1.3kg bolometers to search for rare events

Arnaboldi, C.; Brofferio, C.; Bucci, C.; Gorla, P.; Pessina, G.; Pirro, S.

doi:10.1016/j.nima.2005.07.060

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…TeO 2 crystals have mechanical and optical characteristics that match very well the requirements for thermal detectors. At the same time, significant developments in preparing powder out of this compound and in growing the crystals allow nowadays the production of almost perfect (bubble-free, crack-free and twin-free) crystal boules from which crystals with masses of the order of 750 g [42,43] or more [44,45] can be routinely obtained. TeO 2 satisfies also the tight requirements imposed on radiopurity: thanks to dedicated production lines for the raw powder synthesis, the crystal growth and the surface processing, crystals with bulk contamination of the order of 10 −6 Bq kg −1 for 238 U and 232 Th, and with surface contamination levels of a few 10 −9 Bq cm −2 for both 238 U and 232 Th [46,47], are now achievable [43,46].…”

Section: Teo 2 Bolometers For 0νββ Studiesmentioning

confidence: 99%

Neutrinoless Double Beta Decay Experiments With TeO2 Low-Temperature Detectors

2019

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Neutrinoless double beta decay (0νββ) is a powerful tool to investigate Lepton Number Violation (LNV), and the only practical way to assess the nature of the neutrinos. It can therefore provide unique information about the Physics Beyond the Standard Model. If observed, 0νββ would unambiguously demonstrate that neutrinos are Majorana particles and would provide a precise measurement of their mass. Among the many experimental techniques used in the search for this rare process, low-temperature detectors represent one of the most promising choices: they show an excellent energy resolution and can scale to very large masses. In this work, we review the most relevant experiments based on TeO 2 bolometers that have been developed and taking data at the Laboratori Nazionali del Gran Sasso (LNGS), Italy, since the early 90's. This 30-years-old effort has led to the design and construction of the CUORE detector, currently taking data at LNGS. The use of low-temperature detectors allows to study the 0νββ of 130 Te on both ground and excited states, and to explore different decay mechanisms ("standard" light neutrino exchange, Majoron emission, …). At the same time, the investigation of other rare nuclear physics processes is also possible, such as the two-neutrino double beta decay of 130 Te as well as the rare decays ( 120 Te and 123 Te). Next generation bolometric experiments anticipate top leading sensitivities. The corresponding challenges in the development of ton-scale, low background detectors are highlighted.

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Section: Teo 2 Bolometers For 0νββ Studiesmentioning

confidence: 99%

Neutrinoless Double Beta Decay Experiments With TeO2 Low-Temperature Detectors

2019

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“…The crystals have mechanical and optical characteristics fully compliant with the requirements for the use as thermal detectors. Moreover, the numerous improvements in preparing the TeO 2 powder and in growing the crystals allow the production of almost perfect large specimens (bubblefree, crack-free and twin-free 8 ) from which it is possible to construct bolometers with masses of the order of 750 g [56,57] or more [58,59]. It is fundamental to notice that the use of a material inside a 0νββ detector imposes very stringent constraints in terms of radiopurity.…”

Section: E Properties Of Teo2 Bolometersmentioning

confidence: 99%

Contributed Review: The saga of neutrinoless double beta decay search with TeO2 thermal detectors

Brofferio

Dell’Oro

2018

Review of Scientific Instruments

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Neutrinoless double beta decay (0νββ) is a direct probe of physics beyond the Standard Model. Its discovery would demonstrate that the lepton number is not a symmetry of nature and would provide us with unique information on the nature and mass of the neutrinos. Among the experimental techniques employed in the investigation of this rare process, thermal detectors fulfill the requirements for a powerful search, showing an excellent energy resolution and the possibility of scaling to very large masses. In this work, we review the long chain of bolometric experiments based on TeO 2 crystals that were and continue to be carried out at the Laboratori Nazionali del Gran Sasso (Italy), searching for the 0νββ of 130 Te. We illustrate the progress and improvements achieved in almost thirty years of measurements and compare the various performance and results. We describe the several steps that led to the CUORE detector, the latest of this series and presently in data taking, and we highlight the challenges that a next bolometric experiment will face in order to further improve the sensitivity, especially concerning the background abatement. Finally, we emphasize the advantages of 130 Te in the search for 0νββ with a further future experiment.Published on: Rev. Sci. Instrum. 89, 121502 (2018) CONTENTS

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“…Although bolometers make excellent calorimeters [11,12], achieving FWHM energy resolution as high as 3.9 ± 0.7 keV at 2614.5 keV [11], the phonon signal at the heart of the method shows very little dependence on either the identity of the particle responsible for the underlying energy deposition or on the position of the event in the crystal. Electrons, gammas, αparticles and nuclear recoils depositing the same amount of energy at any point in the bolometer produce virtually identical pulses [13,14].…”

Section: Bolometer Background From Surface and Bulk Radioactivitymentioning

confidence: 99%

Validation of techniques to mitigate copper surface contamination in CUORE

Alessandria,

Ardito,

Artusa

et al. 2012

Preprint

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In this article we describe the background challenges for the CUORE experiment posed by surface contamination of inert detector materials such as copper, and present three techniques explored to mitigate these backgrounds. Using data from a dedicated test apparatus constructed to validate and compare these techniques we demonstrate that copper surface contamination levels better than 10 −7 -10 −8 Bq/cm 2 are achieved for 238 U and 232 Th. If these levels are reproduced in the final CUORE apparatus the projected 90% C.L. upper limit on the number of background counts in the region of interest is 0.02-0.03 counts/keV/kg/y depending on the adopted mitigation technique.

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1.3kg bolometers to search for rare events

Cited by 8 publications

References 14 publications

Neutrinoless Double Beta Decay Experiments With TeO2 Low-Temperature Detectors

Neutrinoless Double Beta Decay Experiments With TeO2 Low-Temperature Detectors

Contributed Review: The saga of neutrinoless double beta decay search with TeO2 thermal detectors

Validation of techniques to mitigate copper surface contamination in CUORE

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