Effect of Two-neutron Transfer with Positive<i>Q</i>-value on Sub-barrier Fusion

Lin, C. J.; Jia, H. M.; Zhang, H. Q.; Xu, X. X.; Yang, X.; Bao, Pengfei; Sun, L. J.; Liu, Z. H.

doi:10.1051/epjconf/20136302007

Cited by 6 publications

(4 citation statements)

References 38 publications

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“…In order to understand the mechanism of neutron rearrangement effect in heavy-ion fusion reactions we need to simultaneously compare the sub-barrier fusion cross sections of two close projectile-target combinations with positive and negative Q-values for neutron transfer reaction channels, see figure 1 of [24] for ( 40 Ca + 90 Zr, 40 Ca + 96 Zr) and ( 16 O + 60 Ni, 18 O + 58 Ni) reactions as two example cases. Under these conditions, one can observe an additional enhancement in the excitation function at energies below the Coulomb barrier [25][26][27][28][29]. It must be noted that the first attempts for taking account of neutron transfer channel between the colliding nuclei within the framework of the CC technique is made by the method proposed in [23].…”

Section: Introductionmentioning

confidence: 99%

Exploring the fusion hindrance phenomenon: the case of ^32,34S + ⁸⁹Y

Gharaei¹,

Fuji²,

Azadegan³

et al. 2021

Phys. Scr.

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The sub-barrier fusion data of 32,34S + 89Y colliding systems are analyzed using the coupled-channels (CC) calculations, including couplings to the low-lying 2+ and 3− states in reacting nuclei as well as mutual and multi-phonon excitations of these states, based on the proximity potential model. In this scheme, we focus upon the the effect of surface energy coefficient γ and also thermal properties of liquids and hot nuclei on the inner part of the nuclear potential and thus on the fusion cross sections at bombarding energies far below the Coulomb barrier. As expected, our primary calculations using the original proximity potential 1977 show that this model underestimates the measured fusion cross sections at the whole energy region. It is shown that the mentioned physical effects bring significant cross sections enhancements for both reactions. The indications of the fusion hindrance phenomenon in the fusion cross sections at energies far below the Coulomb barrier show up. The observed S factors for the above-mentioned systems develop a maximum at low energies which can also be predicted by the phenomenological extrapolations. Our results within the framework of the modified form of the proximity potential reveal that the calculated fusion cross sections, S factors, and logarithmic slopes for the two systems are in good agreement with the corresponding experimental data even at the lowest energies.

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Section: Introductionmentioning

confidence: 99%

Exploring the fusion hindrance phenomenon: the case of ^32,34S + ⁸⁹Y

Gharaei¹,

Fuji²,

Azadegan³

et al. 2021

Phys. Scr.

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“…77 model significantly underestimates the measurements of the fusion-evaporation excitation functions at sub-barrier energies for a number of systems. However, it appears that this potential model achieves better performance for the lighter colliding systems 12 C+ 30 Si, 28 Si+ 30 Si, and 24 Mg+ 30 Si. These results can be understood by observing the radial behavior of the Coulomb plus nuclear potentials used in the CC calculations (see the inset in the figure).…”

Section: A the Fusion Cross Sectionmentioning

confidence: 99%

“…The existence of heavy-ion reactions with positive and negative fusion -values allows us to investigate the effect of the sign of the -value on the energy-dependent behavior of the coefficient. According to the literature [28][29][30][31][32][33][34], an additional enhancement in the sub-barrier fusion process can be observed due to the coupling of the neutron transfer channels with the positive -values. Nevertheless, the effective -values for various neutron transfer channels, involving single-and multi-neutron (up to six neutrons) stripping (or pick-up), are negative for most of the reactions investigated in this study.…”

Section: Introductionmentioning

confidence: 95%

“…[25] indicated that a shallow pocket is formed in the inner part of the potential barrier when the standard M3Y nuclear interaction accompanied by the Pauli blocking potential of two colliding nuclei is applied. Furthermore, it was shown that the fusion hindrance phenomenon in the colliding systems 12 C+ 198 Pt, 16 O+ 208 Pb, 12 C+ 30 Si, 24 Mg+ 30 Si, and 28 Si+ 30 Si can be described well by introducing the Pauli blocking potential.…”

Section: Introductionmentioning

confidence: 99%

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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

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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.

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