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Sensitivity of one-neutron knockout to the nuclear structure of halo nuclei

par Hebborn, Chloë ;Capel, Pierre
Référence Physical Review C, 100, 5, 054607
Publication Publié, 2019-11-01

Article révisé par les pairs

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Résumé :

Background: Information about the structure of halo nuclei are often inferred from one-neutron knockout reactions. Typically the parallel-momentum distribution of the remaining core is measured after a high-energy collision of the exotic projectile with a light target. Purpose:We study how the structure of halo nuclei affects knockout observables considering an eikonal model of reaction. Method: To evaluate the sensitivity of both the diffractive and stripping parallel-momentum distributions to the structure of halo nuclei, we consider several descriptions of the projectile within a halo effective-field theory. We consider the case of Be11, the archetypical one-neutron halo nucleus, impinging on C12 at 68 MeV/nucleon, which are usual experimental conditions for such measurements. The low-energy constants of the description of Be11 are fit to experimental data as well as to predictions of an ab initio nuclear-structure model. Results: The one-neutron knockout reaction is confirmed to be purely peripheral, the parallel-momentum distribution of the remaining core is sensitive only to the asymptotics of the ground-state wave function and not to its norm. The presence of an excited state in the projectile spectrum reduces the amplitude of the breakup cross section; the corresponding probability flux is transferred to the inelastic-scattering channel. Although the presence of a resonance in the core-neutron continuum significantly affects the energy distribution, it has no impact on the parallel-momentum distribution. Conclusions: The one-neutron knockout cross section can be used to infer information about the tail of the ground-state wave function, viz. its asymptotic normalization coefficient (ANC). The independence of the parallel-momentum distribution on the continuum description makes the extraction of the ANC from this observable very reliable.