First observation of α decay of Pt190 to the first excited level (Eexc=137.2 keV) of Os186

P. Belli, R. Bernabei, F. Cappella, R. Cerulli, F. A. Danevich, A. Incicchitti, M. Laubenstein, S. S. Nagorny, S. Nisi, O. G. Polischuk, and V. I. Tretyak
Phys. Rev. C 83, 034603 – Published 9 March 2011

Abstract

The α decays of naturally occurring platinum isotopes, which are accompanied by the emission of γ 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 cm3) during 1815 h. The α decay of Pt190 to the first excited level of Os186 (Jπ=2+, Eexc=137.2 keV) has been observed for the first time, with the half-life determined as T1/2=2.60.3+0.4(stat.)±0.6(syst.)×1014 yr. The T1/2 limits for the α decays of other Pt isotopes have been determined at the level of T1/21016–1020 yr. These limits have been set for the first time or they are better than those known from earlier experiments.

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  • Received 24 December 2010

DOI:https://doi.org/10.1103/PhysRevC.83.034603

©2011 American Physical Society

Authors & Affiliations

P. Belli1, R. Bernabei1,2,*, F. Cappella3,4, R. Cerulli5, F. A. Danevich6, A. Incicchitti3, M. Laubenstein5, S. S. Nagorny6, S. Nisi5, O. G. Polischuk6, and V. I. Tretyak6

  • 1INFN, Sezione di Roma Tor Vergata, I-00133 Rome, Italy
  • 2Dipartimento di Fisica, Università di Roma Tor Vergata, I-00133 Rome, Italy
  • 3INFN, Sezione di Roma La Sapienza, I-00185 Rome, Italy
  • 4Dipartimento di Fisica, Università di Roma La Sapienza, I-00185 Rome, Italy
  • 5INFN, Laboratori Nazionali del Gran Sasso, 67010 Assergi (AQ), Italy
  • 6Institute for Nuclear Research, MSP 03680 Kyiv, Ukraine

  • *rita.bernabei@roma2.infn.it

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Vol. 83, Iss. 3 — March 2011

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