Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2011-02-13
Phys.Rev.C83:034603,2011
Physics
Nuclear Physics
Nuclear Experiment
12 pages, 3 figures, accepted for publication on Phys. Rev. C
Scientific paper
10.1103/PhysRevC.83.034603
The alpha decays of naturally occurring platinum isotopes, which are accompanied by the emission of gamma quanta, have been searched for deep underground (3600 m w.e.) in the Gran Sasso National Laboratories of the INFN (Italy). A sample of Pt with mass of 42.5 g and a natural isotopic composition has been measured with a low background HP Ge detector (468 cm^3) during 1815 h. The alpha decay of 190-Pt to the first excited level of 186-Os (J^\pi = 2^+, E_{exc}=137.2 keV) has been observed for the first time, with the half-life determined as: T_{1/2} = 2.6_{-0.3}^{+0.4} (stat.) \pm 0.6 (syst.) \times 10^{14} yr. The T_{1/2} limits for the alpha decays of other Pt isotopes have been determined at level of T_{1/2} \simeq 10^{16}-10^{20} yr. These limits have been set for the first time or they are better than those known from earlier experiments.
Belli P.
Bernabei R.
Cappella F.
Cerulli Ricardo
Danevich F. A.
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