The alpha decay of 117 super heavy nuclei is investigated within the Coulomb and proximity potential model for deformed nuclei. We have performed a systematic search for those isotopes of Z = 117 which may be detectable through experiments via alpha decay. We have predicted 3α chains for 293 117 and 6α chains for 294 117 by the comparison of alpha half-lives and spontaneous fission half-lives and it can be seen that our predictions go hand in hand with the experimental observations. Our study reveals that those isotopes of Z = 117 with A 299 and with A 271 do not survive fission and thus the alpha decay is restricted within the range 272
Abstract.The feasibility for the alpha decay and the heavy particle decay from the even-even superheavy (SH) nuclei with Z = 116-124 have been studied within the Coulomb and proximity potential model (CPPM). The Universal formula for cluster decay (UNIV) of Poenaru et al., the Universal Decay Law (UDL) of Qi et al., and the Scaling Law of Horoi et al., has also been used for the evaluation of the decay half lives. A comparison of our predicted half lives with the values evaluated using these empirical formulas are in agreement with each other and hence CPPM could be considered as a unified model for alpha and cluster decay studies. The spontaneous fission half lives of the corresponding parents have also been evaluated using the semi-empirical formula of Santhosh et al. Within our fission model, we have studied cluster formation probability for various clusters and the maximum cluster formation probability for the decay accompanying 298 114 reveals its doubly magic behavior. In the plots for log 10 (T 1/2 ) against the neutron number of the daughter in the corresponding decay, the half life is found to be the minimum for the decay leading to 298 114(Z = 114, N = 184) and this also indicate its doubly magic behavior. Most of the predicted half lives are well within the present upper limit for measurements ) 10 ( 30 2 / 1 s T < and the computed alpha half lives for 290,292 116 agrees well with the experimental data. We have thus confidently indicate towards a new island for the cluster radioactivity around the superheavy isotope 298 114 and its neighbors and we hope to receive experimental information about the cluster decay half lives of these considered SHs', hoping to confirm the present calculations.
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