Fission barriers for the emission of odd-numbered fragments from multicharged C{sub 60} prepared in Ar{sup 8+}-C{sub 60} collisions
- Laboratoire de Spectrometrie Ionique et Moleculaire, Universite Claude Bernard Lyon 1, UMR CNRS No. 5579 43 boulevard du 11 Novembre 1918-69622 Villeurbanne Cedex (France)
We report on measurements of the branching ratios of emission of small C{sub n}{sup +} fragments in asymmetrical fission of highly charged C{sub 60}{sup r+} ions (r=4-6). For the channels corresponding to the emission of one fragment, only small fragments with an even number of carbon atoms are observed. For the channels with the emission of two fragments, successive emission of small fragments with an odd number of carbon atoms has been observed with a surprisingly high branching ratio (30%). In order to reproduce the experimental branching ratios in the framework of a statistical evaporation model, the height of fission barriers for the emission of one odd numbered fragment has to be reduced at higher temperature in order to allow the opening of these channels that are forbidden at lower temperature.
- OSTI ID:
- 20786728
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 73; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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