/ Theory-Nucl nucl-th/9705002


Halo excitation of He-6 in inelastic and charge exchange reactions


Ershov, S.N. (Bergen U.) ; Rogde, T. (Bergen U.) ; Danilin, B.V. (Bergen U.) ; Vaagen, J.S. (Bergen U.) ; Thompson, I.J. (Surrey U.) ; Gareev, F.A. (Dubna, JINR)

Published in: Phys.Rev.
Year: 1997
Vol.: C56
Page No: 1483-1499
Pages: 35

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.

Web-Page: http://www.adsabs.harvard.edu/abs/1997PhRvC..56.1483E; http://link.aps.org/abstract/PRC/V56/P01483/

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