Statut  Confirmé 
Série  IPNTHEO 
Domaines  nuclth 
Date  Mercredi 29 Mai 2019 
Heure  11:30 
Institut  IPN 
Salle  Bâtiment 100, Salle A015 
Nom de l'orateur  Phillips 
Prenom de l'orateur  D. R. 
Addresse email de l'orateur  
Institution de l'orateur  Ohio University \newline Technische Universität Darmstadt 
Titre  Insights into the reactions and structure of light nuclei from Effective Field Theory. 
Résumé  In this talk I will show how an Effective Field Theory for weaklybound fewbody systems ("Halo EFT") aids the modeling and understanding of light nuclei in the $p$shell. After introducing Halo EFT I will discuss two examples of its use. First, I will describe our recent analysis of the reaction $^3$He($\alpha$, $\gamma$)~[1]. In this case we take $^3$He and $^4$He as the effective degrees of freedom and work to nexttoleading order in the EFT. We use a Bayesian analysis to perform the extrapolation of higherenergy data to solar energies and find a markedly smaller uncertainty to previous evaluations, as well as significant constraints on $^3$He$^4$He scattering parameters. Second, I will demonstrate that a threebody ($\alpha$neutronproton) model of $^6$Li exhibits a correlation between the deuteron$\alpha$ scattering length and the $^6$Li binding energy~[2]. Such correlations appear generically in threebody systems with weak binding (cf. the Phillips line in the $A=3$ system) and can be understood as a consequence of the requirement that the EFT be renormalized. The emergence of such a correlation in the presence of $p$wave nucleon$\alpha$ interactions is particularly striking, as is the fact that it is rather insensitive to the actual values of the $p$wave phase shifts. I will close by discussing the implications of this finding for model and EFT treatments of $^6$He and $^6$Li. 
Numéro de preprint arXiv  
Commentaires  $ $ 
Fichiers attachés 
Pour obtenir l' affiche de ce séminaire : [ Postscript  PDF ]

[ English version ] 