MOON for spectroscopic studies of double beta decays and the present status of the MOON-1 prototype detector

Nakamura, Hidehito; Ejiri, H.; Fushimi, K.; Ichihara, K.; Matsuoka, K.; Nomachi, M.; Hazama, R.; Umehara, S.; Yoshida, S.; Ogama, T; Sakiuchi, Takuya; Hai, Vo Hong; Sugaya, Y.

doi:10.1088/1742-6596/39/1/091

Cited by 12 publications

(4 citation statements)

References 5 publications

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“…The data was in good agreement with the fitting result by the equation (4) The measured energy resolution of the large beta camera, which consists of the large plastic-scintillator plate 53 cm × 53 cm × 1 cm with 32 PMTs for studying the absolute neutrinomass, is σ 32 = 4.8 ± 0.2 % (∆E/E = 11.4 ± 0.5 % in FWHM) at 0.976 MeV regions [8], [9], [14]. The non-statistical component of the energy resolution is found to be σ nonstat = 4.1 ± 0.4 % (∆E/E = 9.7 ± 0.9 % in FWHM).…”

Section: Energy Resolution Of Beta Camerasupporting

confidence: 83%

“…The plastic scintillator plate is viewed by 5.08 cm φ PMTs H7195 provided by HAMAMATSU PHOTONICS [7]. The good energy resolution of the scintillation detector can be obtained by scintillation-photon collection [8], [9]. In order to achieve the efficient scintillation-photon, the 4 PMTs are coupled to the four sides of the plastic-scintillator plate covering about 85 %.…”

Section: A Beta Camera Configurationmentioning

confidence: 99%

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Study of Statistical and Non-statistical Components of Energy Resolution for High-sensitive Beta Camera

Nakamura¹,

Ejiri

Nomachi

et al. 2006

2006 IEEE Nuclear Science Symposium Conference Record

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Energy resolution of a scintillation detector was studied from the viewpoints of statistical and non-statistical components. The statistical component is caused mainly by fluctuation of the number of photo-electrons, N, collected at the anode of a photo-detector and the non-statistical component comes from intrinsic property of the scintillator. A new method identifying these two components was developed to study the resolution of detector as beta camera. The beta camera consists of a 6 cm × 6 cm × 1 cm plastic-scintillator plate (BC-408 provided by SAINT GOBAIN) and 4 photomultiplier tubes covered each side face of the plastic-scintillator. The statistical component is found to be well reproduced by N 1 . The nonstatistical component of the plastic-scintillator is σ stat = 4.0 ± 0.3 % (∆E/E = 9.3 ± 0.8 % in FWHM) at the 976 keV region. The present method is useful for investigating statistical and nonstatistical components of the resolution, and thus to improve and monitor them.

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Section: Energy Resolution Of Beta Camerasupporting

confidence: 83%

Section: A Beta Camera Configurationmentioning

confidence: 99%

Study of Statistical and Non-statistical Components of Energy Resolution for High-sensitive Beta Camera

Nakamura¹,

Ejiri

Nomachi

et al. 2006

2006 IEEE Nuclear Science Symposium Conference Record

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“…In this case, the source is a thin foil made of the ββ candidate, while the detector consists in a tracker combined with a calorimeter. This technique was successfully employed for example by Elegans V whose planned prosecution is MOON [107]. However, the best example of passive-source tracking detectors is certainly the NEMO3 [108] experiment where tracking was associated with particle charge identification (thanks to the presence of a magnetic field) allowing not only an efficient background rejection but also a precise measurement of the different background sources producing the experimental counting rate.…”

