1. New observation of 2β2νdecay of100Mo to the 0+1level of100Ru in the ARMONIA1experiment
- Author
-
P. Belli, V. I. Tretyak, S. d'Angelo, R. S. Boiko, R. Cerulli, O. G. Polischuk, B. N. Kropivyansky, Matthias Laubenstein, R. Bernabei, V.V. Kobychev, I. M. Vyshnevskyi, F.A. Danevich, P.G. Nagornyi, D. Prosperi, S.S. Yurchenko, F. Cappella, S. S. Nagorny, Stefano Nisi, F. Nozzoli, D.V. Poda, and A. Incicchitti
- Subjects
Nuclear physics ,Physics ,History ,chemistry ,Molybdenum ,Excited state ,Half-life ,chemistry.chemical_element ,Atomic physics ,Coincidence ,Computer Science Applications ,Education - Abstract
Sample of 100MoO3 with molybdenum enriched in 100Mo to 99.5% and mass of 1199 g was measured deep underground (3600 m w.e.) in the Laboratori Nazionali del Gran Sasso of INFN, Italy; during 17249 h with a low-background set-up with 4 HP Ge detectors. After 2β2ν decay of 100Mo to the 0+1 excited level of 100Ru (Eexc = 1131 keV), two γ quanta of 540 keV and 591 keV should be emitted in deexcitation process. Both these γ's are observed in the accumulated data as in coincidence spectrum as well in 1-dimensional sum spectrum. Measured half life is T1/2 = (7.0+1.1−0.8) × 1020 yr, in agreement with positive results obtained in previous experiments.
- Published
- 2010