Competition between evaporation channels in neutron-deficient nuclei

Zubov, A. S.; Adamian, G. G.; Antonenko, N. V.; Иванова, С.П.; Scheid, W.

doi:10.1103/physrevc.68.014616

Cited by 67 publications

(27 citation statements)

References 27 publications

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“…case, calculated results change weakly if is con sidered. So, e.g., with change in its value from -1 to +1 MeV, our calculated cross sections of formation of neutron deficient actinides vary by approximately 30% [149,150]. One of possible ways [12,150] to take into account the damping of shell effects with the excitation energy is the introduction of the energy dependence into the microscopic part of fission barrier: (66) where E D is the effective factor of shell effect damping.…”

Section: Calculation Of Level Density In the Fermi Gas Modelmentioning

confidence: 90%

Dinuclear systems in complete fusion reactions

2014

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Formation and evolution of dinuclear systems in reactions of complete fusion are considered. Based on the dinuclear system concept, the process of compound nucleus formation is studied. Arguments confirming the validity of this concept are given. The main problems of describing the complete fusion in adi abatic approximation are listed. Calculations of evaporation residue cross sections in complete fusion reac tions leading to formation of superheavy nuclei are shown. Isotopic trends of the cross sections of heavy nuclei formation in complete fusion reactions are considered.

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Section: Calculation Of Level Density In the Fermi Gas Modelmentioning

confidence: 90%

Dinuclear systems in complete fusion reactions

2014

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“…By using these values and the dinuclear system model [28][29][30][31][32][33][34], one can calculate the evaporation residue cross sections in the complete fusion reactions, which lead to superheavy nuclei. Indeed, the data of Ref.…”

Section: -2mentioning

confidence: 99%

Structures of nuclei inα-decay chains of291,293117

2012

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“…4, but for the nuclei of the α-decay chain of 297 120. The dinuclear system model [39][40][41][42][43][44][45][46][47][48][49] is successful in describing fusion-evaporation reactions especially related to the production of superheavy nuclei. We use this model to calculate the evaporation residue cross-sections σ xn ER .…”

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Impact of nuclear structure on production and identification of new superheavy nuclei

2011

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Abstract. Using the microscopic-macroscopic approach based on the modified two-center shell model, the low-lying quasiparticle spectra, ground-state shell corrections, mass excesses and Q α-values for even Z superheavy nuclei with 108 ≤ Z ≤ 126 are calculated and compared with available experimental data. The predicted properties of superheavy nuclei show that the next doubly magic nucleus beyond 208 Pb is at Z ≥ 120. The perspective of using the actinide-based complete fusion reactions for production of nuclei with Z = 120 is studied for supporting future experiments. Experiments on complete fusion reactions with48 Ca beam and various actinide targets were successfully carried out at FLNR (Dubna), GSI (Darmstadt), and LBNL (Berkeley) in order to synthesize superheavy elements (SHE) with Z = 112-118 [1][2][3][4][5][6][7][8][9][10][11]. The found experimental trend of nuclear properties (Q α -values and half-lives) and cross-sections of production of SHE reveals increasing stability of nuclei approaching the spherical closed neutron shell N = 184, and also indicates a relatively small effect of the proton shell at Z = 114 [3,4,[12][13][14][15] predicted with the microscopic-macroscopic models [16][17][18][19][20][21][22]. This experimental observation seems to be in accordance with the predictions of relativistic and nonrelativistic mean-field models [23][24][25][26] where the island of stability corresponds to Z = 120-126 and N = 184. If there is a strong shell effect at Z = 120-126, then there is hope to synthesize new SHE with Z ≥ 120 by using the present experimental set up and actinide-based reactions with neutron-rich stable projectiles heavier than 48 Ca. With the predictions of the microscopic-macroscopic models [16], where the proton shell at Z = 114 is expected, the reactions 50 Ti+ 249 Cf and 54 Cr+ 248 Cm would result in Z = 120 nuclei with maximum cross-sections of 1.2 and 0.2 fb, respectively, in a 4n evaporation channel [27]. If the predictions of the phenomenological model [28][29][30][31], where the proton shell is assumed at Z = 126, are correct, the reactions 50 Ti+ 249 Cf and 54 Cr+ 248 Cm would lead to the production of Z = 120 nuclei with cross-sections of 550 fb (3n evaporation channel) and 40 fb (4n evaporation channel), respectively [27]. So, the structure of SHE crucially influences the evaporation residue cross-sections in a e-mail: adamian@theor.jinr.ru actinide-based complete fusion reactions. Because nuclear models contain a number of parameters which are fixed for the best description of known nuclei, their predictive power could be smaller for nuclei far from the well-studied region of the nuclear chart. To improve the predictions, one can specially adjust the parameters for describing the known properties of shell-stabilized nuclei close to the region of interest.In refs. [32,33] we proposed a microscopic-macroscopic approach based on the modified two-center shell model (TCSM) [34]. The parameters were set so to describe the spins and parities of the ground state of known heavy nu...

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Competition between evaporation channels in neutron-deficient nuclei

Cited by 67 publications

References 27 publications

Dinuclear systems in complete fusion reactions

Dinuclear systems in complete fusion reactions

Structures of nuclei inα-decay chains of291,293117

Impact of nuclear structure on production and identification of new superheavy nuclei

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