Volume 77, Number 6, March 2007
Article Number 62001
Number of page(s) 4
Section Nuclear Physics
Published online 02 March 2007
EPL, 77 (2007) 62001
DOI: 10.1209/0295-5075/77/62001

Alpha-decay lifetimes semiempirical relationship including shell effects

D. N. Poenaru1, R. A. Gherghescu1 and N. Carjan2

1  Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH) - RO-077125 Bucharest-Magurele, Romania
2  Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG) - BP 120, F-33175 Gradignan Cedex, France

received 9 October 2006; accepted in final form 5 February 2007; published March 2007
published online 2 March 2007

A new version of the semiempirical formula based on fission approach of alpha decay is derived, by using the optimum values of the fitting parameters determined for even-even nuclei, combined with hindrance factors for even-odd, odd-even, and odd-odd nuclides. The deviations from experimental data for two regions of nuclear chart (493 alpha emitters with $Z=52\hbox{--} 118$ and 142 transuranium nuclei including superheavies ( $Z=92\hbox{--} 118$), respectively) are compared with those obtained by using the universal curve and the Viola-Seaborg semiempirical relationship.

23.60.+e - $\alpha$ decay .
21.10.Tg - Lifetimes .
27.90.+b - Properties of specific nuclei listed by mass ranges: $220 \leqslant A$ .

© Europhysics Letters Association 2007