{-12}$. In the second work PEP was tested with the NEMO-2 detector and the limits on the violation of PEP for p-shell nucleons in $^{12}$C were obtained. Specifically, transitions to the fully occupied $1s_{1/2}$-shell yielded a limit of $4.2\times10^{24}$ y for the process with the emission of a $\gamma$-quantum. Similarly limits of $3.1\times10^{24}$ y for $\beta^-$ and $2.6\times10^{24}$ y for $\beta^+$ Pauli-forbidded transition of $^{12}$C $\to$ $^{12}\tilde{\mathrm N}$($^{12}\tilde{\mathrm B}$) are reported. In the third work it was assumed that PEP is violated for neutrinos, and thus, neutrinos obey at least partly the Bose-Einstein statistics. Consequences of the violation of the exclusion principle for double beta decays were considered. This violation strongly changes the rates of the decays and modifies the energy and angular distributions of the emitted electrons. It was shown that pure bosonic neutrinos are excluded by the present experimental data. In the case of partly bosonic neutrinos the analysis of the existing data allows one to put an upper bound for $sin^2\chi < 0.6$. The sensitivity of future measurements is also evaluated.Comment: 19 pages, 9 figures; talk at Workshop "Theoretical and experimental aspects on the spin-statistics connection and related symmetries" (Trieste, Italy, October 21-25, 2008

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Section: Results Of Calculationssupporting

confidence: 71%

Experimental test of the Pauli Exclusion Principle

Barabash

2009

Found Phys

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“…It was found that the measured lower limit on the ββ-decay half-life far exceeds the values expected for this process, T 0ν 1/2 ∼ 10 12 − 10 15 years. In 1955 the Raymond Davis experiment [7], which searched for the antineutrinos from reactor via nuclear reaction ν e + 37 Cl → 37 Ar + e − , produced a zero result. The above experiments were interpreted ‡ For more detailed historical review of the experimental activities in the field of double-beta decay we recommend reader a recent review on this subject by A. Barabash [6].…”

Section: The Early Periodmentioning

confidence: 99%

“…Neutrinoless double beta decay has not yet been confirmed. The strongest limits on the half-life of the 0νββ-decay were set in Heidelberg-Moscow [36], NEMO3 [37,38], CUORICINO [39] and KamLAND-Zen [40] experiments: T 0ν 1/2 ( 76 Ge) ≥ 1.9 × 10 25 y, T 0ν 1/2 ( 100 Mo) ≥ 1.0 × 10 24 y, T 0ν 1/2 ( 130 Te) ≥ 3.0 × 10 24 y, T 0ν 1/2 ( 136 Xe) ≥ 5.7 × 10 24 y.…”

Section: The Period Of Massive Neutrinos -The Current Periodmentioning

confidence: 99%

Theory of neutrinoless double-beta decay

Vergados¹,

Ejiri²,

Šimkovic³

2012

Rep. Prog. Phys.

529

729

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Abstract. Neutrinoless double beta decay, which is a very old and yet elusive process, is reviewed. Its observation will signal that lepton number is not conserved and the neutrinos are Majorana particles. More importantly it is our best hope for determining the absolute neutrino mass scale at the level of a few tens of meV. To achieve the last goal certain hurdles have to be overcome involving particle, nuclear and experimental physics. Nuclear physics is important for extracting the useful information from the data. One must accurately evaluate the relevant nuclear matrix elements, a formidable task. To this end, we review the sophisticated nuclear structure approaches recently been developed, which give confidence that the needed nuclear matrix elements can be reliably calculated employing different methods: a) the various versions of the Quasiparticle Random Phase Approximations, b) the interacting boson model, c) the energy density functional method and d) the large basis Interacting Shell Model. It is encouraging that, for the light neutrino mass term at least, these vastly different approaches now give comparable results. From an experimental point of view it is challenging, since the life times are long and one has to fight against formidable backgrounds. One needs large isotopically enriched sources and detectors with high energy resolution, low thresholds and very low background. If a signal is found, it will be a tremendous accomplishment. Then, of course, the real task is going to be the extraction of the neutrino mass from the observations. This is not trivial, since current particle models predict the presence of many mechanisms other than the neutrino mass, which may contribute or even dominate this process. We will, in particular, consider the following processes: We will show that it is possible to disentangle the various mechanisms and unambiguously extract the important neutrino mass scale, if all the signatures of the reaction are searched in a sufficient number of nuclear isotopes.Neutrinoless double beta decay 2

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“…Then in February 2003, after the final tuning of the experimental set-up, NEMO 3 has been taking data devoted to double beta decay studies. The first results with 100 Mo, 82 Se, 150 Nd and 96 Zr were published in [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Investigation of double-beta decay with the NEMO-3 detector

Barabash

Brudanin

2011

Phys. Atom. Nuclei

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The double beta decay experiment NEMO 3 has been taking data since February 2003. The aim of this experiment is to search for neutrinoless (0νββ) decay and investigate two neutrino double beta decay in seven different isotopically enriched samples ( 100 Mo, 82 Se, 48 Ca, 96 Zr, 116 Cd, 130 Te and 150 Nd). After analysis of the data corresponding to 3.75 y, no evidence for 0νββ decay in the 100 Mo and 82 Se samples was found. The half-life limits at the 90% C.L. are 1.1 · 10 24 y and 3.6 · 10 23 y, respectively. Additionally for 0νββ decay the following limits at the 90% C.L. were obtained, > 1.3 · 10 22 y for 48 Ca, > 9.2 · 10 21 y for 96 Zr and > 1.8 · 10 22 y for 150 Nd. The 2νββ decay half-life values were precisely measured for all investigated isotopes.

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Study of 2β-decay of 100Mo and 82Se using the NEMO3 detector

Cited by 35 publications

References 33 publications

Experimental test of the Pauli Exclusion Principle

Experimental test of the Pauli Exclusion Principle

Theory of neutrinoless double-beta decay

Investigation of double-beta decay with the NEMO-3 detector

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