2007/09/27 by J. Dawson, R. Ramaswamy, Rajiv Ramaswamy +5 · 2 citations
Physics and Astronomy · #Neutrino Physics Research #Nuclear physics research studies #Radioactive Decay and Measurement Techniques #nucl-ex
paper · pdf · doi:10.1016/j.nuclphysa.2007.11.011
published as Nucl.Phys.A799:167-180,2008 · 19 pages, 11 figures
arxiv created 2007/09/27 · openalex publication_date 2007/12/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
For the first time an extensive search for various double beta decay modes of 124Sn and 112Sn has been performed. A total exposure of 43.29 kg.days has been accumulated. New half-life limits of 124Sn into excited states of 124Te have been obtained; the lower half-life limit for the first excited 2+ state at 602.7keV is T1/2 > 3.1 *1018yrs (90 % CL) and for the first excited 0+ state T1/2 > 7.7 *1018yrs (90 % CL). For the very first time, ground state and excited state transitions of 112Sn have been experimentally explored. The obtained half-life limits for ECEC and beta+/EC into the first excited 2+ state of 112Cd are both T1/2 >1.4 *1018yrs (90 % CL). A resonance enhancement in the decay rate for 0nuECEC might be expected for the 0+-state at 1870.9keV due to degeneracy with the 112Sn ground state. No signal was found resulting in a lower half-life limit of T1/2 > 1.6 *1018 yrs (90 % CL) for this decay. As all the excited state searches are based on gamma-lines, all half-life limits apply for both neutrino and neutrino-less modes. Neutrinoless ground state transitions were searched for in the ECEC and beta+/EC mode and a limit of T1/2 > 1.5 *1018 yrs (90 % CL) was obtained for ECEC decays of 112Sn, whilst the beta+/EC mode results are inconclusive.