Approximations in fusion and breakup reactions induced by radioactive beams

Cárdenas, W. H. Z.; Canto, L. F.; Donangelo, R.; Hussein, M. S.; Lubián, J.; Romanelli, A.

doi:10.1016/s0375-9474(01)01672-4

Cited by 11 publications

(16 citation statements)

References 23 publications

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“…Since the beginning of the 1990's, theorists have been facing conflicting ideas about whether the fusion of such nuclei, of great importance in nuclear astrophysics, is enhanced or hindered at low energies owing to the strong coupling to the break-up channel [10,11,12,13,14,15,16,17,18,19,20,21,22]. The reason for such divergent conclusions has been the lack of a trust-worthy continuum-coupled channels theory.…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, there is no such a complete theoretical study in this field. Different approaches have been used, such as coupled channel calculations (CCC) that do not take into account the break-up process [19], continuum discrete coupled channel calculations (CDCC) [20,21,22], semi-classical trajectories, survival probability concept and dynamic polarization potentials [10,11,12,13,14,15,16,17,18].…”

Section: Introductionmentioning

confidence: 99%

“…The fusion of weakly bound nuclei, both stable and radioactive, has been the subject of intense theoretical and experimental activities [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48]. Since the beginning of the 1990's, theorists have been facing conflicting ideas about whether the fusion of such nuclei, of great importance in nuclear astrophysics, is enhanced or hindered at low energies owing to the strong coupling to the break-up channel [...…”

Section: Introductionmentioning

confidence: 99%

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Effect of the breakup on the fusion and elastic scattering of weakly bound projectiles onZn64

et al. 2005

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We study the behavior of the fusion, break-up, reaction and elastic scattering of different projectiles on 64 Zn, at near and above barrier energies. We present fusion and elastic scattering data with the tightly bound 16 O and the stable weakly bound 6 Li, 7 Li and 9 Be projectiles. The data were analyzed by coupled channel calculations. The total fusion cross sections for these systems are not affected by the break-up process at energies above the barrier. The elastic (non-capture) break-up cross section is important at energies close and above the Coulomb barrier and increases the reaction cross sections. In addition we also show that the break-up process at near and sub-barrier energies is responsible for the vanishing of the usual threshold anomaly of the optical potential and give rise to a new type of anomaly.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the breakup on the fusion and elastic scattering of weakly bound projectiles onZn64

et al. 2005

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“…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.…”

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confidence: 99%

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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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