Abstract
The decays of naturally occurring platinum isotopes, which are accompanied by the emission of quanta, have been searched for deep underground (3600 m water equivalent) at the Gran Sasso National Laboratories of the INFN (Italy). A sample of Pt with a mass of 42.5 g and a natural isotopic composition has been measured with a low background HP Ge detector (468 cm) during 1815 h. The decay of to the first excited level of (, keV) has been observed for the first time, with the half-life determined as yr. The limits for the decays of other Pt isotopes have been determined at the level of –10 yr. These limits have been set for the first time or they are better than those known from earlier experiments.
- Received 24 December 2010
DOI:https://doi.org/10.1103/PhysRevC.83.034603
©2011 American Physical Society