Clustering Effects Within the Dinuclear Model

Adamian, G. G.; Antonenko, N. V.; Scheid, W.

doi:10.1007/978-3-642-24707-1_4

Cited by 71 publications

(45 citation statements)

References 120 publications

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“…[8] and the more recent surveys in Refs. [9][10][11]. In binary fission the occurrence of several decay modes is referred to as bimodal or multi-modal fission [3].…”

Section: Binary and Ternary Fission Of 252 Cfmentioning

confidence: 99%

Multi-modal fission in collinear ternary cluster decay of 252 Cf(sf, fff)

2015

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We discuss the multiple decay modes of collinear fission in 252 Cf(sf, fff), with three fragments as suggested by the potential energy surface (PES). Fission as a statistical decay is governed by the phase space of the different decay channels, which are suggested in the PES-landscape. The population of the fission modes is determined by the minima in the PES at the scission points and on the internal potential barriers. The ternary collinear decay proceeds as a sequential process, in two steps. The originally observed ternary decay of 252 Cf(sf) into three different masses (e.g. 132-140 Sn, 52-48 Ca, 68-72 Ni), observed by the FOBOS group in the FLNR (Flerov Laboratory for Nuclear Reactions) of the JINR (Dubna) the collinear cluster tripartition (CCT), is one of the ternary fission modes. This kind of "true ternary fission" of heavy nuclei has often been predicted in theoretical works during the last decades. In the present note we discuss different ternary fission modes in the same system. The PES shows pronounced minima, which correspond to several modes of ternary fragmentations. These decays have very similar dynamical features as the previously observed CCT-decays. The data obtained in the experiments on CCT allow us to extract the yields for different decay modes using specific gates on the measured parameters, and to establish multiple modes of the ternary fission decay.

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“…[8] and the more recent surveys in Refs. [9][10][11]. In binary fission the occurrence of several decay modes is referred to as bimodal or multi-modal fission [3].…”

Section: Binary and Ternary Fission Of 252 Cfmentioning

confidence: 99%

Multi-modal fission in collinear ternary cluster decay of 252 Cf(sf, fff)

2015

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“…This approach to describing the process of complete fusion of nuclei was called the dinuclear sys tem concept (DNS concept) [9][10][11]. Based on this concept, a model of nuclear fusion (DNS model) was proposed and developed that made it possible for the first time to take into account the competition between the complete fusion and quasifission, to explain a large set of experimental data, and to make a number of successful predictions [12][13][14][15][16][17][18][19].…”

Section: Dinuclear Systems In Nuclear Reactionsmentioning

confidence: 99%

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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“…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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confidence: 99%

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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Clustering Effects Within the Dinuclear Model

Cited by 71 publications

References 120 publications

Multi-modal fission in collinear ternary cluster decay of 252 Cf(sf, fff)

Multi-modal fission in collinear ternary cluster decay of 252 Cf(sf, fff)

Dinuclear systems in complete fusion reactions

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

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