Halo Excitation of 6He in Inelastic and Charge-Exchange Reactions
S. N. Ershov, T. Rogde, B. V. Danilin, J. S. Vaagen, I. J. Thompson, F. A. Gareev
Abstract
Four-body distorted wave theory appropriate for nucleon-nucleus reactions leading to 3-body continuum excitations of two-neutron Borromean halo nuclei is developed. The peculiarities of the halo bound state and 3-body continuum are fully taken into account by using the method of hyperspherical harmonics. The procedure is applied for A=6 test-bench nuclei; thus we report detailed studies of inclusive cross sections for inelastic 6He(p,p')6He* and charge-exchange 6Li(n,p)6He* reactions at nucleon energy 50 MeV. The theoretical low-energy spectra exhibit two resonance-like structures. The first (narrow) is the excitation of the well-known 2+ three-body resonance. The second (broad) bump is a composition of overlapping soft modes of multipolarities 1-, 2+, 1+, 0+ whose relative weights depend on transferred momentum and reaction type. Inelastic scattering is the most selective tool for studying the soft dipole excitation mode.
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