Fusion barriers, empirical and theoretical: Evidence for dynamic deformation in subbarrier fusion

Vaz, Louis C.; Alexander, J.; Satchler, G.R.

doi:10.1016/0370-1573(81)90094-6

Cited by 328 publications

(112 citation statements)

References 81 publications

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“…If the direct break-up process had an important influence on the fusion cross section, the derived barrier parameters should have anomalous values. Reasonable fits were obtained for all the systems, and the barrier parameters agree with the values from the systematic study [24], within the usual fluctuations around the average values. The fusion excitation functions for these systems are very similar, regardless the presence or absence of weakly bound nuclei, as it is shown in Figs.…”

supporting

confidence: 79%

Influence of the break-up on the fusion and scattering processes

Lubián¹,

Gomes²,

Anjos³

et al. 2003

Braz. J. Phys.

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We present results of the study of the influence of the break-up process on the fusion, scattering and reaction cross sections, at near barrier energies. Most of the discussed reactions and scattering mechanisms are induced by the stable weakly bound nuclei 6,7 Li and 9 Be, although comparisons with reactions induced by strongly bound nuclei are also made. We give a picture of the break-up and fusion mechanisms at energies above the Coulomb barrier.The effects of the coupling of elastic, inelastic and transfer channels on the fusion cross section, at energies close to and bellow the Coulomb barrier, have been extensively investigated in the last two decades. At present they are reasonably understood, and their most remarkable effect is the enhancement of the fusion cross section at the subbarrier energy regime, relative to the predictions of onedimensional barrier penetration models. However, in the last years the effect of the break-up process on the fusion cross section started to be investigated, and in the present situation it is still very far from being fully understood. At present there are few and controversial experimental data. From the theoretical side, there are models that predict the fusion cross section enhancement, when compared with the fusion induced by strongly bound nuclei, due to the additional break-up channel. This enhancement should be particularly important at sub-barrier energies, where the coupling effects on the fusion may be strong. On the other hand, some models suggest the hindrance of the complete fusion, due to the loss of incident flux in this channel, caused by the break-up. There are also predictions of fusion cross section enhancement at sub-barrier energies and fusion hindrance above barrier energies, both effects originated from the break-up process.There is a special interest on this subject due to the recently available radioactive beams of very weakly bound nuclei. Reactions with these nuclei are important in processes of astrophysical interest, as well as in the search of mechanisms that produce super heavy elements. The full understanding of reactions induced by the highly intense beams of stable weakly bound nuclei is a key for the study of the reactions induced by the low intensity radioactive beams. The UFF 's group of Heavy Ion Reactions and their collaborators have been investigating this subject during the last years [1][2][3][4][5][6][7][8][9][10][11][12].The most suitable stable nuclei for this type of investigation are 9 Be, 6 Li and 7 Li, due to their small separation energies that should favor the break-up process. It is important to study the role of the break-up of these projectiles on different target masses, in order to investigate the effect, on the fusion, of nuclear and Coulomb break-ups. Also, it is important to span the energy region from sub-barrier to twice or three times the barrier, because there are evidences that the role of the break-up on the fusion depends on the energy regime.A major difficulty with many of the fusion experiments is the fa...

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supporting

confidence: 79%

Influence of the break-up on the fusion and scattering processes

Lubián¹,

Gomes²,

Anjos³

et al. 2003

Braz. J. Phys.

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“…Above the l-wave barrier the transmission coefficient is approximated by the Hill-Wheeler formula [26]. Below the barrier the WKB method has been used :…”

Section: Fusion Cross Sectionsmentioning

confidence: 99%

Rotating hyperdeformed states in light nuclear systems

Royer¹,

Gaudillot²

2011

Phys. Rev. C

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The existence of rotating quasi-molecular hyperdeformed states formed in the entrance channel of capture reactions of light nuclei is predicted within a rotational liquid drop model including the nuclear proximity energy. The l-dependent capture barrier heights and positions as well as the angular momentum, the energy and the moment of inertia ranges of these very deformed high spin states are given for the reactions 13 C+ 13

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“…Low incident energies drive the reacting partners into complete (or incomplete) fusion followed by the pre-equilibrium emission of the nucleons [1]. Further increase in the excitation energy breaks colliding nuclei into many pieces [2].…”

Section: Introductionmentioning

confidence: 99%

Towards the fusion of weakly bound projectiles with heavy targets with proximity based potentials

Kumari

2014

EPJ Web of Conferences

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Abstract. Theoretical calculations using proximity based potentials are performed to predict the fusion cross sections of the reactions of weakly bound projectiles especially halo nuclei with 209 Bi target. Both neutron halo as well as proton halo projectiles are taken in the present analysis. In particular, we study the role of extended nuclear radii of these weakly bound nuclei on the fusion cross sections. The inability of 8 B+ 58 Ni reaction to follow the systematics at above barrier energies motivates us to investigate the trend for the reactions of those weakly bound nuclei for which experiments are not yet performed. Our results indicate that extended radii of these weakly bound nuclei significantly affect fusion barrier heights as well as fusion probabilities throughout the energy range. We also study the fusion probabilities of a few reactions involving tightly bound projectiles.

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Fusion barriers, empirical and theoretical: Evidence for dynamic deformation in subbarrier fusion

Cited by 328 publications

References 81 publications

Influence of the break-up on the fusion and scattering processes

Influence of the break-up on the fusion and scattering processes

Rotating hyperdeformed states in light nuclear systems

Towards the fusion of weakly bound projectiles with heavy targets with proximity based potentials

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