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Fragment configurations in multi-cluster fission

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Besides fission into two or three fragments, a heavy or superheavy nucleus spontaneously breaks into four, five or six nuclei, of which two are asymmetric or symmetric heavy fragments and the others are light clusters. Examples are presented for the cold fission of 252Cf, in which the emitted clusters are: 2 [iopmath latex="$\alpha$"] [/iopmath] , [iopmath latex="$\alpha+ {}^{10}$"] + 10 [/iopmath] Be, 3 [iopmath latex="$\alpha$"] [/iopmath] , [iopmath latex="$\rm \alpha + {}^6He + {}^{10}Be$"] + 6He + 10Be [/iopmath] and 4 [iopmath latex="$\alpha$"] [/iopmath] . A comparison is made with the recently observed 252Cf cold binary fission and cold ternary (accompanied by an [iopmath latex="$\alpha$"] [/iopmath] particle or by 10Be cluster) fission. The strong shell effect associated with the doubly magic heavy fragment 132Sn is emphasized. From the analysis of different configurations of fragments we conclude that the most favourable mechanism in such a decay mode should be cluster emission from an elongated neck formed between the two heavy fragments.

Document Type: Miscellaneous

Affiliations: 1: National Institute of Physics and Nuclear Engineering, PO Box MG-6, RO-76900 Bucharest, Romania 2: Institut für Theoretische Physik der Universität, Pf 111932, D-60054 Frankfurt am Main, Germany 3: Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA

Publication date: January 1, 2001


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