Low background techniques in bolometers for double-beta decay search

Keywords lepton-number violation, neutrinos, beyond the Standard Model AbstractNeutrinoless double-beta decay is a forbidden, lepton-number-violating nuclear transition whose observation would have fundamental implications for neutrino physics, theories beyond the Standard Model and cosmology. In this review, we summarize the theoretical progress to understand this process, the expectations and implications under various particle physics models, as well as the nuclear physics challenges that affect the precise predictions of the decay half-life. We will also provide a synopsis of the current and future large-scale experiments that aim at discovering this process in physically well-motivated half-life ranges.

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“…The readers are referred to a comprehensive review of the use of bolometers in ββ-decay experiments in Ref. (190).…”

Section: Bolometersmentioning

confidence: 99%

Neutrinoless Double-Beta Decay: Status and Prospects

Dolinski

Poon

Rodejohann

2019

Annu. Rev. Nucl. Part. Sci.

529

393

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“…The Li 2 100 MoO 4 crystals are supported with three PTFE elements on the top and bottom, while the LDs are clamped with three PTFE pieces. In Commissioning I, we did not install any reflecting foil around the crystals, because previous measurements demonstrated efficient particle identification performance despite a factor of 2 lower light collection efficiency [18]. Commissioning I was characterized by sub-optimal LD performance (see Sec.…”

Section: Detector Structurementioning

confidence: 99%

The CUPID-Mo experiment for neutrinoless double-beta decay: performance and prospects

et al. 2020

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CUPID-Mo is a bolometric experiment to search for neutrinoless double-beta decay (0νβ β ) of 100 Mo. In this article, we detail the CUPID-Mo detector concept, assema e-mail: andrea.giuliani@csnsm.in2p3.fr bly, installation in the underground laboratory in Modane in 2018, and provide results from the first datasets. The demonstrator consists of an array of 20 scintillating bolometers comprised of 100 Mo-enriched 0.2 kg Li 2 MoO 4 crystals. The

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“…Bolometers, the instruments chosen for CROSS, are among the most powerful nuclear detectors for the conduction of sensitive 0ν2β decay searches in the calorimetric approach [27]. They can provide high sensitive mass (via large detector arrays), high detection efficiency, high energy resolution and extremely low background thanks to potentially high material radiopurity and methods to reject parasitic events [28]. A Q-value as high as possible is desirable since this places the signal in a lower background region and increases strongly the decay probability.…”

Section: Concepts Of the Cross Technologymentioning

confidence: 99%

The 0ν2β-decay CROSS experiment: preliminary results and prospects

Bandac¹,

Barabash²,

Bergé³

et al. 2020

J. High Energ. Phys.

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Neutrinoless double-beta decay is a key process in particle physics. Its experimental investigation is the only viable method that can establish the Majorana nature of neutrinos, providing at the same time a sensitive inclusive test of lepton number violation. CROSS (Cryogenic Rare-event Observatory with Surface Sensitivity) aims at developing and testing a new bolometric technology to be applied to future large-scale experiments searching for neutrinoless double-beta decay of the promising nuclei 100 Mo and 130 Te. The limiting factor in large-scale bolometric searches for this rare process is the background induced by surface radioactive contamination, as shown by the results of the CUORE experiment. The basic concept of CROSS consists of rejecting this challenging background component by pulse-shape discrimination, assisted by a proper coating of the faces of the crystal containing the isotope of interest and serving as energy absorber of the bolometric detector. In this paper, we demonstrate that ultra-pure superconductive Al films deposited on the crystal surfaces act successfully as pulse-shape modifiers, both with fast and slow phonon sensors. Rejection factors higher than 99.9% of α surface radioactivity have been demonstrated in a series of prototypes based on crystals of Li 2 MoO 4 and TeO 2 . We have also shown that point-like energy depositions can be identified up to a distance of ∼ 1 mm from the coated surface. The present program envisions an intermediate experiment to be installed underground in the Canfranc laboratory (Spain) in a CROSS-dedicated facility. This experiment, comprising ∼ 3×10 25 nuclei of 100 Mo, will be a general test of the CROSS technology as well as a worldwide competitive search for neutrinoless double-beta decay, with sensitivity to the effective Majorana mass down to 70 meV in the most favorable conditions.

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Low background techniques in bolometers for double-beta decay search

Cited by 60 publications

References 194 publications

Neutrinoless Double-Beta Decay: Status and Prospects

Neutrinoless Double-Beta Decay: Status and Prospects

The CUPID-Mo experiment for neutrinoless double-beta decay: performance and prospects

The 0ν2β-decay CROSS experiment: preliminary results and prospects

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