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SEMINAIRE DE L'IPN
Insights into the reactions and structure of light nuclei from Effective Field Theory
In this talk I will show how an Effective Field Theory for weakly-bound few-body 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 3He(α, γ) [1]. In this case we take 3He and 4He as the effective degrees of freedom and work to next-to-leading order in the EFT. We use a Bayesian analysis to perform the extrapolation of higher-energy data to solar energies and find a markedly smaller uncertainty to previous evaluations, as well as significant constraints on 3He-4He scattering parameters. Second, I will demonstrate that a three-body (α-neutron-proton) model of 6Li exhibits a correlation between the deuteron-α scattering length and the 6Li binding energy [2]. Such correlations appear generically in three-body 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-α 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 6He and 6Li.

[1] S-factor and scattering parameter from 3He + 4He !7Be + g data, X. Zhang, K. M. Nollett, and D. R. Phillips, arXiv:1811.07611, to appear in the proceedings of the 22nd International Conference on Few-body Problems in Physics.



[2] Few-body universality in the deuteron-a system, J. Lei, L. Hlophe, Ch. Elster, A. Nogga, F. M. Nunes, and D. R. Phillips, Phys. Rev. C 98, 051001 (2018)
Daniel R. Phillips
Ohio University - TU Darmstadt
29/05/2019 à 11:30
IPN Orsay, salle A015, bâtiment 100

Notes de dernières minutes :

PDF - 241 ko


 

IPN

Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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