Understanding {sup 6}He induced reactions at energies around the Coulomb barrier

Journal Article · Wed Jun 03 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3157827· OSTI ID:21316788

Moro, A M; Arias, J M ^[1]; Acosta, L; Martel, I; Sanchez-Benitez, A M ^[2]; Borge, M J. G.; Escrig, D; Tengblad, O ^[3]; Gomez-Camacho, J ^[1]; Rodriguez-Gallardo, M ^[3]

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1. Departamento de Fisica Atomica, Molecular y Nuclear, Facultad de Fisica, Universidad de Sevilla, Apartado 1065, E-41080 Sevilla (Spain)
2. Departamento de Fisica Aplicada, Universidad de Huelva, E-21071 Huelva (Spain)
3. Instituto de Estructura de la Materia, CSIC, Serrano 113bis, E-28006 Madrid (Spain)

Recent developments aimed to understand the observed features arising in the scattering of the Borromean nucleus {sup 6}He on heavy targets are discussed and compared with recent data for {sup 6}He+{sup 208}Pb measured at the RIB facility at Louvain-la-Neuve at energies around the Coulomb barrier. The analysis of the elastic scattering data in terms of the optical model, reveals the presence of a long range absorption mechanism, that manifests in the form of a large value of the imaginary diffuseness parameter. The elastic data have been also compared with three--body CDCC calculations, based on a di-neutron model of {sup 6}He, and four--body CDCC calculations, based on a more realistic three-body model of this nucleus. Finally, the angular and energy distribution of {alpha} particles emitted at backward angles are discussed and compared with different theoretical approaches. We find that these {alpha} particles are produced mainly by a two-neutron transfer mechanism to very excited states in the residual nucleus.

• OSTI ID: 21316788
• Journal Information: AIP Conference Proceedings, Vol. 1139, Issue 1; Conference: 31. workshop on nuclear physics in Brazil, Sao Sebastiao, Sao Paulo (Brazil), 8-12 Sep 2008; Other Information: DOI: 10.1063/1.3157827; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
COULOMB FIELD
COUPLED CHANNEL THEORY
ELASTIC SCATTERING
EXCITED STATES
FOUR-BODY PROBLEM
HELIUM 6 REACTIONS
LEAD 208 TARGET
NEUTRONS
OPTICAL MODELS
THREE-BODY PROBLEM
TWO-NUCLEON TRANSFER REACTIONS