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Abstract
We extend our previous calculation of the breakup of 11Be using Halo Effective Field Theory and the Dynamical Eikonal Approximation to include an effective 10Be-n-target force. The force is constructed to account for the virtual excitation of 10Be to its low-lying 2+ excited state. In the case of breakup on a 12C target this improves the description of the neutron-energy and angular spectra, especially in the vicinity of the 11Be 52+ state. By fine-tuning the range parameters of the three-body force, a reasonable description of data in the region of the 32+11Be state can also be obtained. This sensitivity to the three-body force's range results from the structure of the overlap integral that governs the 11Be s-to-d-state transitions which it induces.
Highlights
Since their discovery in the mid-80s halo nuclei have been the subject of intense experimental and theoretical study [1, 2]
After a brief reminder of the theoretical framework, we introduce the form of the three-body force that we consider in this work, see Sec. 2
Because we focus on the excitation of 11Be resonant states during the breakup, we look at the angular distribution, in which the breakup cross section is computed as a function of the scattering angle θ of the 10Be-n centre of mass within the energy range of the 5+ 2 resonance, 1.2 MeV ≤ E ≤ 1.4 MeV, see Fig. 2(b)
Summary
Since their discovery in the mid-80s halo nuclei have been the subject of intense experimental and theoretical study [1, 2]. These nuclei, located on the edge of the valley of stability, are much larger than their isobars. Their unusual size can be seen as a manifestation of quantum-tunneling: one or two loosely bound valence nucleons have a high probability to reside in the classically forbidden region outside the nuclear mean-field potential. The nucleus can be described as an extended, diffuse halo surrounding a compact core. Archetypes are 11Be, a one-neutron halo, and 11Li, with two neutrons in its halo.
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