Physics NotePublished
New evaluation of alpha decay half-life of Pt isotope for the Pt-Os dating system
M.L. Terranova; Emil de Lima Medeiros
Publication details
- Authors
- M.L. Terranova; Emil de Lima Medeiros
- Type
- Physics Note
- Status
- Published
- Publication date
- 20/12/2005
- Description
- A semiempirical model based on the quantum mechanical tunnelling mechanism of alpha emission from nuclei has been used to evaluate the half-life of the Pt isotopes. For the important naturally occurring $^{190}$Pt isotope, the radiogenic parent in the $^{190}$Pt$\rightarrow ^{186}$Os dating system, the model yielded a half-life value of $(3.7\pm 0.3)\times 10^{11}$~y. This is comparable to $(3.2\pm 0.1)\times 10^{11}$~y which was obtained in the last direct counting experiment to measure the alpha activity of $^{190}$Pt (Tavares and Terranova, {\em Rad.\ Measurem.\ }{\bf 27} (1997) 19). A literature survey of available alpha decay half-life values for $^{190}$Pt isotope is also reported. The significant discrepancies found between data obtained by direct counting, indirect geological methods and different calculation models are analysed and discussed.
- Year
- 2005
- Number
- CBPF-NF-016/05
- Linked to a thesis
- No
- Linked to a grant
- No