Analysis of fusion dynamics of colliding systems involving stable, loosely bound and halo nuclei

Gautam, Manjeet Singh

doi:10.1088/0031-8949/90/12/125301

Cited by 9 publications

(5 citation statements)

References 58 publications

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“…The values of range parameter used in the EDWSP model calculations are consistent with the commonly adopted values of the range parameter (r 0 = 0.90fm to r 0 = 1.35fm) used in literature within the context of the different theoretical methods for different fusing systems [1,2,[35][36][37][38][39][40][41][42]. In the present analysis, the values of the range parameter extracted for the 4 9 Be + 39 89 Y, Y reactions are also consistent with our previous analysis [23][24][25][26][27][28][29][30][43][44][45][46][47].…”

supporting

confidence: 92%

Role of Projectile Degrees of Freedom in Sub-Barrier Fusion Dynamics

Gautam

2016

Braz J Phys

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supporting

confidence: 92%

Role of Projectile Degrees of Freedom in Sub-Barrier Fusion Dynamics

Gautam

2016

Braz J Phys

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“…In other words, the extrafusion enhancement at sub-barrier energies forthe 17 O+ 144 Sm reactionover the 16 O+ 144 Sm reactionis a consequenceof the cumulative influence of inelastic surface excitationsand one neutronchannel with a positive Q-value. The coupled channel investigations due to Leigh et al [67], Morton et al [72], and Gautam [75], drawn the similar conclusions about the fusion enhancement of 16,17 O+ 144 Sm systems. Inthe fusion of 16 O+ 148 Sm system, the shape ofparticipantsis considered to be spherical, and couplings to low lying quantum states such as + 2 and -3 vibrational states play an important role in the enhancing of fusion cross-sectionsat lower barrier energies than the 1-DBPM predictions as evident from figure 5(c).…”

Section: Fusion Ofmentioning

confidence: 57%

“…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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“…It has been recognized that the fusion mechanism of tightly bound nuclei in the close vicinity of the Coulomb barrier is strongly influenced by the intrinsic structure degrees of freedom of the colliding pairs [1][2][3][4][5][6][7]. For stable nuclei, the coupling of the relative motion of the colliding nuclei to their nuclear structure degrees of freedom, like collective surface vibrational states (spherical nuclei), rotational states (deformed nuclei), nucleon (multi-nucleon) transfer channels etc., eliminates the discrepancies between experimental fusion data and the expectations of the one-dimensional barrier penetration model [8][9][10][11][12][13]. However, in the fusion of colliding systems involving weakly bound nuclei (or halo nuclei), the breakup channel sig-nificantly affects the fusion process in the close vicinity of the Coulomb barrier [14,15].…”

Section: Introductionmentioning

confidence: 99%

Role of projectile breakup effects and intrinsic degrees of freedom on fusion dynamics

Gautam

2016

Chinese Phys. C

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This article analyzes the fusion dynamics of loosely bound and stable projectiles with Zr-target isotopes within the context of the coupled channel approach and the energy-dependent Woods-Saxon potential model (EDWSP model). In the case of the 28 Si+ 90 Zr reaction, the coupling to the inelastic surface excitations results in an adequate description of the observed fusion dynamics while in case of the 28 Si + 94 Zr reaction, the coupling to collective surface vibrational states as well as the neutron (multi-neutron) transfer channel is necessary in the coupled channel calculations to reproduce the below-barrier fusion data. However, the EDWSP model calculation provides an accurate explanation of the fusion data of 28 Si + 90,94 Zr reactions in the domain of the Coulomb barrier. In the fusion of the 6 Li+ 90 Zr reaction, the inclusion of the nuclear structure degrees of freedom recovers the observed sub-barrier fusion enhancement but results in suppression of the above barrier fusion data by 34% with respect to the coupled channel calculations. Using EDWSP model calculations, this suppression factor is reduced by 14% and consequently, the above-barrier fusion data of 6 Li+ 90 Zr reaction is suppressed by 20% with reference to the EDWSP model calculations. Such fusion suppression at above-barrier energies can be correlated with the breakup of the projectile ( 6 Li) before reaching the fusion barrier, as a consequence of low binding energy.

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Analysis of fusion dynamics of colliding systems involving stable, loosely bound and halo nuclei

Abstract: This article analyzed the fusion dynamics of stable nuclei, loosely bound nuclei and halo nuclei within the view of coupled channel approach and the energy dependent Woods-Saxon potential model (EDWSP model). The different projectiles ( Li

Cited by 9 publications

References 58 publications

Role of Projectile Degrees of Freedom in Sub-Barrier Fusion Dynamics

Role of Projectile Degrees of Freedom in Sub-Barrier Fusion Dynamics

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

Role of projectile breakup effects and intrinsic degrees of freedom on fusion dynamics

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