Observation of Superheavy Nuclei Produced in the Reaction ofK86rwithP208b
| Autor: | W.J. Swiatecki, V. Ninov, Heino Nitsche, Darleane C. Hoffman, J. L. Adams, C. A. Laue, J. B. Patin, Walter Loveland, P. A. Wilk, Diana Lee, Kenneth E. Gregorich, D. A. Shaughnessy, U. W. Kirbach, A. Ghiorso, D. A. Strellis |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 83:1104-1107 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | Following a prediction by Smola\ifmmode \acute{n}\else \'{n}\fi{}czuk [Phys. Rev. C 59, 2634 (1999)], we searched for superheavy element formation in the bombardment of ${}^{208}\mathrm{Pb}$ with 449-MeV ${}^{86}\mathrm{Kr}$ ions. We have observed three decay chains, each consisting of an implanted heavy atom and six subsequent $\ensuremath{\alpha}$ decays, correlated in time and position. In these decay chains, a rapid (ms) sequence of high energy $\ensuremath{\alpha}$ particles ( ${E}_{\ensuremath{\alpha}}\ensuremath{\ge}10\mathrm{MeV}$) indicates the decay of a new high- $Z$ element. The observed chains are consistent with the formation of $^{293}118$ and its decay by sequential $\ensuremath{\alpha}$-particle emission to $^{289}116$, $^{285}114$, $^{281}112$, $^{277}110$, ${}^{273}\mathrm{Hs}$ ( $Z\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}108$) and ${}^{269}\mathrm{Sg}$ ( $Z\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}106$). The production cross section is ${2.2}_{\ensuremath{-}0.8}^{+2.6}\mathrm{pb}$. |
| Databáze: | OpenAIRE |
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