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Halo Excitation of $^6$He in Inelastic and Charge-Exchange Reactions

S. N. Ershov·T. Rogde·B. V. Danilin·J. S. Vaagen·I. J. Thompson·F. A. Gareev
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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 $^6$He(p,p')$^6$He$^*$ and charge-exchange $^6$Li(n,p)$^6$He$^*$ 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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S. N. Ershov, T. Rogde, B. V. Danilin, J. S. Vaagen, I. J. Thompson, F. A. Gareev. 1997-05-01. Halo Excitation of $^6$He in Inelastic and Charge-Exchange Reactions. https://doi.org/10.1103/physrevc.56.1483

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