Statut  Confirmé 
Série  NUCTHEO 
Domaines  nuclth 
Date  Mardi 25 Juin 2024 
Heure  14:00 
Institut  IJCLAB 
Salle  A018 
Nom de l'orateur  Phillips 
Prenom de l'orateur  Daniel 
Addresse email de l'orateur  
Institution de l'orateur  Ohio University 
Titre  Universal or not? EFT insights into reactions on twoneutron halos and $^6$Li 
Résumé  Fewbody universality connects the properties of systems that are governed by interactions which generate large swave scattering lengths, $a_0$. In the first part of this talk I will argue that several twoneutron halo nuclei could display aspects of fewbody universality. In particular, I will show calculations of the twoneutron energy spectrum that is produced after rapid removal of the core from several exotic nuclei. After appropriate rescaling the resulting spectra are described by single curve, a result that is due to the proximity of the neutronneutron and coreneutron interactions to the unitary limit $a_0\to \infty$. In the second part of the talk I will discuss ab initio results for $^6$Li that were obtained using the NoCore Shell Model with Continuum (NCSMC). The NCSMC calculations show a strong correlation between the deuteron separation energy in $^6$Li and the Asymptotic Normalization Coefficient of the alphadeuteron component of its wave function. I will argue that this correlation is not a universal one, but that it is due to a factorization of longdistance and shortdistance physics in $^6$Li, and that this factorization can be exploited to make ab initio calculations of that system more efficient. 
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