Journal
EUROPEAN PHYSICAL JOURNAL A
Volume 17, Issue 1, Pages 49-56Publisher
SPRINGER-VERLAG
DOI: 10.1140/epja/i2002-10139-0
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stal blocking lifetime measurements have been made for highly excited Th nuclei with neutron number well removed from the stability line. Thin W crystals were bombarded with S-32 ions in the energy range 170-180 Mev and the yield of fission fragments was measured for emission close to a (111) axis. The fission blocking dips are compared to the appropriately scaled ones for elastic scattering of the S-32 beam ions and no significant difference is seen between the dips. This implies that the fraction of nuclei fissioning with lifetimes longer than 10 as is less than 2%. Fission lifetimes are increased by viscosity in the nuclear mass flow and comparison with a statistical model calculation indicates that the viscosity parameter, eta, must be lower than for Th and U nuclei near beta-stability. The effect of the N = 126 magic number is discussed.
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