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Title: Investigation of double beta decay of {sup 116}Cd with the help of enriched {sup 116}CdWO{sub 4} crystal scintillators

An experiment to search for 2β processes in {sup 116}Cd with the help of enriched (to 82%) cadmium tungstate crystal scintillators is in progress at the Gran Sasso National Laboratory of the INFN (LNGS, Italy). After 11074 h of data taking in the last configuration, the preliminary estimate for the half-life of 116Cd relatively to 2ν2β decay is T{sub 1/2} = [2.52 ± 0.02(stat.) ± 0.14(syst.)] × 10{sup 19} yr. By using the data of previous stages of the experiment with a similar level of background (≈ 0.1 counts/(keV kg yr) in the energy interval 2.7 – 2.9 MeV; the total time of measurements is 19770 h) we have obtained a new limit on the 0ν2β decay of {sup 116}Cd to the ground state of {sup 116}Sn: T{sub 1/2} ≥ 1.9 × 10{sup 23} yr at 90% C.L. New limits on different 2β processes in {sup 116}Cd (decays with majorons, transitions to the excited levels) are obtained on the level of T{sub 1/2} ≥ 10{sup 20} – 10{sup 22} yr.
Authors:
;  [1] ;  [2] ; ; ;  [3] ; ; ;  [4] ;  [2] ; ; ; ;  [5] ; ; ; ;  [1] ;  [6] ;  [2] more »;  [1] ;  [7] ; ;  [8] « less
  1. Institute for Nuclear Research, MSP 03680 Kyiv (Ukraine)
  2. (Italy)
  3. Institute of Theoretical and Experimental Physics, 117259 Moscow (Russian Federation)
  4. Dipartimento di Fisica, Università di Roma “Tor Vergata”, I-00133 Rome (Italy)
  5. INFN, Laboratori Nazionali del Gran Sasso, I-67100 Assergi (AQ) (Italy)
  6. INFN, sezione di Roma “La Sapienza”, I-00185 Rome (Italy)
  7. (France)
  8. Nikolaev Institute of Inorganic Chemistry, 630090 Novosibirsk (Russian Federation)
Publication Date:
OSTI Identifier:
22492670
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1686; Journal Issue: 1; Conference: MEDEX'15: Workshop on calculation of double-beta-decay matrix elements, Prague (Czech Republic), 9-12 Jun 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CADMIUM 116; CADMIUM TUNGSTATES; CRYSTALS; DOUBLE BETA DECAY; EXCITED STATES; GROUND STATES; HALF-LIFE; MAJORONS; TIN 116