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12 research outputs found

Antiproton-deuteron hydrogenic states from a coupled-channel approach

Author: Dohet-Eraly Jérémy
Duerinck Pierre-Yves
Lazauskas Rimantas
Publication venue: HAL CCSD
Publication date: 01/01/2023
Field of study

International audienceA coupled-channel nucleon-antinucleon interaction model is developed as an alternative to traditional optical models and is adjusted to reproduce the same NN¯ low-energy dataset as the Kohno-Weise potential. The scattering lengths of the antiproton-deuteron system and the level shifts of its lowest hydrogenic states are computed by solving the Faddeev-Merkuriev equations in configuration space. The calculations are carried out with two different nucleon-nucleon interactions and the results compared with those obtained with an optical model to explore the model-dependence, which is found to be weak. The antiproton annihilation densities on deuteron are finally calculated and compared

HAL-IN2P3

Antiproton-deuteron hydrogenic states from a coupled-channel approach

Author: Dohet-Eraly Jérémy
Duerinck Pierre-Yves
Lazauskas Rimantas
Publication venue
Publication date: 17/11/2023
Field of study

info:eu-repo/semantics/publishe

DI-fusion

Effective field theory analysis of the Coulomb breakup of the one-neutron halo nucleus $^{19}$ C

International audienceWe analyse the Coulomb breakup of 19C measured at 67A MeV at RIKEN. We use the Coulomb-Corrected Eikonal (CCE) approximation to model the reaction and describe the one-neutron halo nucleus 19C within Halo Effective Field Theory (EFT). At leading order we obtain a fair reproduction of the measured cross section as a function of energy and angle. The description is insensitive to the choice of optical potential, as long as it accurately represents the size of 18C. It is also insensitive to the interior of the 19C wave function. Comparison between theory and experiment thus enables us to infer asymptotic properties of the ground state of 19C: these data put constraints on the one-neutron separation energy of this nucleus and, for a given binding energy, can be used to extract an asymptotic normalisation coefficient (ANC). These results are confirmed by CCE calculations employing next-to-leading order Halo EFT descriptions of 19C: at this order the results for the Coulomb breakup cross section are completely insensitive to the choice of the regulator. Accordingly, this reaction can be used to constrain the one-neutron separation energy and ANC of 19C

arXiv.org e-Print Archive

HAL-IN2P3