Fluctuation-dissipation model for synthesis of superheavy elements

Aritomo, Y.; Wada, Takahiro; Ohta, M.; Abe, Yasuhisa

doi:10.1103/physrevc.59.796

Cited by 125 publications

(87 citation statements)

References 52 publications

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“…For SHE, this barrier has only a quantum nature and vanishes at high excitation energy. E d ≃ 20 MeV is the shell damping energy [58]. We consider that a CN with an excitation energy between E * 1 and E * 0 decays only by fission or neutron emission.…”

Section: Fusion/evaporation Cross Sections Of Heavy Nucleimentioning

confidence: 99%

“…The parameters ω 0 and ω S are the oscillator frequencies of the two parabolas approximating the potential V (x) in the first minimum and at the saddle point respectively. The variable x is related to the distance between the mass centers of the nascent fission fragments (see [58]) and β = 5 × 10 21 s −1 is the reduced friction. Eq.…”

Section: Fusion/evaporation Cross Sections Of Heavy Nucleimentioning

confidence: 99%

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Fusion process studied with a preequilibrium giant dipole resonance in time-dependent Hartree-Fock theory

2007

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The equilibration of macroscopic degrees of freedom during the fusion of heavy nuclei, like the charge and the shape, are studied in the Time-Dependent Hartree-Fock theory. The preequilibrium Giant Dipole Resonance (GDR) is used to probe the fusion path. It is shown that such isovector collective state is excited in N/Z asymmetric fusion and to a less extent in mass asymmetric systems. The characteristics of this GDR are governed by the structure of the fused system in its preequilibrium phase, like its deformation, rotation and vibration. In particular, we show that a lowering of the preequilibrium GDR energy is expected as compared to the statistical one. Revisiting experimental data, we extract an evidence of this lowering for the first time. We also quantify the fusion-evaporation enhancement due to γ-ray emission from the preequilibrium GDR. This cooling mechanism along the fusion path may be suitable to synthesize in the future super heavy elements using radioactive beams with strong N/Z asymmetries in the entrance channel.

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Section: Fusion/evaporation Cross Sections Of Heavy Nucleimentioning

confidence: 99%

Section: Fusion/evaporation Cross Sections Of Heavy Nucleimentioning

confidence: 99%

Fusion process studied with a preequilibrium giant dipole resonance in time-dependent Hartree-Fock theory

2007

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“…Nevertheless, until now the different considerations of the entrance channel and the processes of CN formation, quasi-fission and fission are commonly used. In [18,19] the Langevin equations were used for description of evolution of the system after contact of two nuclei. In [5] the master equation was proposed and used in [12,14] to describe approximately the overdamped evolution of the system in the (z 1 , n 1 , δ 1 ; z 2 , n 2 , δ 2 ) space.…”

Section: Equations Of Motion ?mentioning

confidence: 99%

Fusion-Fission Dynamics of Super-Heavy Element Formation and Decay

Zagrebaev¹

2004

AIP Conference Proceedings

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Abstract. The paper is focused on reaction dynamics of super-heavy nucleus formation and decay at beam energies near the Coulomb barrier. The aim is to review the things we have learned from recent experiments on fusion-fission reactions leading to the formation of compound nuclei with Z ≥ 102 and from their extensive theoretical analysis. Main attention is paid to the dynamics of formation of very heavy compound nuclei taking place in strong competition with the process of fast fission (quasi-fission). The choice of collective degrees of freedom playing a principal role, finding the multi-dimensional driving potential and the corresponding dynamic equation regulating the whole process are discussed. Theoretical predictions are made for synthesis of SH nuclei up to Z=120 in the asymmetric "hot" fusion reactions basing on use of the heavy transactinide targets.

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“…12 C or 16 O, where polar collisions at low beam energy result in enhanced sub-barrier fusion, to heavier projectiles like 48 Ca just described, as function of the projectile mass and charge [138]. Triggered by the recent experimental success of heavy element synthesis, a number of theoretical studies were performed or are in progress, aiming to obtain a detailed quantitative understanding of the reaction processes involved in heavy element synthesis [117,118,133,137,[139][140][141][142][143][144][145][146][147][148][149][150][151][152]. Although a realistic fusion scenario is not yet available and not all details of the fusion process resulting in SHE's are completely understood, we already can investigate various reactions concerning the Q-value, including radioactive projectiles.…”

Section: Properties Of Cold-fusion Reactionsmentioning

confidence: 99%

Synthesis of superheavy elements by cold fusion

Hofmann¹

2011

Radiochimica Acta

131

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Summary.The new elements from Z = 107 to 112 were synthesized in cold fusion reactions based on targets of lead and bismuth. The principle physical concepts are presented which led to the application of this reaction type in search experiments for new elements. Described are the technical developments from early mechanical devices to experiments with recoil separators. An overview is given of present experiments which use cold fusion for systematic studies and synthesis of new isotopes. Perspectives are also presented for the application of cold fusion reactions in synthesis of elements beyond element 113, the so far heaviest element produced in a cold fusion reaction. Further, the transition of hot fusion to cold fusion is pointed out, which occurs in reactions for synthesis of elements near Z = 126 using actinide targets and beams of neutron rich isotopes of elements from iron to germanium.

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Fluctuation-dissipation model for synthesis of superheavy elements

Cited by 125 publications

References 52 publications

Fusion process studied with a preequilibrium giant dipole resonance in time-dependent Hartree-Fock theory

Fusion process studied with a preequilibrium giant dipole resonance in time-dependent Hartree-Fock theory

Fusion-Fission Dynamics of Super-Heavy Element Formation and Decay

Synthesis of superheavy elements by cold fusion

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