Validation of techniques to mitigate copper surface contamination in CUORE

Abstract

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 10E-07 - 10E-08 Bq/cm2 are achieved for 238U and 232Th. 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.

10 pages, 6 figures, 6 tables

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• Analysis Techniques for the Evaluation of the Neutrinoless Double-Beta Decay Lifetime in ${}^{130}$Te with CUORE-0
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• CUORE-0 detector: design, construction and operation
• CUPID-0: the first array of enriched scintillating bolometers for 0νββdecay investigations
• Background Model of the CUPID-0 Experiment
• RES-NOVA: A new neutrino observatory based on archaeological lead
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• Enriched TeO${}_2$ bolometers with active particle discrimination: towards the CUPID experiment
• Dark matter detection in two easy steps
• First bolometric measurement of the two neutrino double beta decay of ${}^{100}$Mo with a ZnMoO${}_4$ crystals array
• Particle Discrimination in TeO${}_2$ Bolometers using Light Detectors read out by Transition Edge Sensors
• RES-NOVA sensitivity to core-collapse and failed core-collapse supernova neutrinos
• Background suppression in massive TeO${}_2$ bolometers with Neganov-Luke amplified light detectors
• Simulations of background sources in AMoRE-I experiment
• The saga of neutrinoless double beta decay search with TeO2 thermal detectors
• Evaluation and mitigation of trace ${}^{210}$Pb contamination on copper surfaces
• Search for Neutrinoless ${\beta }^{+}EC$ Decay of ${}^{120}$Te with CUORE-0
• The detector calibration system for the CUORE cryogenic bolometer array
• CUPID, the CUORE Upgrade with Particle IDentification
• The 4 K outer cryostat for the CUORE experiment: construction and quality control
• Background identification in cryogenic calorimeters through $\alpha -\alpha$ delayed coincidences
• Alpha backgrounds in the AMoRE-Pilot experiment
• Screener3D: a Gaseous Time Projection Chamber for Ultra-low Radioactive Material Screening
• The CUORE and CUORE-0 experiments at LNGS
• The CUORE and CUORE-0 Experiments at Gran Sasso
• CUORE Opens the Door to Tonne-scale Cryogenics Experiments
• Exploration of Methods to Remove Implanted ${}^{210}$Pb and ${}^{210}$Po Contamination from Silicon Surfaces
• Exploring the keV-scale physics potential of CUORE
• CUORE-0 results and prospects for the CUORE experiment