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An unified fission model (UFM) has been improved by considering the nuclear deformation effect and introducing an analytical expression of the preformation factor. The improved version of the UFM by considering the nuclear deformation effect is called IMUFM1. Based on the IMUFM1, the further improved version is called IMUFM2 by introducing an analytical expression of the preformation factor. Within the UFM, the IMUFM1 and the IMUFM2, the α decay half-lives of heavy and superheavy nuclei with Z≥92 are systematically calculated. By calculating the standard deviation between the calculated ones and the experimental data, it is found that the accuracy of the IMUFM1 improved 2.45% than this of the UFM. The accuracy of the IMUFM2 will be further improved 32.09% than this of the IMUFM1, which implies the nuclear deformation effect and the preformation factor is important in prediction. Then, the α decay half-lives of Z=118~120 isotopes are predicted within the IMUFM1 and the IMUFM2 by inputting the α decay energies that extracted from the sinite-range droplet model (FRDM), the Weizsäcker-Skyrme-4 (WS4) model and the Koura-Tachibaba-Uno-Yamads (KTUY) formula, respectively. By observing the evolution of the α decay half-lives, it is found that the evolution trends within the mentioned three kinds of mass models are consistent and the shell effect are shown at N=178 and 184, but the order of magnitude are different with the different kinds of mass models. Meanwhile, the dominant decay modes of the superheavy nuclei with N<186 are α decay by comparing the half-lives between α decay and spontaneous fission. So the study of α decay of superheavy nuclei is meaningful. Finally, the decay modes of 296Og, 297119 and 298120 α decay chains are predicted within the IMUFM1 and the IMUFM2 by using these there kinds of mass models, which shown that the predictions within the WS4 and KTUY mass models are more consistent with the experimental measurements. Within the FRDM2012 mass model, although the predictions of 288Fl, 285Nh and 286Fl within the IMUFM1 mass model are not consistent with the experimental measurements, the prediction of 288Fl within the IMUFM2 is good agreement with the experimental measurement, which once again verified the rationality and reliability of the IMUFM2. The predictions of this article might be helpful for identifying new nuclide in future experiments.
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Keywords:
- superheavy nuclei /
- unified fission model /
- α decay /
- spontaneous fission
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