First observation of {alpha} decay of {sup 190}Pt to the first excited level (E{sub exc}=137.2 keV) of {sup 186}Os

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.034603· OSTI ID:21499497

Belli, P ^[1]; Bernabei, R ^[1]; Cappella, F ^[2]; Cerulli, R; Laubenstein, M; Nisi, S ^[3]; Danevich, F A; Nagorny, S S; Polischuk, O G; Tretyak, V I ^[4]; Incicchitti, A ^[2]

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

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 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{sup 3}) during 1815 h. The {alpha} decay of {sup 190}Pt to the first excited level of {sup 186}Os (J{sup {pi}}=2{sup +}, E{sub exc}=137.2 keV) has been observed for the first time, with the half-life determined as T{sub 1/2}=2.6{sub -0.3}{sup +0.4}(stat.){+-}0.6(syst.)x10{sup 14} yr. The T{sub 1/2} limits for the {alpha} decays of other Pt isotopes have been determined at the level of T{sub 1/2}{approx_equal}10{sup 16}-10{sup 20} yr. These limits have been set for the first time or they are better than those known from earlier experiments.

• OSTI ID: 21499497
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevC.83.034603; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY
EMISSION
EXCITED STATES
GE SEMICONDUCTOR DETECTORS
HALF-LIFE
ISOTOPE RATIO
KEV RANGE
MASS
OSMIUM 186
PLATINUM 190
UNDERGROUND
WATER
ALPHA DECAY RADIOISOTOPES
DECAY
DIMENSIONLESS NUMBERS
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
HEAVY NUCLEI
HYDROGEN COMPOUNDS
ISOTOPES
LEVELS
MEASURING INSTRUMENTS
NUCLEAR DECAY
NUCLEI
OSMIUM ISOTOPES
OXYGEN COMPOUNDS
PLATINUM ISOTOPES
RADIATION DETECTORS
RADIOISOTOPES
SEMICONDUCTOR DETECTORS
STABLE ISOTOPES
YEARS LIVING RADIOISOTOPES