科研之友
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摘要
Within the framework of the dinuclear system model, the influence of mass asymmetry and the isospin effect on the production of exotic actinides have been investigated systematically. The isotopic yields populate in multinucleon transfer reactions of 48Ca, 86Kr, 136Xe, 238U bombarding on 248Cm are analyzed and compared with the available experimental data. Systematics on the production of unknown actinides from Ac to Lr via the available stable elements on Earth (from Ar to U) as projectiles-induced reactions with 232Th, 238U, and 248Cm are investigated thoroughly. Potential-energy surface and total kinetic-energy distribution for the reaction system are calculated and can be used to predict the production cross-section trends. It is found that the heavier projectile leads to the wider isotopic chain distribution for the same target. The heavier target-based reactions prefer to produce plenty of exotic actinides through both mechanisms of deep-inelastic and quasifission reactions. Isospin relaxation plays a crucial role in the colliding process, resulting in an actinide isotopic distribution that tends to shift to the drip lines. Massive new actinides have been predicted at the level of nanobarn to millibarn. The optimal projectile-target combinations and beam energies are proposed for the forthcoming experiments.
