Influence of proton shell closure on the evaporation residue cross sections of superheavy nuclei

Abstract

Within the dinuclear system model we systematically calculate the evaporation residue cross sections (ERCSs) of superheavy nuclei (SHN) for the 48Ca-induced hot fusion reactions. Different calculations of the fission barriers of the SHN are used. The difference is as large as two orders of magnitude of ERCSs by applying the various fission barriers for the reaction 48Ca+249Cf. The dependence of the calculated ERCSs on the predicted shell structure and magic numbers of the heavier SHN is discussed. It is found that the structure of SHN crucially influences the ERCSs. Measurement of ERCSs for at least one isotope of the nucleus would help us to set a proper shell model for the SHN with 118.

Search for the heaviest atomic nuclei among the products from reactions of mixed-Cf with a Ca48 beam

“…For those references [16,17] which quote values in the centerof-mass frame, the masses from [18] have been used for conversion. This maintains consistency with references [19][20][21][22] which are using masses from [18] and do not differ from the current evaluation [23] when based upon experimental numbers. The predicted cross-sections across the listed parameter space varies between 1 fb and 100 pb.…”

“…Further considered, but not shown in Table II, are references [19,20,22] which include predictions about reactions on 249 Cf. Significant effort is given in [22] to detail the effect of various inputs on the reaction and shows 1 pb or greater ERCS's for the favored 3n exit channel.…”

“…Further considered, but not shown in Table II, are references [19,20,22] which include predictions about reactions on 249 Cf. Significant effort is given in [22] to detail the effect of various inputs on the reaction and shows 1 pb or greater ERCS's for the favored 3n exit channel. If references [19,26] are taken together this also gives a positive outlook on the possibility of running with 48 Ca on 249 Cf and 251 Cf, indicating 3n neutron evaporation as most likely and producing both 294 Og and 296 Og with ERCSs of around 1 pb.…”

Fusion Dynamics of Low-Energy Heavy-Ion Collisions for Production of Superheavy Nuclei

“…On one hand, the survival probability of the compound nucleus was very sensitive to the fission barrier. However, the difference in fission barriers of superheavy nuclei calculated by different models was obvious not only due to the absolute values but also the trends with charge number Z [2,85]. On the other hand, due to different assumptions, the fusion probability calculated by different models was significantly different for synthesis Z = 119 and 120 [84].…”

“…For the low-energy heavy-ion collision, the capture cross section from the sub-barrier region to above the Coulomb barrier is an important issue for theoretical and experimental studies [78][79][80][81][82][83]. One of reasons is that the overall uncertainties in predicting superheavy nuclei production are associated with the calculations of capture cross sections [50, 84,85].…”