Recent achievements and experiments at the Louvain-la-Neuve radioactive nuclear beam facility

Quasi-elastic scattering of 6 He at E lab =27 MeV from 197 Au has been measured in the angular range of 6• − 72• in the laboratory system employing LEDA and LAMP detection systems. These data, along previously analysed data of 6 He + 208 Pb at the same energy, are analysed using Optical Model calculations. The role of Coulomb dipole polarizability has been investigated. Large imaginary diffuseness parameters are required to fit the data. This result is an evidence for long range absorption mechanisms in 6 He induced reactions.

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“…The 6 He beam used in this experiment was produced via the 7 Li(p,2p) 6 He reaction using LiF powder target contained in a graphite holder [11].…”

Section: Experimental Set-upmentioning

confidence: 99%

Long range absorption in the scattering of 6He on 208Pb and 197Au at 27 MeV

et al. 2006

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Section: Introductionmentioning

confidence: 99%

“…The radioactive nucleus 6 He has a three-body α + n + n structure with an extended neutron distribution or halo. The scattering and reactions of 6 He are therefore of considerable interest since experiments may demonstrate a sensitivity to this underlying structure. In addition, its threshold against 6 He → α + n + n breakup is less than 1 MeV and this weakly bound nature can also significantly affect the dynamics of the collision.…”

Section: Introductionmentioning

confidence: 99%

Breakup and neutron-transfer effects on6He+206Pb elastic scattering below the Coulomb barrier

et al. 2013

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The elastic scattering and inclusive α-particle yield for the 6 He + 206 Pb system at an incident energy of 18 MeV, just below the nominal Coulomb barrier, have been measured. The α-particle yield at forward angles is also reported. The data are analyzed by means of continuum-discretized coupled-channels, distorted wave Born approximation, and coupled reaction channels calculations. Couplings to the one-neutron-and two-neutron-transfer reactions are found to be able to account for most of the absorption in the entrance channel.

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“…This peculiar structure affects the dynamics of the collision, making these processes very interesting, as demonstrated by recent experimental campaigns. The data from these experiments show a sizable sensitivity to this underlying exotic structure [27,28,29,30]. Reactions induced by 6 He on several targets, at energies around the Coulomb barrier, exhibit some common features, such as a remarkably large cross section for the production of α particles.…”

Section: Introductionmentioning

confidence: 99%

Long range effects on the optical model of 6He around the Coulomb barrier

Fernández‐García¹,

Rodríguez‐Gallardo²,

Álvarez³

et al. 2010

Nuclear Physics A

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We present an optical model (OM) analysis of the elastic scattering data of the reactions 6 He+ 27 Al and 6 He+ 208 Pb at incident energies around the Coulomb barrier. The bare part of the optical potential is constructed microscopically by means of a double folding procedure, using the São Paulo prescription without any renormalization. This bare interaction is supplemented with a Coulomb dipole polarization (CDP) potential, which takes into account the effect of the dipole Coulomb interaction. For this CDP potential, we use an analytical formula derived from the semiclassical theory of Coulomb excitation. The rest of the optical potential is parametrized in terms of Woods-Saxon shapes. In the 6 He+ 208 Pb case, the analysis confirms the presence of long range components, in agreement with previous works. Four-body Continuum-Discretized Coupled-Channels calculations have been performed in order to better understand the features of the optical potentials found in the OM analysis. This study searches to elucidate some aspects of the optical potential of weakly bound systems, such as the dispersion relation and the long range (attractive and absorptive) mechanisms.

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Recent achievements and experiments at the Louvain-la-Neuve radioactive nuclear beam facility

Cited by 26 publications

References 11 publications

Long range absorption in the scattering of 6He on 208Pb and 197Au at 27 MeV

Long range absorption in the scattering of 6He on 208Pb and 197Au at 27 MeV

Breakup and neutron-transfer effects on6He+206Pb elastic scattering below the Coulomb barrier

Long range effects on the optical model of 6He around the Coulomb barrier

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