Cerenkov emission as a positive tag of double beta decays in bolometric experiments

Fatis, T. Tabarelli de

doi:10.1140/epjc/s10052-009-1207-8

Cited by 73 publications

(83 citation statements)

References 16 publications

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“…A very important issue for these instruments is the light-detector sensitivity, which is crucial to achieve an adeguate background rejection in the most challenging situation (dark matter application and detection of Cherenkov light in TeO 2 bolometers [1]), but important also for the ZnSe [2] and ZnMoO 4 [3] scintillating bolometers, which are relevant for double beta decay search. In this work, we refer to the bolometric light detectors that use high impedance neutron transmutation doped (NTD) Ge thermistors as temperature sensors.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of antireflective coatings in Ge light detectors for scintillating bolometers

Mancuso

Beeman

Giuliani

et al. 2014

EPJ Web of Conferences

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Abstract. Luminescent bolometers are double-readout devices able to measure simultaneously the phonon and the light yields after a particle interaction in the detector. This operation allows in some cases to tag the type of the interacting quantum, crucial issue for background control in rare event experiments such as the search for neutrinoless double beta decay and for interactions of particle dark matter candidates. The light detectors used in the LUCIFER and LUMINEU searches (projects aiming at the study of the double beta interesting candidates 82 Se and 100 Mo using ZnSe and ZnMoO 4 scintillating bolometers) consist of hyper-pure Ge thin slabs equipped with NTD thermistors. A substantial sensitivity improvement of the Ge light detectors can be obtained applying a proper anti-reflective coatings on the Ge side exposed to the luminescent bolometer. The present paper deals with the investigation of this aspect, proving and quantifying the positive effect of a SiO 2 and a SiO coating and setting the experimental bases for future tests of other coating materials. The results confirm that an appropriate coating procedure helps in improving the sensitivity of bolometric light detectors by an important factor (in the range 20% -35%) and needs to be included in the recipe for the development of an optimized radio-pure scintillating bolometer.

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Section: Introductionmentioning

confidence: 99%

An experimental study of antireflective coatings in Ge light detectors for scintillating bolometers

Mancuso

Beeman

Giuliani

et al. 2014

EPJ Web of Conferences

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“…The signal produced by 130 Te 0νβ β decay is expected to produce a light signal of about 300 eV 8 . In literature, various Cherenkov light measurements with TeO 2 crystals can be found; the measured light signals in the ROI are always smaller than the expected ones.…”

Section: Cherenkov Light Emission In Teo 2 Crystalsmentioning

confidence: 99%

Background Suppression in Massive TeO $$_2$$ 2 Bolometers with Neganov–Luke Amplified Light Detectors

et al. 2015

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Background suppression in massive TeO 2 bolometers with Neganov-Luke amplified light detectors the date of receipt and acceptance should be inserted later Abstract Bolometric detectors are excellent devices for the investigation of neutrinoless double-beta decay (0νβ β ). The observation of such decay would demonstrate the violation of lepton number, and at the same time it would necessarily imply that neutrinos are Majorana particles. The sensitivity of cryogenic detectors based on TeO 2 is strongly limited by the α-background in the region of interest for the 0νβ β of 130 Te. It has been demonstrated that particle identification in TeO 2 bolometers is possible measuring the Cherenkov light produced by particle interactions. However, the discrimination efficiency is low and an event-by-event identification with NTD-based light detectors has to be demonstrated. We will discuss the performance of a highly-sensitive light detector exploiting the Neganov-Luke effect for signal amplification. The detector, being operated with NTD-thermistor and coupled to a 750 g TeO 2 crystal, shows the ability for an event-by-event identification of electron/gamma and α particles. The obtained results demonstrate the possibility to enhance the sensitivity of TeO 2 -based 0νβ β experiment to an unprecedented level.

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“…To this end, additional detection channels are needed, since the absorber does not respond differently for energy releases of different particle types. To distinguish signal electrons from α background, light emission can be used, either from Cherenkov radiation [22,23] or scintillation light [24,25,28,29], where the auxiliary light detector is usually another bolometer facing the main one. Recently new studies on scintillating bolometers showed the possibility to distinguish α from β/γ particles without light readout thanks to a different time-dependent shape of the heat signal [30,31].…”

Section: Beyond Cuorementioning

confidence: 99%

Neutrinoless double-beta decay search with CUORE and CUORE-0 experiments

Moggi

Artusa²,

Avignone³

et al. 2015

EPJ Web of Conferences

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Abstract. The Cryogenic Underground Observatory for Rare Events (CUORE) is an upcoming experiment designed to search for the neutrinoless double-beta decays. Observation of the process would unambiguously establish that neutrinos are Majorana particles and provide information on their absolute mass scale hierarchy. CUORE is now under construction and will consist of an array of 988 TeO 2 crystal bolometers operated at 10 mK, but the first tower (CUORE-0) is already taking data. The experimental techniques used will be presented as well as the preliminary CUORE-0 results. The current status of the full-mass experiment and its expected sensitivity will then be discussed.

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Cerenkov emission as a positive tag of double beta decays in bolometric experiments

Cited by 73 publications

References 16 publications

An experimental study of antireflective coatings in Ge light detectors for scintillating bolometers

An experimental study of antireflective coatings in Ge light detectors for scintillating bolometers

Background Suppression in Massive TeO $$_2$$ 2 Bolometers with Neganov–Luke Amplified Light Detectors

Neutrinoless double-beta decay search with CUORE and CUORE-0 experiments

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