How Can One Synthesize the Element Z = 120?

Siwek‐Wilczyńska, K.; Cap, T.; Wilczyńskí, J.

doi:10.1142/s021830131001490x

Cited by 43 publications

(32 citation statements)

References 15 publications

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“…[7,8]), we presented results of calculation on the abovementioned reactions which could lead to the Z=120 superheavy element, but we found values of the evaporation residue cross sections lower than 0.1 pb. Predictions of other authors are approximately near this value [9][10][11][12][13]. Therefore, it is necessary to improve the experimental conditions in order to be able to reach measurements of cross sections of the order of fb.…”

Section: Introductionmentioning

confidence: 87%

Investigation of the48Ca + 249–252Cf reactions synthesizing isotopes of the superheavy element 118

et al. 2012

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Section: Introductionmentioning

confidence: 87%

Investigation of the48Ca + 249–252Cf reactions synthesizing isotopes of the superheavy element 118

et al. 2012

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“…For the neighbouring isotope 292 Lv 178 the experimentally predicted fission barrier is also 6.4 MeV and we obtain also almost the same value 6.28 MeV, but estimations based on the FRLDM predict a value of 9.46 MeV, almost 3 MeV larger. As a consequence, such high barriers result in cross sections for Z=114,116,118 and 120 which overestimate the experimental data by several orders of magnitude [86,87]. The ETFSI(SkSC4) model significantly underestimates the barrier heights for 284 Cn 172 and 286 Cn 174 for heavier systems the agreement is however much better.…”

Section: Ws Nl3 Ws Nl3 Ws Nl3mentioning

confidence: 94%

Fission barriers and probabilities of spontaneous fission for elements with Z≥ 100

et al. 2015

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This is a short review of methods and results of calculations of fission barriers and fission halflives of even-even superheavy nuclei. An approvable agreement of the following approaches is shown and discussed: The macroscopic-microscopic approach based on the stratagem of the shell correction to the liquid drop model and a vantage point of microscopic energy density functionals of Skyrme and Gogny type selfconsistently calculated within Hartree-Fock-Bogoliubov method. Mass parameters are calculated in the Hartree-Fock-Bogoliubov cranking approximation. A short part of the paper is devoted to the nuclear fission dynamics. We also discuss the predictive power of Skyrme functionals applied to key properties of the fission path of 266 Hs. It applies the standard techniques of error estimates in the framework of a χ 2 analysis.

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“…A change by a factor of 200 was obtained for the reaction 48 Ca + 249 Cf when the fission barrier of 5.5 MeV [3] was changed by 1 MeV [14]. Also studied was the influence of the fission barrier on the ER cross-section in [15,16].…”

Section: Cross-sectionsmentioning

confidence: 99%

Remarks on the fission barriers of super-heavy nuclei

et al. 2016

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Shell-correction energies determine the stability and the fission barriers of Super-Heavy Nuclei (SHN), the latter being a main factor responsible for their production yield. Although recent experiments performed at FLNR in Dubna (see review articles [1,2]) have confirmed the existence of an island of SHN, the site and strength of highest stability is still uncertain. Predicted Q  values as shown in Fig. 1a reveal the ambiguity. The macroscopic-micro-scopic (MM) models [3,4] predict a closed proton shell at Z = 114 and thus increasing Q  values beyond. The chiral mean-field model (CMF) [5] and the semi-empirical model (SE) [6] predict subshells or shells at 120 and 126, respectively, resulting in less steep or even decreasing Q  values. Experimental data, also shown in Fig. 1a and known up to Z = 116 do not give preference to a specific model. However, decisive information could be obtained from the -decay properties of elements 118 and 120. The following discussion supports our search experiment for element 120. The study also reveals an important uncertainty related to the prediction of cross-sections of the synthesis of SHN. Shell-correction energiesModel dependent experimental shell-correction energies can be deduced from measured nuclear masses by subtraction of theoretically determined liquid-drop masses. In our case, however, absolute experimental nuclear masses are not known, but relative values can be determined for nuclei within an -decay chain using the experimental Q  values. Normalizing these relative masses to the theoretical ones at the end of the decay chain, which is closer to the region of known masses, where relatively good agreement was established [7], results in a reliable approximation of masses up to the heaviest nuclei of the -decay chain. In one case, where a relatively long decay chain starting at 291 Lv and ending at 267 Rf is known, we have performed such an estimate of shell-correction energies. Interestingly, this is the decay chain which would be populated in a 3n channel of the reaction 54 Cr + 248 Cm. In Figs. 1b and 1c, Rf to 279 Ds were normalized by a least squares fit to the theoretical masses. In order to distinguish between the so determined masses, shell-correction energies and fission barriers from the theoretical ones, we denote those 'experimental data' in the following.

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How Can One Synthesize the Element Z = 120?

Cited by 43 publications

References 15 publications

Investigation of the48Ca + 249–252Cf reactions synthesizing isotopes of the superheavy element 118

Investigation of the48Ca + 249–252Cf reactions synthesizing isotopes of the superheavy element 118

Fission barriers and probabilities of spontaneous fission for elements with Z≥ 100

Remarks on the fission barriers of super-heavy nuclei

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