The formation of nuclides undergoing delayed fission with half-lives in the range of T 1/2 ≳ 1 s has been observed in fusion-evaporation reactions induced by 230 MeV 40 Ca and 40 Ar projectiles on isotopically enriched targets of 144 Sm, 147 Sm and 150 Sm. The fission activity with T 1/2 = 0.70 +0.12 -0.09 s produced in the 144 Sm + 40 Ca reaction has been found to be the most striking one. The origin of this activity is explained as being due to the β-delayed fission occurring in the chain . The discovery of β-delayed fission in the Hg region opens up valuable prospects for extending low-energy ( E * ⩽ Q β + (EC) ) fission studies to neutron-deficient nuclei of many elements belonging to the translanthanide part of the Mendeleev periodic table.
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Lazarev et al. (1987) studied this question.
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