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Experimental investigation of the region of existence of asymmetric fission in light nuclei

Mikhail G. Itkis, V.N. Okolovich, A. Ya. Rusanov, G.N. Smirenkin

Abstract

Mass and energy distributions of fragments in fission of /sup 201/Tl--/sup 209/Bi are measured in reactions induced by protons and ..cap alpha.. particles. These distributions show that the contribution of the asymmetric component observed previously in the nuclei /sup 208/Po--/sup 213/At drops rapidly with decrease of the mass of the nucleus and apparently is cut off at /sup 201/Tl. Thus, a lower limit is established for the region of existence of asymmetric fission: Aapprox. =200, Zapprox. =80. A qualitative interpretation is given for the main properties of the asymmetric fission of preactinide nuclei.

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Key concepts: Fission, Physics, Cluster decay, Nuclear physics, Cold fission, Atomic physics, Fission products, Nuclear fission