The selection of low-radioactive construction materials is of the utmost importance for rare-event searches and thus critical to the XENONnT experiment. Results of an extensive radioassay program are reported, in which material samples have been screened with gamma-ray spectroscopy, mass spectrometry, and Rn-222 emanation measurements. Furthermore, the cleanliness procedures applied to remove or mitigate surface contamination of detector materials are described. Screening results, used as inputs for a XENONnT Monte Carlo simulation, predict a reduction of materials background (similar to 17%) with respect to its predecessor XENON1T. Through radon emanation measurements, the expected Rn-222 activity concentration in XENONnT is determined to be 4.2 (-(+0.5)(0.7)) mu Bq/kg, a factor three lower with respect to XENON1T. This radon concentration will be further suppressed by means of the novel radon distillation system.

Material radiopurity control in the XENONnT experiment

D'Andrea, V
Membro del Collaboration Group
;
Ferella, A D
Membro del Collaboration Group
;
Macolino, C
Membro del Collaboration Group
;
2022-01-01

Abstract

The selection of low-radioactive construction materials is of the utmost importance for rare-event searches and thus critical to the XENONnT experiment. Results of an extensive radioassay program are reported, in which material samples have been screened with gamma-ray spectroscopy, mass spectrometry, and Rn-222 emanation measurements. Furthermore, the cleanliness procedures applied to remove or mitigate surface contamination of detector materials are described. Screening results, used as inputs for a XENONnT Monte Carlo simulation, predict a reduction of materials background (similar to 17%) with respect to its predecessor XENON1T. Through radon emanation measurements, the expected Rn-222 activity concentration in XENONnT is determined to be 4.2 (-(+0.5)(0.7)) mu Bq/kg, a factor three lower with respect to XENON1T. This radon concentration will be further suppressed by means of the novel radon distillation system.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11697/199678
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 15
social impact