Section: Inhomogeneous Tracking Detectorsmentioning

confidence: 99%

Challenges in Double Beta Decay

Cremonesi

Pavan

2014

Advances in High Energy Physics

152

149

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After nearly 80 years since the first guess on its existence, neutrino still escapes our insight: the mass and the true nature (Majorana or Dirac) of this particle is still unknown. In the past ten years, neutrino oscillation experiments have finally provided the incontrovertible evidence that neutrinos mix and have finite masses. These results represent the strongest demonstration that the Standard Model of electroweak interactions is incomplete and that new Physics beyond it must exist. None of these experimental efforts could however shade light on some of the basic features of neutrinos. Indeed, absolute scale and ordering of the masses of the three generations as well as charge conjugation and lepton number conservation properties are still unknown. In this scenario, a unique role is played by the Neutrinoless Double Beta Decay searches: these experiments can probe lepton number conservation, investigate the Dirac/Majorana nature of the neutrinos and their absolute mass scale (hierarchy problem) with unprecedented sensitivity. Today Neutrinoless Double Beta Decay faces a new era where large scale experiments with a sensitivity approaching the so-called degenerate-hierarchy region are nearly ready to start and where the challenge for the next future is the construction of detectors characterized by a tonne-scale size and an incredibly low background, to fully probe the invertedhierarchy region. A number of new proposed projects took up this challenge. These are based either on large expansions of the present experiments or on new ideas to improve the technical performance and/or reduce the background contributions. On the other hand, nuclear theorists are making remarkable progress in the calculation of the double beta decay nuclear matrix elements in order to eliminate the theoretical uncertainties affecting the particle physics interpretation of this process. In this paper, a review of the most relevant ongoing experiments is given. The most relevant parameters contributing to the experimental sensitivity are discussed and a critical comparison of the future projects is proposed.

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“…The value of m ee will allow us to estimate the m 0 range, albeit with a large uncertainty owing to the complete lack of knowledge of the phases δ, φ 1 and φ 2 currently. The present upper bound on the average neutrino mass is m ee < 1.1 eV [63], whereas the proposed next generation experiments like COBRA [64], CUORE [65], EXO [66], GERDA [67], Super-NEMO [68], MOON [69] plan to probe m ee in the range as low as 0.01 eV ≤ m ee ≤ 0.1 eV.…”

Section: Bounds On θ 13 At Low Scalementioning

confidence: 99%

Renormalization group evolution of neutrino mixing parameters near $θ_{13} = 0$ and models with vanishing $θ_{13}$ at the high scale

Dighe,

Goswami,

Ray

2008

Preprint

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Renormalization group (RG) evolution of the neutrino mass matrix may take the value of the mixing angle θ 13 very close to zero, or make it vanish. On the other hand, starting from θ 13 = 0 at the high scale it may be possible to generate a non-zero θ 13 radiatively. In the most general scenario with non-vanishing CP violating Dirac and Majorana phases, we explore the evolution in the vicinity of θ 13 = 0, in terms of its structure in the complex U e3 plane. This allows us to explain the apparent singularity in the evolution of the Dirac CP phase δ at θ 13 = 0. We also introduce a formalism for calculating the RG evolution of neutrino parameters that uses the Jarlskog invariant and naturally avoids this singular behaviour. We find that the parameters need to be extremely fine-tuned in order to get exactly vanishing θ 13 during evolution. For the class of neutrino mass models with θ 13 = 0 at the high scale, we calculate the extent to which RG evolution can generate a nonzero θ 13 , when the low energy effective theory is the standard model or its minimal supersymmetric extension. We find correlated constraints on θ 13 , the lightest neutrino mass m 0 , the effective Majorana mass m ee measured in the neutrinoless double beta decay, and the supersymmetric parameter tan β.

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MOON for spectroscopic studies of double beta decays and the present status of the MOON-1 prototype detector

Cited by 12 publications

References 5 publications

Study of Statistical and Non-statistical Components of Energy Resolution for High-sensitive Beta Camera

Study of Statistical and Non-statistical Components of Energy Resolution for High-sensitive Beta Camera

Challenges in Double Beta Decay

Renormalization group evolution of neutrino mixing parameters near $θ_{13} = 0$ and models with vanishing $θ_{13}$ at the high scale

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