A radiopure cadmium tungstate crystal scintillator, enriched in Cd106 to 66%, with mass of 216 g (Cd106WO4), was used to search for double-β decay processes in Cd106 in coincidence with four ultra-low-background high-purity germanium detectors in a single cryostat. Improved limits on the double-β processes in Cd106 have been set on the level of 1020−1021 yr after 13 085 h of data taking. In particular, the half-life limit on the two-neutrino electron capture with positron emission, T2νɛβ+1/2≥1.1×1021 yr, has reached the region of theoretical predictions. With this half-life limit the effective nuclear matrix element for the 2νɛβ+ decay is bounded as M2νɛβ+eff≤1.1. The resonant neutrinoless double-electron captures to the 2718-, 2741-, and 2748-keV excited states of Pd106 are restricted at the level of T1/2≥(8.5×1020−1.4×1021) yr.

Belli, P., Bernabei, R., Brudanin, V., Cappella, F., Caracciolo, V., Cerulli, R., et al. (2016). Search for 2β decay of 106Cd with enriched 106CdW4 crystal scintillator in coincidence with four HPGe detectors. PHYSICAL REVIEW C, 93(4), 045502-1-045502-10 [10.1103/PhysRevC.93.045502].

Search for 2β decay of 106Cd with enriched 106CdW4 crystal scintillator in coincidence with four HPGe detectors

BERNABEI, RITA;Caracciolo, V;D'ANGELO, SILIO;
2016-04

Abstract

A radiopure cadmium tungstate crystal scintillator, enriched in Cd106 to 66%, with mass of 216 g (Cd106WO4), was used to search for double-β decay processes in Cd106 in coincidence with four ultra-low-background high-purity germanium detectors in a single cryostat. Improved limits on the double-β processes in Cd106 have been set on the level of 1020−1021 yr after 13 085 h of data taking. In particular, the half-life limit on the two-neutrino electron capture with positron emission, T2νɛβ+1/2≥1.1×1021 yr, has reached the region of theoretical predictions. With this half-life limit the effective nuclear matrix element for the 2νɛβ+ decay is bounded as M2νɛβ+eff≤1.1. The resonant neutrinoless double-electron captures to the 2718-, 2741-, and 2748-keV excited states of Pd106 are restricted at the level of T1/2≥(8.5×1020−1.4×1021) yr.
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Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - Fisica Nucleare e Subnucleare
English
Con Impact Factor ISI
double beta decay; HPGe; 106Cd;
http://journals.aps.org/prc/recent
Belli, P., Bernabei, R., Brudanin, V., Cappella, F., Caracciolo, V., Cerulli, R., et al. (2016). Search for 2β decay of 106Cd with enriched 106CdW4 crystal scintillator in coincidence with four HPGe detectors. PHYSICAL REVIEW C, 93(4), 045502-1-045502-10 [10.1103/PhysRevC.93.045502].
Belli, P; Bernabei, R; Brudanin, V; Cappella, F; Caracciolo, V; Cerulli, R; Chernyak, D; Danevich, Fa; D'Angelo, S; Di Marco, A; Incicchitti, A; Laubenstein, M; Mokina, V; Poda, D; Polischuk, O; Tretyak, V; Tupitsyna, I
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/142641
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