Elastic scattering and total reaction cross section for the 6He + 27Al system

Abstract

The elastic scattering of the radioactive halo nucleus 6He on 27Al target was measured at four energies close to the Coulomb barrier using the RIBRAS (Radioactive Ion Beams in Brazil) facility. The São Paulo Potential (SPP) was used and its diffuseness and imaginary strength were adjusted to fit the elastic scattering angular distributions. Reaction cross-sections were extracted from the optical model fits. The reduced reaction cross-sections of 6He on 27Al are similar to those for stable, weakly bound projectiles as 6,7Li, 9Be and larger than stable, tightly bound projectile as 16O on 27Al

B8+Al27 scattering at low energies

“…Such nuclei are unstable by beta emission or electron capture, with relatively long lifetimes (milliseconds up to seconds), sufficient to produce a secondary beam. Light exotic nuclei usually present a pronounced cluster structure, with very low separation energies in comparison to their stable partners and can be found either in the neutron rich [9][10][11][12][13][14][15][16][17][18] or in the proton rich sides [19][20][21][22][23][24] of the nuclear chart. One of these nuclei is 8 B which is formed by a 7 Be core plus one proton bound by only 0.137 MeV to the core.…”

Elastic scattering and total reaction cross sections with low-energy light radioactive ion beams.

“…For low-energy beams, one-nucleon or few nucleons transfer reactions are the best options to produce radioactive nuclear due to its high cross sections. For instance, the one-nucleon transfer reaction 9 Be( 7 Li, 6 He) is used in T winS ol and RIBRAS to produce reasonably intense 6 He beam (10 6 pps) for 1µA of primary beam. In Table-1 we list the beams produced so far by these two facilities and its respective production reactions and intensity.…”

“…Among these mechanisms, direct or sequential breakup can become important, even at relatively low incident energies, and in this case, Continuum Discretized Coupled Channel (CDCC) calculations would be required. The importance of these couplings has been discussed in the investigation of elastic scattering of the neutron-rich nucleus 6 He on different targets such as 209 Bi [5], 120 Sn [7], 64 Zn [8] and in light targets such as 27 Al [6]. More recently, elastic scattering measurements of 8 B and 7 Be on 58 Ni have been reported [9].…”

“…In particular, two facilities, RIBRAS at São Paulo, Brazil [1,2], and T winsol at Notre Dame, USA [3] have produced light nuclei radioactive beams such as 6 He, 7 Be, 8 Li, 8 B and others. These beams are being used to investigate low-energy reactions such as elastic scattering, transfer, breakup and fusion reactions, which can provide useful information on the structure of light nuclei near the dripline.…”

Measurements of angular distributions for7Li elastically scattered from58Ni at energies around the Coulomb barrier

“…A clear and specific example of the relevance of elastic scattering experiments is the discovery of the atomic nucleus in 1911, made by Ernest Rutherford. Lately, many experiments and theoretical analyse have been performed using radioactive beams as projectiles to produce a nuclear reaction [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]. It is well known that in general experiments with halo nuclei are difficult to carry out, mainly because of the low intensities of the respective beams.…”