Fusion cross section measurements for systems 6Li + 27Al,64Zn at near-barrier energies

Rodríguez, Matías; Padron, I.; Martí, G. V.; Anjos, R. M.; Gomes, P. R. S.; Lubián, J.; Veiga, R.; Pacheco, A. J.; Capurro, O. A.; Niello, J. O. Fernández; Testoni, J. E.; Arazi, A.; Ramírez, M.

doi:10.1590/s0103-97332004000500043

Cited by 3 publications

(3 citation statements)

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“…Since the inelastic excitation of 64 Zn has small cross section [11], and transfer channels have negative Q-values, we use the unitary constraint σ R σ TF + σ EBU to derive that the cross sections of the 9 Be break-up into two alpha particles plus one neutron without any capture (EBU) are significative, when compared with σ TF , at energies close to the barrier. For the 6 Li [14][15][16], σ R are larger than σ TF even at the highest energies, and therefore σ EBU has significant cross section at this regime. The derived σ EBU values for both systems are also shown in figures 1(a) and (b), where the curves correspond to CCFULL [17] calculations without any couplings.…”

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confidence: 99%

Fusion, break-up and elastic scattering of weakly bound nuclei

Gomes

Padron

Niello

et al. 2005

J. Phys. G: Nucl. Part. Phys.

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We describe the behaviour of the fusion, break-up, reaction cross sections and elastic scattering of weakly bound nuclei, at near and above barrier energies. The total fusion cross sections are not affected by the break-up process at this energy regime. The elastic break-up cross sections are important at energies close and above the Coulomb barrier, even in systems with light targets, and increase the reaction cross sections. 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 gives rise to a new type of anomaly, named by us as break-up threshold anomaly.

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mentioning

confidence: 99%

Fusion, break-up and elastic scattering of weakly bound nuclei

Gomes

Padron

Niello

et al. 2005

J. Phys. G: Nucl. Part. Phys.

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“…The gamma-ray spectroscopy method, however, may allow to infer the separation between both processes in some particular systems. σ T F of 6,7 Li + 64 Zn, 27 Al and 9 Be + 27 Al were measured at the TANDAR by the time of flight method [22][23][24][25][26][27][28]. The fusion of 9 Be + 64 Zn was measured at USP by the in-beam and off-beam gamma ray spectroscopy methods [20,21], when the derived σ ICF for this system was much smaller than 10% of σ CF .…”

Section: Experimental Results and Present Understanding Of Fusion Andmentioning

confidence: 99%

“…This similarity is even more evident for light systems for which the main evaporation channels include charged particles. This is the reason why most of the available data in the literature correspond to TF cross sections, obtained by time of flight or gamma ray spectroscopy methods [20][21][22][23][24][25][26][27][28], although the main interest is in the behavior of the CF cross section.…”

Section: Experimental Difficulties and Methodsmentioning

confidence: 99%

Fusion, Breakup and Scattering of Weakly Bound Nuclei

Gomes¹,

Lubián²,

Paes³

et al. 2009

AIP Conference Proceedings

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Recibido el 3 de enero de 2006; aceptado el 30 de marzo de 2006 We discuss the influence of the break-up process of stable weakly bound nuclei on the fusion cross section and on the elastic scattering at near barrier energies. The complete fusion for heavy targets is found to be suppressed at energies above the barrier, whereas this effect is negligible for light targets. The total fusion cross sections are not affected by the break-up process. The non capture break-up is the dominant process at sub-barrier energies, with significant cross sections also at energies close and above the Coulomb barrier. We also show that the break-up process is responsible for the vanishing of the usual threshold anomaly of the optical potential and give rise to a new type of anomaly, named break-up threshold anomaly (BTA).

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