LUMINEU: A Pilot Scintillating Bolometer Experiment for Neutrinoless Double Beta Decay Search

Tenconi, M.

doi:10.1016/j.phpro.2014.12.099

Cited by 32 publications

(18 citation statements)

References 11 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%

“…In particular the light detectors consist of hyper-pure Ge thin slabs equipped with NTD thermistor for the read-out. This structure is convenient due to the simplicity of the detector assembly and very well tested [2,3]. In order to improve the sensitivity of this kind of detectors there exist several options but in this paper we focus on the use of proper anti-reflective coatings on the Ge side exposed to the luminescent bolometer aiming at an increase of the light collection efficiency.…”

Section: Introductionmentioning

confidence: 99%

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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%

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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“…In scintillating bolometers for 0ν2β search, employed in the LUMINEU [27] and LUCIFER [37] projects, the light emitted by the scintillating crystal is detected and measured by an auxiliary bolometer, consisting of a pure Ge wafer, working as light collector and energy absorber. The wafer is coupled to a neutron transmutation doped (NTD) Ge thermistor, serving as a temperature sensor.…”

Section: Neganov-luke Light Detectorsmentioning

confidence: 99%

“…Recently, lithium molybdate (Li 2 MoO 4 ) crystal scintillators were successfully tested as scintillating bolometers [25,26]. Subsequently, a technique to grow largevolume, high-quality Li 2 MoO 4 crystal scintillators with low radioactive contamination -embedding also enriched 100 Mo -was developed in the framework of the LUMINEU [27,28] and ISOTTA [29] projects with outstanding results [30,31]. This makes this material very promising for 0ν2β experiments with 100 Mo.…”

Section: Introductionmentioning

confidence: 99%

Rejection of randomly coinciding events in Li $$_2^{100}\mathrm{MoO}_4$$ 2 100 MoO 4 scintillating bolometers using light detectors based on the Neganov–Luke effect

et al. 2016

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Random coincidences of nuclear events can be one of the main background sources in low-temperature calorimetric experiments looking for neutrinoless doublebeta decay, especially in those searches based on scintillating bolometers embedding the promising double-beta candidate 100 Mo, because of the relatively short half-life of the twoneutrino double-beta decay of this nucleus. We show in this work that randomly coinciding events of the two-neutrino double-beta decay of 100 Mo in enriched Li 100 2 MoO 4 detectors can be effectively discriminated by pulse-shape analysis in the light channel if the scintillating bolometer is provided with a Neganov-Luke light detector, which can improve the signal-to-noise ratio by a large factor, assumed here at the level of ∼750 on the basis of preliminary experimental results obtained with these devices. The achieved pile-up rejection efficiency results in a very low contribution, of the order of ∼6 × 10 −5 counts/(keV·kg·y), to the background counting rate in the region of interest for a large volume (∼90 cm 3 ) Li 100 2 MoO 4 detector. This background level is very encouraging in view of a possible use of the Li 100 2 MoO 4 solution for a bolometric tonne-scale next-generation experiment as that proposed in the CUPID project.

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“…For Mo-100, the Q ββ value (τ 1/2 < 1 × 10 24 years) is above the natural background γ -ray radiation (∼2.6 MeV) [1]. LUMINEU will use the simultaneous measurements of the heat and light of events in large enriched zinc molybdate (ZnMoO 4 [1][2][3]) scintillators to discriminate α particles and achieve a virtually zero background [4,5]. Unresolved pile-up of close two neutrino double beta decay (2ν2β) pulses, however, can produce events (τ 1/2 = (7.17 ± 0.54) × 10 18 years [6]) in the 0ν2β energy range and is the dominant background.…”

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confidence: 99%

The First Tests of a Large-Area Light Detector Equipped with Metallic Magnetic Calorimeters for Scintillating Bolometers for the LUMINEU Neutrinoless Double Beta Decay Search

et al. 2016

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International audienceFuture rare-event searches using scintillating crystals need very low background levels for high sensitivity, however, unresolved pile-up can limit this. We present the design and fabrication of large-area photon detectors based on metallic magnetic calorimeters (MMCs), optimized for fast rise times to resolve close pile-up. The first prototypes have been characterized using Fe-55 X-rays and ZnMoO$_{4}$ crystal scintillation light. A fast intrinsic rise time of 25–30 $\upmu $ s has been measured and has been compared to the 250 $\upmu $ s scintillation light pulse rise time constant. The difference indicates that the scintillation process limits the light pulse rise time. The fast rise time allows for a reduction of background due to close pile-up events as well as the study of the inherent crystal scintillation process. MMC-based photon detectors are shown to be a promising tool for scintillating crystal based rare event searches

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LUMINEU: A Pilot Scintillating Bolometer Experiment for Neutrinoless Double Beta Decay Search

Cited by 32 publications

References 11 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

Rejection of randomly coinciding events in Li $$_2^{100}\mathrm{MoO}_4$$ 2 100 MoO 4 scintillating bolometers using light detectors based on the Neganov–Luke effect

The First Tests of a Large-Area Light Detector Equipped with Metallic Magnetic Calorimeters for Scintillating Bolometers for the LUMINEU Neutrinoless Double Beta Decay Search

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