Role of Barrier Modification and Nuclear Structure Effects in Sub-Barrier Fusion Dynamics of Various Heavy Ion Fusion Reactions

Gautam, Manjeet Singh; Vinod, K.; Kumar, Hitender

doi:10.1007/s13538-017-0510-3

Cited by 12 publications

(4 citation statements)

References 75 publications

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“…As a result, the coupling tohexadecapole deformation and rotational states in thetarget isotopecan betested to address the fusion enhancement of 16 for the 154 Sm nucleusin the fusion process of 16 O+ 154 Sm systemresult in an acceptable explanation ofthe experimentaldata across the whole range of incident energies. The coupled channel investigations due to Leigh et al [67] and Gautam [77] yielded similar conclusions about the sub-barrierfusion enhancement of 16 O+ 144,148,154 Sm and 17 O+ 144 Sm reactions. The fusion excitation functionsfor the 16 O+ 144,148,154 Sm and 17 O+ 144 Sm systems haveestimated byusing the simple Wong formula and the SAGBD model (see figure 5).…”

Section: Fusion Ofmentioning

confidence: 56%

“…In case of 144,148 Sm-nuclei, the vibrational degrees of freedom of the targets were turned out to be dominant while for 152,154 Sm-nuclei, the rotational states of targets were found to be very important and played a crucial role in the fusion dynamics of these isotopes with different projectiles. In this sense, the fusion dynamics of 16 O with 144,148,154 Sm and 17 O with 144 Sm reactions are very interesting and exciting [67][68][69][70][71][72][73][74][75][76][77][78][79]. In literature, the fusion dynamics of 16 O+ 144 Sm reaction was found to be highly sensitive to the cumulative impacts of inelastic surface quantum states, whereas the fusion of 17 O+ 144 Sm reaction reflected the superiority of cumulative effects of inelastic surface excitations as well as the positive Q-value neutron transfer channel [65,79,80].…”

Section: Introductionmentioning

confidence: 99%

“…In literature, the fusion dynamics of 16 O+ 144 Sm reaction was found to be highly sensitive to the cumulative impacts of inelastic surface quantum states, whereas the fusion of 17 O+ 144 Sm reaction reflected the superiority of cumulative effects of inelastic surface excitations as well as the positive Q-value neutron transfer channel [65,79,80]. The authors of [78,79], clearly recognised the importance of low-lying quantum statesin the fusion dynamics of 16 O+ 144,148 Sm reactions, while the effects of static and higher order deformations for targets were pointed out in the fusion mechanismof 16 O+ 150,152,154 Sm reactions [1,[67][68][69][70][71][72][73][74][75][76][77][78][79][81][82][83][84]. The shape ofSm-isotopes changes from spherical to a statically deformed as the isotopic mass of target increases.…”

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: Fusion Ofmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

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.

Self Cite

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“…With the emergence of heavy-ion reactions, nuclear physics has taken on a new dimension [8][9][10]. To understand the inner structure and nuclear properties of the nucleus, many types of research have been, and continue to be, carried out in this field [11][12][13][14][15]. All this research leads to the development of nuclear models that aim to explain the structure of the nucleus.…”

Section: Introductionmentioning

confidence: 99%

Heavy-Ion Fusion Reaction Calculations: Establishing the Theoretical Frameworks for 111In Radionuclide over the Coupled Channel Model

et al. 2021

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In this work, the production of 111In radionuclide has been investigated theoretically via heavy-ion fusion reactions of two stable nuclei: 37Cl+ 74Ge, 26Mg+ 85Rb, 30Si+ 81Br, and 46Ca+ 65Cu reactions. Fusion cross-sections, barrier distributions, and potential energies on mutual orientations in the reactions planes of all reactions have been researched in detail around the barrier region via a coupled channel (CC) model using different codes. First of all, the most suitable codes and calculation parameter sets were determined through the 37Cl+ 74Ge reaction, whose experimental data were available. The compatibility of the calculations via NRV knowledge base, CCFULL, CCDEF codes, and Wong’s formula with experimental data was analyzed. Barrier distributions and cross-sections for heavy-ion fusion reactions have been investigated with miscellaneous codes and vibrational-rotational nuclei combinations for interacting nuclei. Afterward, calculations were made with the determined parameter values for new reaction suggestions (26Mg+ 85Rb, 30Si+ 81Br, and 46Ca+ 65Cu reactions) and the results were compared. This study aims to suggest the new reaction combinations for the production of 111In radionuclide, to explore the impacts of different calculation codes and nuclear parameter combinations on the heavy-ion fusion cross-sections and barrier distributions, to demonstrate that the results are reliable, and to emphasize the importance of developing these studies in the preparation of new experiments.

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