Excitation modes of $^{11}$Li at E$_x \sim$ 1.3 MeV from proton collisions

Details Excitation modes of $^{11}$Li at E$_x \sim$ 1.3 MeV from proton collisions Excitation modes of $^{11}$Li at E$_x \sim$ 1.3 MeV from proton collisions

2002-06-24

arxiv.org/abs/nucl-th/0206057v1

Phys.Rev. C66 (2002) 021002

Physics

Nuclear Physics

Nuclear Theory

4 pages, 3 figures, to be published Phys Rev C, Rapid Communication

Scientific paper

10.1103/PhysRevC.66.021002

The cross section for p-$^{11}$Li inelastic scattering at 68 MeV/u is evaluated using the Multiple Scattering expansion of the total Transition amplitude (MST) formalism, and compared with the breakup in the shakeoff approximation. Three different potential models for $^{11}$Li are used to calculate the $^{11}$Li(p,p$'$) continuum excitations, and all show peaks below 3 MeV of excitation energy, both in resonant and some non-resonant channels. In the most realistic model of $^{11}$Li, there is a strong dipole contribution associated with attractive but not a fully-fledged resonant phase shifts, and some evidence for a J$_{nn}^\pi = 0_2^+$ resonant contribution. These together form a pronounced peak at around 1--2 MeV excitation, in agreement with experiment, and this supports the use of the MST as an adequate formalism to study excited modes of two-neutron nuclear halos.

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