Systematic investigation of “hindrance” in heavy-ion fusion reactions at deep sub-barrier energies

Cheng, Kaixuan; Chang, Xu

doi:10.1016/j.nuclphysa.2019.121642

Cited by 9 publications

(8 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The study of underlying physics involved in low energy heavy-ion fusion reactions is essential for a better understanding of the characteristics of nuclear forces, nuclear structure, superheavy nuclei (SHN), magic shell closure, drip lines, and other related phenomena [1][2][3][4][5][6][7][8][9][10]. The interaction potential and consequently the fusion barrier formed between the projectile and target nuclei provides the basis to understand the dynamics involved in these fusion reactions.…”

Section: Introductionmentioning

confidence: 99%

“…The Coulomb potential is a known quantity and has a well-established formula. For the calculation of nuclear potential, we have different theoretical approaches available in literature [2,[15][16][17][18][19][20][21][22][23][24][25][26]. These theoretical models differ from each other in respect of their basic assumptions and the parameters used.…”

Section: Introductionmentioning

confidence: 99%

“…These theoretical models differ from each other in respect of their basic assumptions and the parameters used. As a consequence, the fusion barrier characteristics calculated also vary and greatly depend upon the adjustments of parameters used in a theoretical formalism [2,[15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…The phenomenological proximity potentials based on the proximity theorem [16,17] are widely used to estimate the nuclear interaction potential in terms of the mean curvature of the interacting surfaces and a universal function of separation distance [2,[16][17][18][19]. The Bass potential based upon the liquid drop model also provides a simple exponential form for the nuclear interaction potential [2,[20][21][22]. Moreover, the semimicroscopic approaches describe nuclear interaction potential as the difference in the energies of interacting nuclei at an infinite separation and a distance when overlapping.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Systematic study of fusion barrier characteristics within the relativistic mean-field formalism

Rana,

Bhuyan,

Kumar

2022

Preprint

View full text Add to dashboard Cite

Background: Heavy-ion fusion reactions play a crucial role in various aspects of nuclear physics and astrophysics. The nuclear interaction potential and hence the fusion barrier formed between the interacting nuclei are the keys to understanding the complex fusion process dynamics. Thus, a theoretical investigation of fusion barrier characteristics which includes the relativistic effects is of paramount significance. Purpose: This work intends to explore the fusion barrier characteristics of different target-projectile combinations within the relativistic mean-field (RMF) formalism. The M3Y nucleon-nucleon (NN) potential is compared with the relativistic R3Y and density dependent R3Y (DDR3Y) NN potentials within the double folding approach. A systematic study is carried out to study the effect of different RMF density distributions and effective NN interactions on the fusion and/or capture cross-section of twenty-four (24 nos) target-projectile combinations leading to heavy and superheavy nuclei (SHN). Methods: The density distributions of interacting nuclei and the microscopic R3Y NN interaction are obtained from relativistic mean-field (RMF) formalism for non-linear NL1, NL3, TM1, and relativistic-Hartree-Bogoliubov (RHB) approach for DDME2 parameter sets. The medium independent relativistic R3Y, the density dependent DDR3Y, and widely adopted M3Y NN potential are used to obtain the nuclear interaction potential within the double folding approach. The densities for the projectiles and targets are obtained from the relativistic mean-field approaches. The fusion and/or capture cross-section for the different reaction systems is calculated using the well-known -summed Wong model. Results: The barrier height and position of 24 heavy-ion reaction systems are obtained for different nuclear density distributions and effective NN interaction potentials. We have considered the lighter mass projectile and heavier mass target combinations for synthesizing exotic drip-line nuclei, including the super-heavy nuclei (SHN). These reactions include the even-even 48 Ca+ 154 Sm, 48 Ca+ 238 U, 48 Ca+ 248 Cm, 26 Mg+ 248 Cm; even-odd 46 K+ 181 Ta; odd-odd 31 Al+ 197 Au and 39 K+ 181 Ta and also seventeen other systems for the synthesis of SHN Z=120. The comparison of fusion and/or capture cross-section obtained from the -summed Wong model is made with the available experimental data. Conclusions: The phenomenological M3Y NN potential is observed to give higher barrier heights than the relativistic R3Y NN potential for all the reaction systems. The comparison of results obtained from different relativistic parameter sets shows that the densities from NL1 and TM1 parameter sets give the lowest and highest barrier heights for all the systems under study. The density dependant DDR3Y NN potential is obtained within the Relativistic-Hartree-Bogoliubov approach for the DDME2 parameter set. We observed higher barrier heights and lower cross-sections for DDR3Y NN potential as compared to density-independent R3Y NN potentials obtained for con...

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Systematic study of fusion barrier characteristics within the relativistic mean-field formalism

Rana,

Bhuyan,

Kumar

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…According to the literature, the experimental values of the logarithmic derivative must increase slowly with a decrease in the center-of-mass energy of heavy-ion fusion reactions [7][8][9]16,17]. The onset of the sub-barrier fusion hindrance phenomenon can be identified by the intersection between the factor and the constant factor function, .…”

Section: Introductionmentioning

confidence: 99%

Survey of deep sub-barrier heavy-ion fusion hindrance phenomenon for positive and negative Q-value systems using the proximity-type potential

Gharaei¹,

Fuji²,

Azadegan³

2021

Chinese Phys. C

View full text Add to dashboard Cite

A systematic survey of the accurate measurements of heavy-ion fusion cross sections at extreme sub-barrier energies is performed using the coupled-channels (CC) theory that is based on the proximity formalism. This work theoretically explores the role of the surface energy coefficient and energy-dependent nucleus-nucleus proximity potential in the mechanism of the fusion hindrance of 14 typical colliding systems with negative -values, including 11B+197Au, 12C+198Pt, 16O+208Pb, 28Si+94Mo, 48Ca+96Zr, 28Si+64Ni, 58Ni+58Ni, 60Ni+89Y, 12C+204Pb, 36S+64Ni, 36S+90Zr, 40Ca+90Zr, 40Ca+40Ca, and 48Ca+48Ca, as well as five typical colliding systems with positive -values, including 12C+30Si, 24Mg+30Si, 28Si+30Si, 36S+48Ca, and 40Ca+48Ca. It is shown that the outcomes based on the proximity potential along with the above-mentioned physical effects achieve reasonable agreement with the experimentally observed data of the fusion cross sections , astrophysical factors, and logarithmic derivatives in the energy region far below the Coulomb barrier. A discussion is also presented on the performance of the present theoretical approach in reproducing the experimental fusion barrier distributions for different colliding systems.

show abstract

Variation of nuclear matter properties in fusion reaction of the 64Ni+64Ni

Ghasemi

Ghodsi

2020

Nuclear Physics A

View full text Add to dashboard Cite

Systematic investigation of “hindrance” in heavy-ion fusion reactions at deep sub-barrier energies

Cited by 9 publications

References 59 publications

Systematic study of fusion barrier characteristics within the relativistic mean-field formalism

Systematic study of fusion barrier characteristics within the relativistic mean-field formalism

Survey of deep sub-barrier heavy-ion fusion hindrance phenomenon for positive and negative Q-value systems using the proximity-type potential

Variation of nuclear matter properties in fusion reaction of the 64Ni+64Ni

Contact Info

Product

Resources

About