MOON (Mo Observatory Of Neutrinos) for double beta decay

Nomachi, M.; Doe, P. J.; Ejiri, H.; Elliott, S. R.; Engel, J.; Finger, M. H.; Formaggio, J. A.; Fushimi, K.; Gehman, V. M.; Gorin, A.; Greenfield, M. B.; Hazama, R.; Ichihara, K.; Ikegami, Y.; Ishii, H.; Itahashi, T.; Kavitov, P.; Kekelidze, V.; Kuroda, K.; Kutsalo, V.; Manouilov, I.; Matsuoka, K.; Nakamura, Hirotaka; Ogama, T; Para, A.; Rielage, K.; Rjazantsev, A.; Robertson, R. G. H.; Shichijo, Y.; Shima, T.; Shimada, Yuichiro; Shirkov, G.; Sissakian, A.; Sugaya, Y.; Титов, А. И.; Vatulin, V.; Vilches, O. E.; Voronov, V. V.; Wilkerson, J. F.; Will, D. I.; Yoshida, S.

doi:10.1016/j.nuclphysbps.2004.11.053

Cited by 18 publications

(4 citation statements)

References 7 publications

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“…We note that the running experiment NEMO3 has already measured the electron angular distribution for the two neutrino double beta decay, and is capable of measuring this correlation in the future for the 0ν2β decay as well, assuming that the experimental sensitivity is sufficiently good to establish this decay [41]. The proposed experimental facilities that can measure the electron angular correlation in the 0ν2β decays are SuperNEMO [42], MOON [43], and EXO [44]. We have argued in this paper that there is a strong case in building at least one of them.…”

Section: Electron Angular Correlation In Left-right Symmetric Modelsmentioning

confidence: 99%

Probing new physics in the neutrinoless double beta decay using electron angular correlation

2007

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The angular correlation of the electrons emitted in the neutrinoless double beta decay (0ν2β) is presented using a general Lorentz invariant effective Lagrangian for the leptonic and hadronic charged weak currents. We show that the coefficient K in the angular correlation dΓ/d cos θ ∝ (1 − K cos θ) is essentially independent of the nuclear matrix element models and present its numerical values for the five nuclei of interest ( 76 Ge, 82 Se, 100 Mo, 130 Te, and 136 Xe), assuming that the 0ν2β-decays in these nuclei are induced solely by a light Majorana neutrino, νM . This coefficient varies between K = 0.81 (for the 76 Ge nucleus) and K = 0.88 (for the 82 Se and 100 Mo nuclei), calculated taking into account the effects from the nucleon recoil, the S and P -waves for the outgoing electrons and the electron mass. Deviation of K from its values derived here would indicate the presence of New Physics (NP) in addition to a light Majorana neutrino, and we work out the angular coefficients in several νM + NP scenarios for the 76 Ge nucleus. As an illustration of the correlations among the 0ν2β observables (half-life T 1/2 , the coefficient K, and the effective Majorana neutrino mass | m |) and the parameters of the underlying NP model, we analyze the left-right symmetric models, taking into account current phenomenological bounds on the right-handed WR-boson mass and the left-right mixing parameter ζ.It is now established beyond any doubt that the observed neutrinos have tiny but non-zero masses and they mix with each other, with both of these features following from the observation of the atmospheric and solar neutrino oscillations and from the long baseline neutrino oscillation experiments [1]. Theoretically, it is largely anticipated that the neutrinos are Majorana particles. Experimental evidence for the neutrinoless double beta decay (0ν2β) would deliver a conclusive confirmation of the Majorana nature of neutrinos, establishing the existence of physics beyond the standard model. This is the overriding interest in carrying out these experiments and in the related phenomenology [2].We recall that 0ν2β-decays are forbidden in the standard model (SM) by lepton number (LN) conservation, which is a consequence of the renormalizability of the SM. However, being the low energy limit of a more general theory, an extended version of the SM could contain nonrenormalizable terms (tiny to be compatible with experiments), in particular, terms that violate LN and allow the 0ν2β decay. Probable mechanisms of LN violation may include exchanges by: Majorana neutrinos ν M s [3, 4, 5] (the preferred mechanism after the observation of neutrino oscillations [1]), SUSY particles [6,7,8,9,10,11], scalar bilinears (SBs) [12], e.g. doubly charged dileptons (the component ξ −− of the SU (2) L triplet Higgs scalar etc.), leptoquarks (LQs) [13], right-handed W R bosons [5,14] etc. From these particles light νs are much lighter than the electron and others are much heavier than the proton. Therefore, there are two possible classes of mechanis...

