Special properties of 264Fm and of atomic clusters emitting singly charged trimers

Abstract

Neutron-rich 264Fm is an ideal cold fissioning nucleus leading to two identical doubly magic fragments 132Sn. It posses the unique property of having a deep minimum of the shell correction energy at the same mass asymmetry η = 0 as the minimum of the LDM deformation energy. We illustrate this property by comparison with the superheavy nucleus 294118, the cluster emitter 222Ra and the light α-decaying nucleus 106Te. On the other hand, it was experimentally proven that the most important yield in fission of charged metallic atomic clusters is usually obtained when the light fragment is a singly charged trimer (the analog of an α-particle with the magic number of delocalized electrons ne = 2). Our calculations for the fission of Ag2+12, as well as for the fission of Cs2+24, Cs3+45, Cs4+64, Cs5+99, Cs8+208 and Cs10+276 show that in this case both the shell corrections and the LDM deformation energy have minima at the same mass asymmetry which corresponds to the trimer emission. Consequently, charged metallic clusters are ideal emitters of α-clusters.