A low background experiment to search for the double β decay of 116Cd is in progress at the Gran Sasso National Laboratories of the INFN (Italy) by using 116CdWO4 crystal scintillators (≈ 1.2 kg) enriched in 116Cd to 82 %. The energy resolution of the detector is FWHM ≈ 5.5% at Q2β of 116Cd (2813 keV); the background rate is 0.28 counts/(yr × keV × kg) in the 2.7–2.9 MeV energy range. After ≈ 1 kg × yr of data taking, the half-life of 116Cd relatively the 2ν2β decay was measured as T1/2 = (2.5 ± 0.5) × 1019 yr and new improved limits on the 2β decay of 116Cd to few excited levels of 116Sn were set at level of 1021 - 1022 yr. In particular, 2ν2β transitions to 2+ states (2112 and 2225 keV) of 116Sn were restricted as T1/2 ≥ 6.0 × 1020 yr and T1/2 ≥ 6.7 × 1020 yr at 90% C.L., respectively, that is approximately one order of magnitude higher than those previously established.
Barabash, A.s., Belli, P., Bernabei, R., Cappella, F., Caracciolo, V., Castellano, S., et al. (2013). First results of the experiment to search for double beta decay of 116Cd with the help of enriched 116CdWO4 crystal scintillators. In The 4-th International Conference : Current Problems in Nuclear Physics and Atomic Energy (NPAE-Kyiv2012) (pp.353-356). National Academy of Sciences of Ukraine.
First results of the experiment to search for double beta decay of 116Cd with the help of enriched 116CdWO4 crystal scintillators
Bernabei, R.;Caracciolo, V.;
2013-01-01
Abstract
A low background experiment to search for the double β decay of 116Cd is in progress at the Gran Sasso National Laboratories of the INFN (Italy) by using 116CdWO4 crystal scintillators (≈ 1.2 kg) enriched in 116Cd to 82 %. The energy resolution of the detector is FWHM ≈ 5.5% at Q2β of 116Cd (2813 keV); the background rate is 0.28 counts/(yr × keV × kg) in the 2.7–2.9 MeV energy range. After ≈ 1 kg × yr of data taking, the half-life of 116Cd relatively the 2ν2β decay was measured as T1/2 = (2.5 ± 0.5) × 1019 yr and new improved limits on the 2β decay of 116Cd to few excited levels of 116Sn were set at level of 1021 - 1022 yr. In particular, 2ν2β transitions to 2+ states (2112 and 2225 keV) of 116Sn were restricted as T1/2 ≥ 6.0 × 1020 yr and T1/2 ≥ 6.7 × 1020 yr at 90% C.L., respectively, that is approximately one order of magnitude higher than those previously established.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
