New studies on the radiopurity and performances of Cs₂ZrCl₆ crystal scintillators

In this work, we present new studies by using different materials and procedures to improve the performances and radiopurity of Cs 2 ZrCl 6 (CZC) crystal scintillators. In particular, measurements of three new CZC crystals as scintillators were performed over 97.7 days live-time in the low-background DAMA/CRYS set-up deep underground at the Gran Sasso National Laboratory (LNGS) of the I.N.F.N. They allow us to derive elements for improvements towards a possible future use of this kind of detectors in the search for neutrino-less double beta decay of 94,96 Zr and rare single beta decay of 96 Zr.