New lifetime limits on the charge non-conserving (CNC) electron capture with excitation of the 417.9 keV nuclear level in the 127I 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 isτ >1.2×1024 yr (90 % C.L.), about one order of magnitude larger than those previously available for CNC electron capture involving nuclear level excitations of 127I and of the same order of magnitude than those achieved for analogous processes in 129Xe.
Bernabei, R., Belli, P., Cappella, F., Cerulli, R., Dai, C.j., D’Angelo, A., et al. (2012). Search for charge non-conserving processes in 127I by coincidence technique. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 72, 1920-1-1920-6 [DOI 10.1140/epjc/s10052-012-1920-6].
Search for charge non-conserving processes in 127I by coincidence technique
BERNABEI, RITA;D'ANGELO, SILIO;MONTECCHIA, FRANCESCO;
2012-01-01
Abstract
New lifetime limits on the charge non-conserving (CNC) electron capture with excitation of the 417.9 keV nuclear level in the 127I 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 isτ >1.2×1024 yr (90 % C.L.), about one order of magnitude larger than those previously available for CNC electron capture involving nuclear level excitations of 127I and of the same order of magnitude than those achieved for analogous processes in 129Xe.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
