Na-based crystal scintillators for next-generation rare event searches

Nagorny, S.S.; Rusconi, C.; Sorbino, S.; Beeman, J. W.; Bellini, F.; Cardani, L.; Grigorieva, V. D.; Pagnanini, L.; Nisi, S.; Novoselov, Igor; Pirro, S.; Schäffner, K.; Shlegel, V.N.

doi:10.1016/j.nima.2020.164160

Cited by 13 publications

(8 citation statements)

References 45 publications

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“…We will equip the detector with an silicon heater, in order to exploit the standard TGS technique and perform a pulse scan to determine the low energy threshold very precisely. Also the calibration can be remarkably improved, using a removable γ-source made by a thoriated tungsten wire, which provides X-rays and γ-peaks ranging from few keV up to 2.6 MeV [28]. In this condition, we expect to reach the low energy threshold at the level of 1 keV along with an improved energy resolution at order of 5 keV (FWHM) on the 511 keV peak.…”

Section: Results and Perspectivesmentioning

confidence: 99%

Development of cryogenic calorimeters to measure the spectral shape of In-115 beta decay

Celi,

Galazka,

Laubenstein

et al. 2021

Preprint

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The spectral shape of forbidden beta-decays is a crucial benchmark for nuclear physics calculations and has important implications also for astroparticle physics experiments. Among the interesting isotopes in this field, 115 In is an excellent candidate, being a primordial nuclide featuring a good compromise among Q-value (497.954 keV) and half-life (4.41 × 10 14 yr). In this paper, we propose to exploit a cryogenic calorimeter based on In 2 O 3 crystal to perform a high-precision measurement of the β-decay energy spectrum, discussing also the results obtained within a preliminary test of this crystal and the next steps to improve the detector performance.

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Section: Results and Perspectivesmentioning

confidence: 99%

Development of cryogenic calorimeters to measure the spectral shape of In-115 beta decay

Celi,

Galazka,

Laubenstein

et al. 2021

Preprint

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“…Taking into account such a possible application, a sodium tungstate (Na 2 W 2 O 7 ) represents a great interest as a cryogenic scintillator [428]. The first bolometric operation of the material has been recently realized at LNGS using a 5.6 g Na 2 W 2 O 7 scintillation element (10 × 10 × 10 mm, LTG Cz growth) coupled to a large-area Ge LD ( 50.8 × 0.2 mm) [429]. An efficient scintillation (L/H γ(β) = 12.8 keV/MeV) together with an excellent particle identification capability (QF α = 0.20) have been observed.…”

Section: Sodium Tungstatementioning

confidence: 99%

“…A highly purified MoO 3 powder and a commercial Na 2 CO 3 (4N purity grade) were used as starting materials for the LTG-Cz-based production of the Na 2 Mo 2 O 7 scintillator [429]. In a bolometric operation of a small sample (10 × 10 × 10 mm, 3.6 g), realized together with the same-size Na 2 W 2 O 7 crystal (see Section 3.1.4), the detected scintillation is characterized by L/H γ(β) = 1.61 keV/MeV and QF α = 0.16 [429]. In spite of relatively modest performance of the LD (0.3 keV RMS noise), a particle identification was clearly demonstrated.…”

Section: Sodium Molybdatementioning

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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“…Sodium molybdate crystals are novel candidates among such crystals, with relatively high light yield and good optical properties, and therefore considered to be promising materials for cryogenic calorimeters with the simultaneous scintillation detection. Because sodium molybdate also contains the nuclei of Na, which is one of the target elements used in the observation of the controversial dark matter signal by the DAMA/LIBRA collaboration [6], the interest in this type of crystal is currently growing [5,[7][8][9]. Despite the encouraging results, earlier studies on the development of sodium molybdate cryogenic calorimeters were conducted with crystals of only a few grams, which, in most cases, had relatively poor crystallinity and light collection.…”

Section: Introductionmentioning

confidence: 99%

An MMC-based cryogenic calorimeter with a massive sodium molybdate crystal absorber for neutrinoless double beta decay searches

Kim

Sharma

et al. 2022

J. Inst.

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Sodium molybdate crystals are excellent scintillating target material that can be used to investigate the neutrinoless double beta decay of 100Mo. Because this material contains Na nuclei, it could also be used to clarify the contribution of Na in the controversial claim of dark matter observation by the DAMA/LIBRA experiment. Recent developments have allowed the growth of sodium molybdate crystals of several hundred grams, which makes it possible to build large scale experiments. Therefore, a cryogenic calorimeter with a crystal of significant mass, which can exploit the excellent energy resolution from thermal signals and particle identification using the scintillation signals, is highly desired. We have developed a cryogenic calorimeter with a cylindrical sodium molybdate crystal of 178 g with dimensions of 4 cm (height) × 4 cm (diameter) coupled to a metallic magnetic calorimeter (MMC). The detector was also equipped with a light detector with a thin Ge absorber to detect scintillation signals. The detector test measurements showed excellent energy resolution and particle discrimination using dual detection of heat and light signals, and thus demonstrate that the crystal is a promising tool for searching for rare phenomena events. Details of the detector development with the massive sodium molybdate crystal are discussed in this paper along with the performance results from test measurements.

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Na-based crystal scintillators for next-generation rare event searches

Cited by 13 publications

References 45 publications

Development of cryogenic calorimeters to measure the spectral shape of In-115 beta decay

Development of cryogenic calorimeters to measure the spectral shape of In-115 beta decay

Scintillation in Low-Temperature Particle Detectors

An MMC-based cryogenic calorimeter with a massive sodium molybdate crystal absorber for neutrinoless double beta decay searches

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