Examining the role of transfer coupling in sub-barrier fusion of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi>Ti</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>46</mml:mn><mml:mo>,</mml:mo><mml:mn>50</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mmultiscripts><mml:mi>Sn</mml:mi><mml:mprescripts /><mml:none /><mml:mn>124</mml:mn></mml:mmultiscripts></mml:mrow></mml:math>

Liang, J. F.; Allmond, J. M.; Gross, C. J.; Mueller, P. E.; Shapira, D.; Varner, R. L.; Dasgupta, M.; Hinde, David; Simenel, C.; Williams, E.; Vo-Phuoc, K.; Brown, Michael L.; Carter, I. P.; Evers, M.; Luong, D. H.; Ebadi, Toktam; Wakhle, A.

doi:10.1103/physrevc.94.024616

Cited by 24 publications

(13 citation statements)

References 37 publications

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“…One explanation is that the dynamics will "wash out" the static structure effects such as the Coulomb barrier lowering due to neutron skin [30]. This anomaly was also studied in a recent experiment [31].In this work we address the impact of isospin dynamics on fusion barriers and cross-sections using the microscopic timedependent Hartree-Fock (TDHF) theory [32,33] together with the density-constrained TDHF (DC-TDHF) method for calculating fusion barriers [34]. In the TDHF approximation the many-body wavefunction is replaced by a single Slater determinant and this form is preserved at all times, implying that two-body correlations are neglected.…”

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confidence: 83%

Dependence of fusion on isospin dynamics

2017

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We introduce a new microscopic approach to calculate the dependence of fusion barriers and cross-sections on isospin dynamics. The method is based on the time-dependent Hartree-Fock theory and the isoscalar and isovector properties of the energy density functional (EDF). The contribution to the fusion barriers originating from the isoscalar and isovector parts of the EDF is calculated. It is shown that for non-symmetric systems the isovector dynamics influence the sub-barrier fusion cross-sections. For most systems this results in an enhancement of the sub-barrier cross-sections, while for others we observe differing degrees of hindrance. We use this approach to provide an explanation of recently measured fusion cross sections which show a surprising enhancement at low $E_\mathrm{c.m.}$ energies for the system $^{40}$Ca+$^{132}$Sn as compared to the more neutron-rich system $^{48}$Ca+$^{132}$Sn, and discuss the dependence of sub-barrier fusion cross-sections on transfer.Comment: 5 pages, 4 figure

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confidence: 83%

Dependence of fusion on isospin dynamics

2017

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“…Recent TDHF studies have been performed to investigate the charge equilibration in deep-inelastic collisions [46,48] and its impact on the interplay between fusion and transfer reactions [49][50][51][52][53][54]. Recent investigations have also shown that the one-body dissipation mechanisms included in TDHF were the most relevant to describe fully damped reactions such as quasi-fission [55][56][57][58][59][60].…”

Section: Introductionmentioning

confidence: 99%

Transport properties of isospin asymmetric nuclear matter using the time-dependent Hartree-Fock method

Umar

Simenel

2017

Phys. Rev. C

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Background: The study of deep-inelastic reactions of nuclei provide a vehicle to investigate nuclear transport phenomena for a full range of equilibration dynamics. These inquires provide us the ingredients to model such phenomena and help answer important questions about the nuclear Equation of State (EOS) and its evolution as a function of neutron-to-proton (N/Z) ratio.Purpose: The motivation is to examine the real-time dynamics of nuclear transport phenomena and its dependence on (N/Z) asymmetry from a microscopic point of view to avoid any pre-conceived assumptions about the involved processes.Method: Time-dependent Hartree-Fock (TDHF) method in full 3D is employed to calculate deep-inelastic reactions of 78 Kr+ 208 Pb and 92 Kr+ 208 Pb systems at 8.5 MeV/A. The impact parameter and energy-loss dependence of relevant observables are calculated. In addition, density constrained TDHF method is used to compute excitation energies of the primary fragments. The statistical deexcitation code GEMINI is utilized to examine the final reaction products.Results: The kinetic energy loss and sticking times as a function of impact parameter are calculated. Final properties of the fragments (charge, mass, scattering angle, kinetic energy) are computed. Their evolution as a function of energy loss is studied and various intra-relations are investigated. The fragment excitation energy sharing is computed. Conclusions:We find a smooth dependence of the energy loss, E loss , on the impact parameter for both systems. On the other hand the transfer properties for low E loss values are very different for the two systems but become similar in the higher E loss regime. The mean life time of the charge equilibration process, obtained from the final (N − Z)/A value of the fragments, is shown to be ∼ 0.5 zs. This value is slightly larger (but of the same order) than the value obtained from reactions at Fermi energies.

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“…In addition, collective vibrations can appear built on any shape of the system during its path to fusion. In particular, the pre-equilibrium giant dipole resonance, which is excited in N/Z asymmetric collisions, has been studied in detail with modern TDHF codes [51][52][53]. It has been shown that the properties of the pre-equilibrium GDR could be used to infer the characteristics of the system on its path to fusion.…”

Section: Path To Fusion In Light Systemsmentioning

confidence: 99%

“…We then used this technique to investigate the impact of transfer on heavier systems where experimental signatures are not so clear [4,53]. The isovector reduction of the potential due to transfer channels depends naturally on the presence of positive Q−value transfer channels.…”

Section: (Isovector) Transfer Couplingsmentioning

confidence: 99%

Effect of Pauli repulsion and transfer on fusion

et al. 2017

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Abstract. The e↵ect of the Pauli exclusion principle on the nucleus-nucleus bare potential is studied using a new density-constrained extension of the Frozen-Hartree-Fock (DCFHF) technique. The resulting potentials exhibit a repulsion at short distance. The charge product dependence of this Pauli repulsion is investigated. Dynamical e↵ects are then included in the potential with the density-constrained time-dependent Hartree-Fock (DCTDHF) method. In particular, isovector contributions to this potential are used to investigate the role of transfer on fusion, resulting in a lowering of the inner part of the potential for systems with positive Q-value transfer channels.

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Examining the role of transfer coupling in sub-barrier fusion ofTi46,50+Sn124

Abstract: Background The presence of neutron transfer channels with positive Q-values can enhance sub-barrier fusion cross sections.

Cited by 24 publications

References 37 publications

Dependence of fusion on isospin dynamics

Dependence of fusion on isospin dynamics

Transport properties of isospin asymmetric nuclear matter using the time-dependent Hartree-Fock method

Effect of Pauli repulsion and transfer on fusion

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