Investigation of shell effects for heavy fissionable nuclei by the blocking technique
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS(2000)
Abstract
The crystal blocking technique has been used to measure delay times in the fission channel for excited nuclei produced in the Si-28 + Pt-nat 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 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. (C) 2000 Elsevier Science B.V. All rights reserved.
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Key words
nuclear reactions Si-28 + Pt-nat,E=140-170 MeV,measured fission fragment angular distributions,U deduced fission characteristics,time delay in the fission channel,blocking technique
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