Experimental Evidence of Shell Effects in the Fission Time of Heavy Nuclei

The crystal blocking technique has been used to measure delay times in the fission channel for excited nuclei produced in the 28Si+natPt reaction. Experimental results range from 10-17 to 10-18 s at bombarding energies from 140 to 170 MeV. It is shown that fission barriers keep their double-humped s...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2001-03, Vol.70 (3), p.689-695
Main Authors: Yuminov, Oleg A., Platonov, Sergei Yu, Eremenko, Dmitri O., Fotina, Olga V., Fuschini, Enzo, Malaguti, Franco, Vannini, Gianni, Giardina, Giorgio, Fazio, Giovanni, Lamberto, Antonino, Taccone, Anna, Moroni, Arialdo, Fioretto, Enrico, Ricci, Renato A., Vannucci, Luigi, Palamara, Rocco
Format: Article
Language:English
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Summary:The crystal blocking technique has been used to measure delay times in the fission channel for excited nuclei produced in the 28Si+natPt reaction. Experimental results range from 10-17 to 10-18 s at bombarding energies from 140 to 170 MeV. It is shown that fission barriers keep their double-humped structure for nuclear temperature up to 1.7-1.8 MeV, and that the lifetimes of excited states in the second potential well contribute essentially to the observed delay times in the fission channel.
ISSN:0031-9015
1347-4073
DOI:10.1143/JPSJ.70.689