CANDLES project for double beta decay of 48Ca

Yoshida, S.; Kishimoto, T.; Ogawa, Izumi; Hazama, R.; Umehara, S.; Matsuoka, K.; Yokoyama, D.; Mukaida, K.; Ichihara, K.; Tatewaki, Y.

doi:10.1016/j.nuclphysbps.2004.11.051

Cited by 21 publications

(6 citation statements)

References 4 publications

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“…For this reason scintillators are widely used in double β decay experiments. It is worth to mention a pioneer work of der Mateosian and Goldhaber to search for neutrinoless double β decay of 48 Ca by using enriched and depleted in 48 Ca calcium fluoride [CaF 2 (Eu)] crystal scintillators [28]. During the last two decades several high sensitivity studies of the double β decay processes were performed using crystal scintillators with specific candidate nuclei.…”

Section: 1 Double β Decaymentioning

confidence: 99%

“…The most sensitive 2β experiments with crystal scintillators are reported in Table 1. [45] Large-scale scintillator-based projects to search for neutrinoless double β decay with sensitivity on the level of the inverted hierarchy of the neutrino masses have been proposed [46,47,48]. In this regard, it is of note that the SuperNEMO double β decay project [49] intents to utilize a large amount of plastic scintillators for the calorimeter of the detector [50].…”

Section: 1 Double β Decaymentioning

confidence: 99%

“…Two neutrino 2β decay, despite it is the rarest decay ever observed, becomes one of the most significant background sources in the experiments aiming to search for 0ν2β decay with smaller Q 2β . For this reason the AMoRE collaboration developed CaMoO 4 crystal scintillators enriched in the isotope100 Mo and depleted in48 Ca[274,56]. Another example is CdMoO 4 crystal scintillators proposed to search for 0ν2β decay of116 Cd and 100 Mo[275]: in this case the 2ν2β − decays of 100 Mo will generate background in the region of interest of116 Cd.…”

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confidence: 99%

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Radioactive contamination of scintillators

Danevich

Tretyak

2018

Int. J. Mod. Phys. A

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Low counting experiments (search for double β decay and dark matter particles, measurements of neutrino fluxes from different sources, search for hypothetical nuclear and subnuclear processes, low background α, β, γ spectrometry) require extremely low background of a detector. Scintillators are widely used to search for rare events both as conventional scintillation detectors and as cryogenic scintillating bolometers. Radioactive contamination of a scintillation material plays a key role to reach low level of background. Origin and nature of radioactive contamination of scintillators, experimental methods and results are reviewed. A programme to develop radiopure crystal scintillators for low counting experiments is discussed briefly.

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Section: 1 Double β Decaymentioning

confidence: 99%

Section: 1 Double β Decaymentioning

confidence: 99%

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confidence: 99%

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Radioactive contamination of scintillators

Danevich

Tretyak

2018

Int. J. Mod. Phys. A

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“…CANDLES is a project which aims to look for the 0νββ decay of 48 Ca by using CaF 2 detectors [19,38]. The decay has a very high Q ββ -value (4272 keV), which makes the experiment practically insensitive to the environmental γ background.…”

Section: Candlesmentioning

confidence: 99%

Status of double beta decay experiments using isotopes other than 136 Xe

Pandola

2014

Physics of the Dark Universe

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Neutrinoless double beta decay is a lepton-number violating process predicted by many extensions of the standard model. It is actively searched for in several candidate isotopes within many experimental projects. The status of the experimental initiatives which are looking for the neutrinoless double beta decay in isotopes other than 136 Xe is reviewed, with special emphasis given to the projects that passed the R&D phase. The results recently released by the experiment Gerda are also summarized and discussed. The Gerda data give no positive indication of neutrinoless double beta decay of 76 Ge and disfavor in a model-independent way the longstanding observation claim on the same isotope. The lower limit reported by Gerda for the half-life of neutrinoless double beta decay of 76 Ge is T 0ν 1/2 > 2.1 · 10 25 yr (90 % C.L.), or T 0ν 1/2 > 3.0 · 10 25 yr, when combined with the results of other 76 Ge predecessor experiments.

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“…The CANDLES experiment is an experiment looking to study 0νββ in 48 Ca [51]. The end-point energy for this isotope is above the energy range of the GEANIE spectrometer in this experiment, and thus crosssection information is not available for this isotope.…”

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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CANDLES project for double beta decay of 48Ca

Cited by 21 publications

References 4 publications

Radioactive contamination of scintillators

Radioactive contamination of scintillators

Status of double beta decay experiments using isotopes other than 136 Xe

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

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