Search for charge non-conserving processes in 127I by coincidence technique

R. Bernabei, P. Belli, F. Cappella, R. Cerulli, C. J. Dai, A. d'Angelo, S. d'Angelo, A. Di Marco, H. L. He, A. Incicchitti, X. H. Ma, F. Montecchia (+3 others)
2012 European Physical Journal C: Particles and Fields  
New lifetime limits on the charge non-conserving (CNC) electron capture with excitation of the 417.9 keV nuclear level in the 127 I are established by using the coincidence technique. The analysed exposure is 0.87 ton × yr, collected deep underground at the Gran Sasso National Laboratory of the INFN by the highly radiopure DAMA/LIBRA setup (≈250 kg of highly radiopure NaI(Tl)). The new limit on the mean life is τ > 1.2 × 10 24 yr (90 % C.L.), about one order of magnitude larger than those
more » ... usly available for CNC electron capture involving nuclear level excitations of 127 I and of the same order of magnitude than those achieved for analogous processes in 129 Xe.
doi:10.1140/epjc/s10052-012-1920-6 fatcat:2fypcay7gffu7hz4jbk7goorsi