Halo excitation of {sup 6}He in inelastic and charge-exchange reactions
- (RNBT) Collaboration
Four-body distorted wave theory appropriate for nucleon-nucleus reactions leading to three-body continuum excitations of two-neutron Borromean halo nuclei is developed. The peculiarities of the halo bound state and three-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 {sup 6}He(p,p{sup {prime}}){sup 6}He{sup *} and charge-exchange {sup 6}Li(n,p){sup 6}He{sup *} reactions at nucleon energy 50 MeV. The theoretical low-energy spectra exhibit two resonancelike structures. The first (narrow) is the excitation of the well-known 2{sup +} three-body resonance. The second (broad) bump is a composition of overlapping soft modes of multipolarities 1{sup {minus}},2{sup +},1{sup +},0{sup +} whose relative weights depend on transferred momentum and reaction type. Inelastic scattering is the most selective tool for studying the soft dipole excitation mode. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 560983
- Journal Information:
- Physical Review, C, Vol. 56, Issue 3; Other Information: PBD: Sep 1997
- Country of Publication:
- United States
- Language:
- English
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