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Low-lying states and structure of the exotic $^8$He via direct reactions on the proton

Abstract : The structure of the light exotic nucleus 8He was investigated using direct reactions of the 8He SPIRAL beam on a proton-rich target. The (p,p') scattering to the Click to view the MathML source state, the (p,d)7He and (p,t)6He transfer reactions, were measured at the energy Elab=15.7 A.MeV. The light charged particles (p,d,t) were detected in the MUST Si-strip telescope array. The excitation spectrum of 8He was extracted from the (p,p') reaction. Above the known Click to view the MathML source excited state at 3.6 MeV, a second resonance was found around 5.4 MeV. The cross sections were analyzed within the coupled-reaction channels framework, using microscopic potentials. It is inferred that the 8He ground state has a more complex neutron-skin structure than suggested by previous α+4n models assuming a pure (1p3/2)4 configuration.
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Submitted on : Tuesday, May 15, 2007 - 12:43:20 PM
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F. Skaza, V. Lapoux, N. Keeley, N. Alamanos, F. Auger, et al.. Low-lying states and structure of the exotic $^8$He via direct reactions on the proton. 2nd International Conference on Collective Motion in Nuclei under Extreme Conditions - COMEX 2, Jun 2006, Sankt Goar, Germany. pp.260-265, ⟨10.1016/j.nuclphysa.2007.01.093⟩. ⟨in2p3-00145704⟩



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