Gamow shell model description of $^{4}\mathrm{He}(d,d)$ elastic scattering reactions
Résumé
Structure of weakly bound/unbound light nuclei is often related to the low-energy decay channels involving composite particles like deuteron or α particle. These channels are essential to understand the appearance of light nuclei in the Big Bang nucleosynthesis or the helium fusion. We generalize the Gamow shell model (GSM) in coupled-channel (GSM-CC) representation to include reaction channels with the composite particles. In the core + valence particle formulation, this unified microscopic approach for structure and reactions involving weakly bound/unbound nuclei can be also applied to study low-energy properties of heavy nuclei. As the first application of this generalized GSM-CC approach, we describe the structure of Li6 and deuteron-α-particle elastic scattering using the same effective Furutani-Horiuchi-Tamagaki (FHT)-type nucleon-nucleon interaction. Asymptotically, the deuteron structure including its continuum is described using the N3LO chiral force. The bulk of the data, including low-energy spectrum of Li6, asymptotic normalization coefficients, and angular differential cross sections are satisfactorily described.