Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series NUC-THEO
Subjects nucl-th
Date Tuesday 25 June 2024
Time 14:00
Institute IJCLAB
Seminar Room A018
Speaker's Last Name Phillips
Speaker's First Name Daniel
Speaker's Email Address
Speaker's Institution Ohio University
Title Universal or not? EFT insights into reactions on two-neutron halos and $^6$Li
Abstract Few-body universality connects the properties of systems that are governed by interactions which generate large s-wave scattering lengths, $a_0$. In the first part of this talk I will argue that several two-neutron halo nuclei could display aspects of few-body universality. In particular, I will show calculations of the two-neutron 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 neutron-neutron and core-neutron 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 No-Core 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 alpha-deuteron 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 long-distance and short-distance physics in $^6$Li, and that this factorization can be exploited to make ab initio calculations of that system more efficient.
arXiv Preprint Number
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