Fragmentation potential for the superheavy element 296Lv

Aranghel, D.; Săndulescu, A.

doi:10.1063/1.4909586

Cited by 4 publications

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“…(4)- (11) are resolved. This model was widely used by the Bucharest group in the calculations addressing the cluster [33,34] and alpha decay [35][36][37], the fission [38][39][40], or the heavy element synthesis [41][42][43]. For example, the model was able to describe two tangent nuclei in a wide range of mass asymmetries.…”

Section: Resultsmentioning

confidence: 99%

Inversion of the Odd-Even Effect in Cold Fission from the Time-Dependent Pairing Equations

Mirea

2016

EPJ Web of Conferences

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Abstract.A peculiar phenomenon was observed experimentally in cold fission: the odd partition yields are favored over the even ones for excitations energies of the fragments smaller than 4 MeV. In this contribution, a microscopic model is proposed for the explanation of this odd-even effect in cold fission. This explanation is based on a mixing configuration mechanism that is produced during the fission process. This configuration mixing mechanism is obtained dynamically by solving a the generalized system of time-dependent pairing equations, which include a pair-breaking effect. The time dependent equations of motion for the pair breaking effect were corroborated with a condition that fixes dynamically the number of particles on the two fission fragment. The single particle level scheme was calculated with the Woods-Saxon superasymmetric two center shell model, providing a continuous variation of the single particle energies and of the wave functions from one nucleus up to two separated fragments. A first rule can be extracted from this model. The even-even fission products cannot be obtained at zero excitation energies because of the existence of dynamical excitations produced in the avoided-level-crossing regions when the nuclear system deforms slowly.

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Section: Resultsmentioning

confidence: 99%

Inversion of the Odd-Even Effect in Cold Fission from the Time-Dependent Pairing Equations

Mirea

2016

EPJ Web of Conferences

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“…The competition of different decay modes in heaviest nuclei was studied in detail in recent papers [19,20,21,22].…”

Section: Resultsmentioning

confidence: 99%

Nuclear structure of superheavy elements from alpha decay and fission data

Silişteanu

Anghel

2017

AIP Conference Proceedings

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Alpha and spontaneous fission decay properties of nuclei with 104 < Z < 112 and 158 < N < 166 AIP Conference Proceedings 1796, 020017 (2017) Abstract. This paper brings together the most important aspects of nuclear structure and reaction dynamics that may have an influence on stability of superheavy nuclei. These aspects form the basis of current experimental research on heaviest elements to investigate their basic properties. The shell model is used to estimate microscopically the alpha formation amplitude from single quasiparticle states under the influence of the pairing interaction. Half-life calculations for fission are performed in a dynamical approach defined by the shape and the high of fission barrier, the fissility and nuclear deformations. Reaction energies Q S F are estimated within the liquid drop model. We predicted with the most probable total half-lives for many unknown nuclides at which there are no experimental data. The rms values for experimental and theoretical half-lives are evaluated and discussed. The comparison of theoretical calculations with experimental data allows us to draw conclusions on the role of the nuclear structure and shell effects in low-energy decay processes.

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“…In our calculations, the many-body wave function and the single particle energies are provided by the WoodsSaxon two-center shell model [15]. This model was widely used by the Bucharest group in the calculations addressing the cluster [31,32] and alpha decay [33][34][35], the fission [36][37][38], or the heavy element synthesis [39][40][41][42]. The two center shell model is particularly appropriate for the characterization of scission regions [43].…”

Section: Resultsmentioning

confidence: 99%

Odd-even effect dependence on the excitation energy in low energy fission

Mirea

2017

EPJ Web Conf.

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Abstract. An inversion of the odd-even effect was observed experimentally in cold fission: the odd-odd fragmentation yields are favored over the even-even ones for excitations energies of the fragments smaller than 4 MeV. This effect is linked to the important problem of quasiparticle excitations during the dynamical evolution of the nuclear system from its ground-state configuration up to scission. An explanation based on the Landau-Zener promotion mechanism generalized for superfluid systems is offered for the inversion of the odd-even effect. In principle, the even-even fission products cannot be produced at very low excitation energies due dynamical quasiparticle excitations produced in the avoided-level-crossing regions. These excitations are produced with a large probability when the nuclear system deforms slowly.

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Fragmentation potential for the superheavy element 296Lv

Cited by 4 publications

References 0 publications

Inversion of the Odd-Even Effect in Cold Fission from the Time-Dependent Pairing Equations

Inversion of the Odd-Even Effect in Cold Fission from the Time-Dependent Pairing Equations

Nuclear structure of superheavy elements from alpha decay and fission data

Odd-even effect dependence on the excitation energy in low energy fission

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