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- Title
New limit on 94Zr double beta decay to the 1st excited state of 94Mo.
- Authors
Celi, E.; Ješkovský, M.; Laubenstein, M.; Nagorny, S. S.; Nahorna, V. V.; Nisi, S.; Pagnanini, L.; Povinec, P.; Wang, P.
- Abstract
A new study of double beta decay processes in natural Zr isotopes using Zr metal samples and an ultra-low-background high-purity germanium detectors was performed at Laboratori Nazionali del Gran Sasso of INFN (Italy). Two data sets were collected with a 736.35 g and a 129.94 g Zr metal over 59.7 days and 37.3 days, respectively, and were used for a detailed analysis. A new limit on the double beta decay of 94 Zr to the 1st excited level of 94 Mo was set as T 1 / 2 β β > 2.1 × 10 20 year , which is a factor of three better than the previous result. It is shown that the current radiopurity of Zr metal (tens of Bq/kg), produced via two methods, do not comply with the radiopurity requirements for low-background experiments. Hence, we propose to use a purified ZrCl 4 powder in an optimized geometry as a new approach for future experiments with extended sensitivity focused on studies of rare nuclear processes in Zr isotopes.
- Subjects
DOUBLE beta decay; EXCITED states; NEUTRINOLESS double beta decay; BETA decay; GERMANIUM detectors; RADIOCHEMICAL purification
- Publication
European Physical Journal C -- Particles & Fields, 2023, Vol 83, Issue 5, p1
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-023-11516-9