A search for double- processes in 190Pt and 198Pt was realized with the help of ultra-low background HP Ge 468cm^3 spectrometer in the underground Gran Sasso National Laboratories of the INFN (Italy). After 1815 h of data taking with 42.5g platinum sample, T 1/2 limits on 2 processes in 190Pt ( + and 2 have been established on the level of 1014-1016y, 3 to 4 orders of magnitude higher than those known previously. In particular, a possible resonant double-electron capture in 190Pt was restricted on the level of 2.9×1016 y at 90% C.L. In addition, T 1/2 limit on 2− decay of 198Pt (2 +0) to the 2+ 1 excited level of 198Hg has been set at the first time: T 1/2 > 3.5×1018 y. The radiopurity level of the used platinum sample is reported.
Belli, P., Bernabei, R., Cappella, F., Cerulli, R., Danevich, F., Di Marco, A., et al. (2011). First search for double beta decay of platinum by ultra-low background HP Ge spectrometry,. THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI, 47, 91-98 [10.1140/epja/i2011-11091-6].
First search for double beta decay of platinum by ultra-low background HP Ge spectrometry,
BERNABEI, RITA;
2011-01-01
Abstract
A search for double- processes in 190Pt and 198Pt was realized with the help of ultra-low background HP Ge 468cm^3 spectrometer in the underground Gran Sasso National Laboratories of the INFN (Italy). After 1815 h of data taking with 42.5g platinum sample, T 1/2 limits on 2 processes in 190Pt ( + and 2 have been established on the level of 1014-1016y, 3 to 4 orders of magnitude higher than those known previously. In particular, a possible resonant double-electron capture in 190Pt was restricted on the level of 2.9×1016 y at 90% C.L. In addition, T 1/2 limit on 2− decay of 198Pt (2 +0) to the 2+ 1 excited level of 198Hg has been set at the first time: T 1/2 > 3.5×1018 y. The radiopurity level of the used platinum sample is reported.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.