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

Abstract

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.

Elastic scattering and total reaction cross section ofHe6+Sn120

“…A similar behavior, known as the breakup threshold anomaly, has been reported previously [14,15] in weakly bound systems.…”

Experimental study of the collision11Be +64Zn around the Coulomb barrier

“…As previously mentioned, data with the stable, weakly bound 9 Be isotope were also gathered. The experiment with the 9 Be beam was performed at the Laboratori Nazionali del Sud (LNS) in Catania.…”

“…The experiment with the 9 Be beam was performed at the Laboratori Nazionali del Sud (LNS) in Catania. A 9 Be beam at E lab = 29 MeV was delivered by the 14-MV SMP Tandem of the LNS. The beam was impinging on a 550 μg/cm 2 self-supporting 64 Zn target that was angled at 45…”

“…This was not the case for other halo nuclei. Recently we published a letter [6] where the quasielastic and breakup angular distributions for 11 Be on 64 Zn were reported along with the elastic scattering angular distributions of two other Be isotopes: 9 Be and 10 Be. In the present paper we describe the details of the experiment and of the theoretical analysis performed that could not be reported in Ref.…”

“…105, 022701 (2010). ], the elastic scattering angular distribution of the collisions 9,10 Be+ 64 Zn as well as the angular distribution for the quasielastic scattering and transfer/breakup cross sections for the 11 Be+ 64 Zn reaction were briefly reported. The suppression of the quasielastic angular distribution in the Coulomb-nuclear interference angular region observed in the collision of the 11 Be halo nucleus with respect to the other two beryllium isotopes was interpreted as being caused by a long-range absorption owing to the long decay length of the 11 Be wave function.…”