Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2004-07-16
Nucl.Phys. A748 (2005) 333-347
Physics
Nuclear Physics
Nuclear Experiment
19 pages, 5 figures, 2 tables
Scientific paper
10.1016/j.nuclphysa.2004.10.025
In the context of the LENS R&D solar neutrino project, the gamma spectrum of a sample of metallic indium was measured using a single experimental setup of 4 HP-Ge detectors located underground at the Gran Sasso National Laboratories (LNGS), Italy. A gamma line at the energy (497.48 +/- 0.21) keV was found that is not present in the background spectrum and that can be identified as a gamma quantum following the beta decay of In-115 to the first excited state of Sn-115 (9/2+ --> 3/2+). This decay channel of In-115, which is reported here for the first time, has an extremely low Q-value, Q = (2 +/- 4) keV, and has a much lower probability than the well-known ground state-ground state transition, being the branching ratio b = (1.18 +/- 0.31) 10^-6. This could be the beta decay with the lowest known Q-value. The limit on charge non-conserving beta decay of In-115 is set at 90% C.L. as tau > 4.1 10^20 y.
Cattadori C. M.
Deo M. de
Laubenstein Matthias
Pandola Luciano
Tretyak Vl. I.
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