Journal
PHYSICAL REVIEW C
Volume 100, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.100.054607
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Funding
- Fund for Research Training in Industry and Agriculture (FRIA), Belgium
- European Union's Horizon 2020 research and innovation program [654002]
- Deutsche Forschungsgemeinschaft within the Collaborative Research Center 1245
- Deutsche Forschungsgemeinschaft within the Collaborative Research Center 1044
- PRISMA+ (Precision Physics, Fundamental Interactions and Structure of Matter) Cluster of Excellence
- State of Rhineland-Palatinate
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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 Be-11, the archetypical one-neutron halo nucleus, impinging on C-12 at 68 MeV/nucleon, which are usual experimental conditions for such measurements. The low-energy constants of the description of Be-11 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.
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