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Section: Electron Angular Correlation In Left-right Symmetric Modelsmentioning

confidence: 99%

Probing new physics in the neutrinoless double beta decay using electron angular correlation

2007

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“…The selenium, zirconium, and molybdenum isotopes have all been grouped together because experiments such as MOON and SuperNEMO are designed to measure any of these isotopes, in addition to several other isotopes in their setups [56,57]. There does not appear to be many interfering γ -ray lines in the immediate vicinity of 82 Se.…”

Section: Cross Sections Relevant To 0νββ Decay Searchesmentioning

confidence: 99%

Neutron inelastic scattering in natural Cu as a background in neutrinoless double-βdecay experiments

Boswell

Elliott²,

Perepelitsa³

et al. 2013

Phys. Rev. C

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Background: Experiments designed to study rare processes, such as neutrinoless double-β decay (0νββ), are crucial tests for physics beyond the standard model. These experiments rely on reducing the intrinsic radioactive background to unprecedented levels, while adequately shielding the detectors from external sources of radioactivity. Purpose: The purpose of this work is focused on understanding the background rates from neutron interactions in Cu shielding in regions around the Q values of many candidate 0νββ decay isotopes, as well as providing data for benchmarking Monte Carlo simulations of background events. Methods: Using the broad-spectrum neutron beam at Los Alamos Neutron Science Center, we have measured γ rays emitted from inelastic neutron scattering on nat Cu. Results: We extracted the level cross sections from the γ -production cross section for 46 energy levels in nat Cu. These level cross sections were compared with the available experimental data, as well as the ENDF/B-VII evaluation for discrete levels. Conclusions: For energy levels above 2 MeV we found significant discrepancies between the suggested level cross sections for both nuclei and our data. We found reasonable agreement between our measurement and the ENDF/B-VII evaluation for the total neutron inelastic cross section in 63 Cu. Our measurement of the total neutron inelastic scattering cross section in 65 Cu was 30% lower than the ENDF/B-VII evaluations, which we attribute to unobserved transitions in 65 Cu. Furthermore, we found that the implementation of the ENDF/B-VII evaluation in simulations did not properly model the decay properties of the nucleus to the degree necessary for estimating backgrounds in rear-event searches. Finally, we examined the potential implications of our measurements on 0νββ measurements and found that many of the commonly studied 0νββ isotopes had Q values below the cutoff for ENDF/B-VII evaluated discrete levels in either Cu nucleus.

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“…There are also two other experiments which are planning to use heterogeneous techniques: MOON [51] and DCBA [52]. MOON will use one tonne of 100 Mo and hopes to achieve an effective neutrino mass sensitivity of m ν < 50 meV.…”

Section: Experiments Following the Heterogeneous Systemmentioning

confidence: 99%

Measurement of the double beta decay half-life of Nd-150 and search for neutrinoless decay modes with the NEMO-3 detector

Fatemi-Ghomi

2009

Preprint

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MOON (Mo Observatory Of Neutrinos) for double beta decay

Cited by 18 publications

References 7 publications

Probing new physics in the neutrinoless double beta decay using electron angular correlation

Probing new physics in the neutrinoless double beta decay using electron angular correlation

Neutron inelastic scattering in natural Cu as a background in neutrinoless double-βdecay experiments

Measurement of the double beta decay half-life of Nd-150 and search for neutrinoless decay modes with the NEMO-3 detector

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