Relationship between and effect of inelastic excitations and transfer channels on sub-barrier fusion enhancement

Khushboo, .; Mandal, S.; Nath, S.; Madhavan, N.; Gehlot, J.; Jhingan, A.; Kumar, Neeraj; Banerjee, Tathagata; Kaur, Gurpreet; Devi, K. R. Sandhya; Banerjee, A.; Neelam, .; Varughese, T.; Siwal, Davinder; Garg, Rohini; Mukul, Ish; Saxena, M.; Verma, S.; Kumar, Suresh; Behera, B. R.; Verma, Priyanka

doi:10.1103/physrevc.96.014614

Cited by 24 publications

(30 citation statements)

References 43 publications

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“…The fusion excitation functions for the 12 C+ 92 Zr, 16 O+ 92 Zr, 28 Si+ 92 Zr, 35 Cl+ 92 Zr; 16 O+ 60 Ni, 18 O+ 58 Ni, 12 C+ 194,198 Pt; 16 O+ 144,148,154 Sm and 17 O+ 144 Sm systems at sub-barrier energies are very sensitive to involvements of the intrinsic degrees of freedom of the collision partners. To address these effects, the coupled channel calculations are performed by using the code CCFULL.…”

Section: Resultsmentioning

confidence: 99%

“…The cause of such anomaly is still unknown. Recently, Davydovska et al [45] applied same value of diffuseness parameter to the elastic scattering data as well as fusion data for 16 O+ 92 Zr, 16 O+ 116 Sn systems and fairly addressed the fusion crosssections in the whole range of incident energies. Thus, more intuitive investigations are needed in this direction so that one may understand the fusion mechanisms around the Coulomb barrier.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the current effort is an extension of previous studies that will aid in tracking the role of intrinsic degrees of freedom in the fusion process. According to the literature, the fusion of 12 C+ 92 Zr and 16 O+ 92 Zr reactions was dominated by the coupling to multi-phonon vibrational states of the target nucleus, whereas for the fusion of 28 Si+ 92 Zr and 35 Cl+ 92 Zr reactions, the strong influencesof neutron transfer channels were reported [51]. In literature [10,16,22,[52][53][54][55][56][57][58][59][60][61][62][63], it has been demonstrated that the positive Q-value neutron transfer channels favor the fusion enhancement in sub-barrier energy regions.…”

Section: Introductionmentioning

confidence: 99%

“…Using the one-dimensional Wong formula [50], the SAGBD model [46][47][48][49] and the coupled channel model [41], theoretical calculations of fusion excitation functions are done for the 12 C+ 92 Zr, 16 O+ 92 Zr, 28 12 C+ 194,198 Pt; 16 O+ 144,148,154 Sm and 17 O+ 144 Sm reactions in the sub-barrier domain. Also, the related barrier distributions data for above mentioned reactions are analyzed by using the SAGBD model.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive analysis of heavy-ion fusion reactions around the Coulomb barrier

Gautam¹,

Ghanghas²,

Chahal³

et al. 2022

Phys. Scr.

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We have investigated the fusion dynamics of 12C + 92Zr, 16O + 92Zr, 28Si + 92Zr, 35Cl + 92Zr, 16O + 60Ni, 18O + 58Ni, 12C + 194,198Pt, 16O + 144,148,154Sm and 17O + 144Sm reactions in the close vicinity of the Coulomb barrier. For this purpose, we have opted one-dimensional Wong formula, coupled channel approach, and symmetric-asymmetric Gaussian barrier distribution (SAGBD) model to analyze the fusion data for above mentioned reactions. For all studied systems, the theoretical results obtained from the one-dimensional Wong formula are unable to reproduce the fusion data especially at incident energies lying below the nominal barrier. This appeals for the inclusion of intrinsic degrees of freedom which have been originated from the nuclear structure of fusing nuclei, and thus essentially required to explain the experimental data at energies lying in the sub-barrier realm. For the chosen reactions, the coupled channel analysis suggests that the coupling of relative motion with the inelastic surface excitations and/or nucleon transfer channels associated with the reaction partners have produced a remarkable fusion enhancement at energies lying near and below the nominal barrier. It is particularly intriguing that the SAGBD model can replicate the impacts of dominant intrinsic reaction channels such as multi-phonon quantum states and/or nucleon transfer channels via Gaussian type of weight function. The predictions of the SAGBD approach appropriately reproduce the fusion cross-sections data and related barrier distributions data for the selected reactions due the fact that the multi-dimensional nature induces the barrier lowering effects and subsequently reduces the effective fusion barrier between the participants. In the SAGBD approach, the channel coupling effects are quantitively measured in terms of channel coupling parameter (λ) and percentage decrement in height of effective fusion barrier with respect to the Coulomb barrier (VCBRED ) . Furthermore, the recovered x 2-values for selected reactions are found to be smaller and hence clearly demonstrate the applicability of the model outcomes to explore the fusion dynamics of the studied systems.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comprehensive analysis of heavy-ion fusion reactions around the Coulomb barrier

Gautam¹,

Ghanghas²,

Chahal³

et al. 2022

Phys. Scr.

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“…Fusion excitation functions in linear scale of 28 Si + 100 Mo and of the other systems considered for comparison. The reported systems are 28 Si + 96 Zr [37], 32 S + 100 Mo [38], 32 S + 90,96 Zr [11], 28 Si + 90 Zr [36], besides 28 Si + 100 Mo.…”

Section: The Near-by Systems and The Ion-ion Potentialsmentioning

confidence: 99%

New insights into sub-barrier fusion of ²⁸Si + ¹⁰⁰Mo

Stefanini

Montagnoli

D’Andrea

et al. 2021

J. Phys. G: Nucl. Part. Phys.

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Fusion cross sections of the 28Si + 100Mo system have been measured near and below the Coulomb barrier by detecting the evaporation residues at forward angles. The excitation function has an overall smoother trend than what obtained in a previous experiment, and a large discrepancy is found for the lowest-energy region, where we observe a tendency of the S factor to develop a maximum, which would be a clear indication of hindrance. The results have been compared with the theoretical prediction of coupled-channels calculations using a Woods–Saxon nuclear potential, and including the low-energy excitation modes of both nuclei. Good agreement with data is found by including, in the coupling scheme, the three lowest members of the ground state rotational band of the oblate deformed 28Si, and two-phonons of the strong quadrupole vibration of 100Mo. The additional coupling, in a schematic way, of the two-neutron pick-up between ground states (Q-value = +4.86 MeV) has a minor effect on calculated cross sections, and does not essentially improve the data fit. The excitation function of 28Si + 100Mo has been compared with that of (1) the heavier system 60Ni + 100Mo having analogous features, and (2) several near-by 28Si, 32S + Zr, Mo systems with various nuclear structures and transfer Q-values. The role of quadrupole and octupole excitation modes, as well as of transfer channels, in affecting the fusion dynamics, are clarified to some extent. Systematic measurements of fusion barrier distributions and CC calculations properly including transfer couplings, are necessary, in order to shed full light on the influence of the various coupled channels on the fusion cross sections.

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