First tests on phonon threshold spectroscopy

Schnagl, J.; Angloher, G.; Feilitzsch, F. von; Huber, M.; Jochum, J.; Lanfranchi, J.‐C.; Sarsa, M.L.; Wänninger, S.

doi:10.1016/s0168-9002(99)01378-9

Cited by 9 publications

(17 citation statements)

References 2 publications

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“…Due to the long recombination time of quasiparticles at temperature well below the transition temperature of the superconductor, a significant fraction of the particle energy will be trapped in the superconductive layer in form of quasiparticles for a time that can extend up to the millisecond range in ultrapure aluminum. The subsequent recombination of quasiparticles to ∼ 1.2 K phonons will add a delayed component to the phonon signal read by the sensor on the crystal [54], less important in bulk events. Therefore, just by studying the signal shape and in particular the rise-time, it will be possible to discriminate bulk versus surface events, as the latter should be slower with a rise-time difference in the millisecond range.…”

Section: Discrimination Of Surface Radioactivity In Crossmentioning

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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Section: Discrimination Of Surface Radioactivity In Crossmentioning

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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“…Finally, it is important to develop procedures to avoid surface contamination during the construction and storage of the detector components and the detector assembling. In particular, any exposure to air may lead to dangerous 222 Rn-induced pollution. 126 To prevent that, the detector assembly has to be carried out at least in a clean room and/or in glove boxes under a nitrogen atmosphere, as e.g.…”

Section: 2017 1:18 Wspc/instruction File Lrt˙bolometers˙v04amentioning

confidence: 99%

“…In particular, in spite of a twice lower light yield, an efficient α rejection has been recently demonstrated with Li 2 100 MoO 4 scintillating bolometers operated without a reflecting film. 41 developed for dark mater search detectors, 222 in which only one superconducting thermometer is used, while the rest of the surface is covered by an additional superconducting film. The working principle is the following: athermal phonons released by a particle interaction within a few mm from the surface (i.e.…”

Section: Surface α and β Backgroundmentioning

confidence: 99%

Low background techniques in bolometers for double-beta decay search

Poda

Giuliani

2017

Int. J. Mod. Phys. A

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Bolometers are low temperature particle detectors with high energy resolution and detection efficiency. Some types of bolometric detectors are also able to perform an efficient particle identification. A wide variety of radiopure dielectric and diamagnetic materials makes the bolometric technique favorable for applications in astroparticle physics. In particular, thanks to their superior performance, bolometers play an important role in the world-wide efforts on searches for neutrinoless double-beta decay. Such experiments strongly require an extremely low level of the backgrounds that can easily mimic the process searched for. Here we overview recent progress in the development of low background techniques for bolometric double-beta decay searches.Comment: Review, a part of IJMPA Special Issue on Low Background Technique

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“…Rare α decay Ce, Nd, Sm, Eu, Gd, Dy, 144 Nd, 147,148,149 Sm, 151 Eu, [29] Ho, Er, Tm, Yb, Lu, Hf, 152 Gd, 174,176 Hf, 180 W, Ta, W, Re, Os, Ir, Pt, Au, 184,186,187 Os, 190 Pt, 209 Bi Hg, Tl, Pb, Bi, Th, U Rare β decay K, Ca, V, Rb, Zr, Cd, In, 50 V, 113 Cd, 115 In [29][30][31][32] Te, La, Lu, Ta, Re (4-fold-forbidden β decay) Double-β decay Ar, Ca, Cr, Fe, Ni, Zn, Ge, 48 Ca, 76 Ge, 82 Se, 96 Zr, [33][34][35][36][37] Se, Kr, Sr, Zr, Mo, Ru, Pd, 100 Mo, 110 Pd, 116 Cd, 124 Sn, Cd, Sn, Te, Xe, Ba, Ce, Nd, 130 Te, 136 Xe, 150 Nd Sm, Gd, Dy, Er, Yb, Hf, W, Os, Pt, Hg, Th, U Dark matter (WIMP a ) low/high atomic mass 7 Li, 11 B, 19 F, 23 Na, 27 Al, 73 Ge, [38][39][40]…”

Section: Applicationmentioning

confidence: 99%

Scintillation in Low-Temperature Particle Detectors

Poda

2021

Physics

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Inorganic crystal scintillators play a crucial role in particle detection for various applications in fundamental physics and applied science. The use of such materials as scintillating bolometers, which operate at temperatures as low as 10 mK and detect both heat (phonon) and scintillation signals, significantly extends detectors performance compared to the conventional scintillation counters. In particular, such low-temperature devices offer a high energy resolution in a wide energy interval thanks to a phonon signal detection, while a simultaneous registration of scintillation emitted provides an efficient particle identification tool. This feature is of great importance for a background identification and rejection. Combined with a large variety of elements of interest, which can be embedded in crystal scintillators, scintillating bolometers represent powerful particle detectors for rare-event searches (e.g., rare alpha and beta decays, double-beta decay, dark matter particles, neutrino detection). Here, we review the features and results of low-temperature scintillation detection achieved over a 30-year history of developments of scintillating bolometers and their use in rare-event search experiments.

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First tests on phonon threshold spectroscopy

Cited by 9 publications

References 2 publications

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

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

Low background techniques in bolometers for double-beta decay search

Scintillation in Low-Temperature Particle Detectors

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