Pauli blocking effects in 
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-nucleus-induced fusion reactions

Cheng, Kaixuan; Xu, Chang

doi:10.1103/physrevc.102.014619

Cited by 9 publications

(10 citation statements)

References 56 publications

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“…This trend at far sub-barrier energies (no hindrance observed for 58 Ni + 64 Ni) suggests that, as was observed for 40 Ca + 96 Zr, the availability of several states following transfer with Q > 0 effectively counterbalances the Pauli repulsion that, in general, is predicted to reduce the tunneling probability through the Coulomb barrier [125,153].…”

Section: The Ni + Ni Systems and Other Casesmentioning

confidence: 81%

“…[125] (see also Refs. [131,132]). In this model, the authors introduced a new microscopic approach to heavy-ion fusion and demonstrated, on the basis of density-constrained frozen Hartree-Fock calculations, that the main effect of Pauli repulsion is to reduce the tunneling probability inside the Coulomb barrier, thus producing the hindrance.…”

Section: Theoretical Models: Sudden Versus Adiabaticmentioning

confidence: 99%

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Heavy-ion fusion reactions at extreme sub-barrier energies

et al. 2021

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The study of fusion reactions at extreme sub-barrier energies has seen an increased interest in recent years, although difficult to measure due to their very small cross sections. Such reactions are extremely important for our understanding of the production of heavy elements in various environments. In this article, the status of the field is reviewed covering the experimental techniques, the available data, and the theoretical approaches used to describe such reactions. The fusion hindrance effect, first discovered in medium-mass systems, has been found to be relevant also for lighter systems. In some light systems, resonance structures are found to be important, while for heavy systems, the fission process plays an important role. In the near barrier region, couplings to collective excitations in the fusion participants and transfer reactions have been found to give a good description of the measured fusion cross sections and it results in a distribution of fusion barrier heights. New physics ingredients, related to the overlap process of the two projectiles, have to be introduced to describe the hindrance behavior. In addition, it has recently been found that the fusion cross section in both near-barrier and sub-barrier regions can be described very well in many cases using simple, analytical forms of the barrier-height distributions or a modified version of the classic Wong formula.

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Section: The Ni + Ni Systems and Other Casesmentioning

confidence: 81%

Section: Theoretical Models: Sudden Versus Adiabaticmentioning

confidence: 99%

Heavy-ion fusion reactions at extreme sub-barrier energies

et al. 2021

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“…As a reverse quantum tunneling process with fusion, this Pauli blocking potential has been successfully applied to radioactive -cluster decay in heavy nuclei and superheavy nuclei [31][32][33]. Our preliminary studies demonstrate that this Pauli blocking potential can additionally describe the fusion process of -induced and -nucleus-induced reactions well [34][35][36]. However, our previous method was limited in that the projectile must be an nucleus.…”

Section: Pauli Blocking Potential Of a Single Nucleon αmentioning

confidence: 91%

“…More recently, a preliminary work about Pauli blocking effects in -induced and n -nuclei-induced fusion reactions also proposed a good description of the fusion cross sections for + Pb, O + Pb, etc. reactions based on the sudden approximation [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Pauli blocking potential applied to heavy-ion fusion reactions *

Cheng¹,

Xu²,

Ma³

et al. 2022

Chinese Phys. C

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In this study, the Pauli blocking potential between two colliding nuclei in the density overlapping region is applied to describe the heavy nuclei fusion process. Inspired by the Pauli blocking effect in the -decay of heavy nuclei, the Pauli blocking potential of single nucleon from the surrounding matter is obtained. In fusion reactions with strong density overlap, the Pauli blocking potential between the projectile and target can be constructed using a single folding model. By considering this potential, the double folding model with a new parameter set is employed to analyze the fusion processes of 95 systems. A wider Coulomb barrier and shallower potential pocket are formed in the inner part of the potential between the two colliding nuclei, compared to that calculated using the Akyüz-Winther potential. The fusion hindrance phenomena at deep sub-barrier energies are described well for fusion systems O + Pb and Ni + Ni.

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“…In this approach, however, the effect of other momentum dependent terms as well as the spin-orbit interaction of the effective nucleon-nucleon interaction on the Pauli repulsion are not accounted for. A folding density method for α-clusters has also been developed recently [26,27]. Attempts were made with the resonating group method [28][29][30][31] which, in principle, provides a theoretical approach to construct internuclear potentials with full antisymmetrization.…”

Section: Introductionmentioning

confidence: 99%

Pauli energy contribution to nucleus-nucleus interaction

Umar,

Simenel,

Godbey

2021

Preprint

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Background: The Pauli exclusion principle plays a crucial role as a building block of many-body quantal systems comprised of fermions. It also induces a "Pauli repulsion" in the interaction between di-nuclear systems. It has been shown in [Phys. Rev. C95, 031601 (2017)] that the Pauli repulsion widens the nucleus-nucleus potential barrier, thus hindering sub-barrier fusion. Purpose: To investigate the proton and neutron contributions to the Pauli repulsion, both in the bare potential neglecting shape polarization and transfer between the reactants, as well as in the dynamical potential obtained by accounting for such dynamical rearrangements. Methods: As the basis of our study we utilize the Pauli kinetic energy (PKE) obtained by studying the nuclear localization function (NLF). Recently this approach has been generalized to incorporate all of the dynamical and time-odd terms present in the nuclear energy density functional. This approach is employed in the density constrained Hartree-Fock (DCFHF) and in the density constrained time-dependent Hartree-Fock (DC-TDHF) microscopic methods. Results: The PKE spatial distribution shows that a repulsion occurs in the neck between the nuclei when they first touch. Inside the barrier, neutrons can contribute significantly more to the Pauli repulsion in neutron-rich systems. Dynamical effects tend to lower the Pauli repulsion near the barrier. Proton and neutron dynamical contributions to the PKE significantly differ inside the barrier for asymmetric collisions, which is interpreted as an effect of multinucleon transfer. Conclusions: The PKE is shown to make a significant contribution to nuclear interaction potentials. Protons and neutrons can play very different roles in both the bare potential and in the dynamical rearrangement. Further microscopic studies are required to better understand the role of transfer and to investigate the effect of pairing and deformation.

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Pauli blocking effects in nα -nucleus-induced fusion reactions

Cited by 9 publications

References 56 publications

Heavy-ion fusion reactions at extreme sub-barrier energies

Heavy-ion fusion reactions at extreme sub-barrier energies

Pauli blocking potential applied to heavy-ion fusion reactions *

Pauli energy contribution to nucleus-nucleus interaction

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