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Fission of Th and U in the interaction with negative muons |
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| Authors: | Dz Ganzorig P G Hansen T Johansson B Jonson J Konijn T Krogulski S M Polikanov G Tibell L Westgaard |
| Institution: | a Joint Institute of Nuclear Research, Dubna, USSR b CERN, Geneva, Switzerland c Institute of Nuclear Research, Swierk, Poland d Department of Chemistry, University of Oslo, Norway |
| Abstract: | Muon-induced fission of 232Th and 238U was studied, measuring the time correlation between stopping muons, fission events and electrons. The measured muon lifetimes are τμ(232Th) = 77.3±0.3 ns and τμ(238U) = 77.1±0.2 ns. After prompt fission the muon was found to be attached predominantly to the heavy fragment with a lifetime for 232Th of 132±7 ns and for 238U of 134±4 ns. The probability for muon conversion was found to be a few percent per fission event. Indications were found that the muonic shape isomer is populated in 238U when the nucleus is excited in a radiationless muonic transition. |
| Keywords: | Nuclear reactions |
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