Validation of techniques to mitigate copper surface contamination in CUORE

Alessandria, F.; Ardito, R.; Artusa, D. R.; Avignone, F. T.; Azzolini, O.; Balata, M.; Banks, T. I.; Bari, G.; Beeman, J.; Bellini, F.; Bersani, A.; Biassoni, M.; Bloxham, T.; Brofferio, C.; Bucci, C.; Cai, X. Z.; Canonica, L.; Capelli, S.; Carbone, L.; Cardani, L.; Carrettoni, M.; Casali, N.; Chott, N.; Clemenza, M.; Cosmelli, C.; Cremonesi, O.; Creswick, R. J.; Dafinei, I.; Dally, A.; Datskov, V.; De Biasi, A.; Deninno, M. M.; Di Domizio, S.; di Vacri, M. L.; Ejzak, L.; Faccini, R.; Fang, D. Q.; Farach, H. A.; Ferri, E.; Ferroni, F.; Fiorini, E.; Franceschi, M. A.; Freedman, S. J.; Fujikawa, B. K.; Giachero, A.; Gironi, L.; Giuliani, A.; Goett, J.; Goodsell, A.; Gorla, P.; Gotti, C.; Guardincerri, E.; Gutierrez, T. D.; Haller, E. E.; Han, K.; Heeger, K. M.; Huang, H. Z.; Kadel, R.; Kazkaz, K.; Keppel, G.; Kogler, L.; Kolomensky, Yu. G.; Lenz, D.; Li, Y. L.; Ligi, C.; Liu, X.; Ma, Y. G.; Maiano, C.; Maino, M.; Martinez, M.; Maruyama, R. H.; Mei, Y.; Moggi, N.; Morganti, S.; Napolitano, T.; Newman, S.; Nisi, S.; Nones, C.; Norman, E. B.; Nucciotti, A.; Orio, F.; Orlandi, D.; Ouellet, J. L.; Pallavicini, M.; Palmieri, V.; Pattavina, L.; Pavan, M.; Pedretti, M.; Pessina, G.; Pirro, S.; Previtali, E.; Rampazzo, V.; Reil, R.; Rimondi, F.; Rosenfeld, C.; Rusconi, C.; Sangiorgio, S.; Scielzo, N. D.; Sisti, M.; Smith, A. R.; Sparks, L.; Stivanello, F.; Taffarello, L.; Tenconi, M.; Tian, W. D.; Tomei, C.; Trentalange, S.; Ventura, G.; Vignati, M.; Wang, B. S.; Wang, H. W.; Whitten, C. A.; Wise, T.; Woodcraft, A.; Zanotti, L.; Zarra, C.; Zhu, B. X.; Zucchelli, S.

doi:10.48550/arxiv.1210.1107

Cited by 5 publications

(10 citation statements)

References 14 publications

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“…The upper limit of the surface contamination of the cleaned copper was measured in R&D bolometers to be 1.3 ×10 −7 Bq/cm 2 at 90 % C.L. in both 238 U and 232 Th [18]. CUORE-0 results (sec.…”

Section: Cuorementioning

confidence: 99%

CUORE-0 results and prospects for the CUORE experiment

Artusa¹,

Avignone²,

Azzolini³

et al. 2015

Preprint

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With 741 kg of TeO 2 crystals and an excellent energy resolution of 5 keV (0.2%) at the region of interest, the CUORE (Cryogenic Underground Observatory for Rare Events) experiment aims at searching for neutrinoless double beta decay of 130 Te with unprecedented sensitivity. Expected to start data taking in 2015, CUORE is currently in an advanced construction phase at LNGS. CUORE projected neutrinoless double beta decay half-life sensitivity is 1.6 × 10 26 y at 1σ (9.5 × 10 25 y at the 90 % confidence level), in five years of live time, corresponding to an upper limit on the effective Majorana mass in the range 40-100 meV (50-130 meV). Further background rejection with auxiliary bolometric detectors could improve CUORE sensitivity and competitiveness of bolometric detectors towards a full analysis of the inverted neutrino mass hierarchy. CUORE-0 was built to test and demonstrate the performance of the upcoming CUORE experiment. It consists of a single CUORE tower (52 TeO 2 bolometers of 750 g each, arranged in a 13 floor structure) constructed strictly following CUORE recipes both for materials and assembly procedures. An experiment its own, CUORE-0 is expected to reach a sensitivity to the β β (0ν) half-life of 130 Te around 3×10 24 y in one year of live time. We present an update of the data, corresponding to an exposure of 18.1 kg y. An analysis of the background indicates that the CUORE performance goal is satisfied while the sensitivity goal is within reach.

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Section: Cuorementioning

confidence: 99%

CUORE-0 results and prospects for the CUORE experiment

Artusa¹,

Avignone²,

Azzolini³

et al. 2015

Preprint

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“…Dedicated procedures were developed for the handling and cleaning of each detector component. In particular the cleaning procedure for the copper frames was verified with a dedicated bolometric measurement [15]. To avoid possible recontamination after cleaning, all the detector assembling procedures are performed in glove boxes flushed with nitrogen.…”

Section: The Cuore Experimentsmentioning

confidence: 99%

The CUORE and CUORE-0 Experiments at Gran Sasso

Giachero,

Artusa,

Avignone

et al. 2014

Preprint

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The Cryogenic Underground Observatory for Rare Events (CUORE) is an experiment to search for neutrinoless double beta decay (0νββ) in 130 Te and other rare processes. CUORE is a cryogenic detector composed of 988 TeO 2 bolometers for a total mass of about 741 kg. The detector is being constructed at the Laboratori Nazionali del Gran Sasso, Italy, where it will start taking data in 2015. If the target background of 0.01 counts/(keV•kg•y) will be reached, in five years of data taking CUORE will have an half life sensitivity around 1 × 10 26 y at 90% C.L. As a first step towards CUORE a smaller experiment CUORE-0, constructed to test and demonstrate the performances expected for CUORE, has been assembled and is running. The detector is a single tower of 52 CUORE-like bolometers that started taking data in spring 2013. The status and perspectives of CUORE will be discussed, and the first CUORE-0 data will be presented.

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“…In fact, from the radioactivity point of view, the surface cleaning of the cryostat outer shell is not particularly critical in CUORE since none of these parts are directly facing the bolometers. Unlike the innermost CUORE copper pieces [17] in contact to the detector, here the removal of surface contaminants was achieved by standard metal treatment for industrial applications. Still, degreasers, acids and solvents used during the processing of the metals were pre-selected for radiopurity.…”

Section: Cleaningmentioning

confidence: 99%

The 4K outer cryostat for the CUORE experiment: Construction and quality control

Alessandria

Biassoni

Ceruti

et al. 2013

Nuclear Instruments and Methods in Physics Research Section A:

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The external shell of the CUORE cryostat is a large cryogen-free system designed to host the dilution refrigerator and the bolometers of the CUORE experiment in a low radioactivity environment. The three vessels that form the outer shell were produced and delivered to the Gran Sasso underground Laboratories in July 2012. In this paper, we describe the production techniques and the validation tests done at the production site in 2012.

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Validation of techniques to mitigate copper surface contamination in CUORE

Cited by 5 publications

References 14 publications

CUORE-0 results and prospects for the CUORE experiment

CUORE-0 results and prospects for the CUORE experiment

The CUORE and CUORE-0 Experiments at Gran Sasso

The 4K outer cryostat for the CUORE experiment: Construction and quality control

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