Finite-size effects in heavy halo nuclei from effective field theory
Journal article, 2020

Halo/Cluster Effective Field Theory describes halo/cluster nuclei in an expansion in the small ratio of the size of the core(s) to the size of the system. Even in the point-particle limit, neutron-halo nuclei have a finite charge radius, because their center of mass does not coincide with their center of charge. This point-particle contribution decreases as 1 / Ac, where Ac is the mass number of the core, and diminishes in importance compared to other effects, e.g., the size of the core to which the neutrons are bound. Here we propose that for heavy cores the EFT expansion should account for the small factors of 1 / Ac. As a specific example, we discuss the implications of this organizational scheme for the inclusion of finite-size effects in expressions for the charge radii of halo nuclei. We show in particular that a short-range operator could be the dominant effect in the charge radius of one-neutron halos bound by a P-wave interaction. The point-particle contribution remains the leading piece of the charge radius for one-proton halos, and so Halo EFT has more predictive power in that case.

Author

EMIL RYBERG

Chalmers, Physics, Subatomic and Plasma Physics

Christian Forssen

Chalmers, Physics, Subatomic, High Energy and Plasma Physics

D. R. Phillips

Ohio University

Technische Universität Darmstadt

Helmholtz

U. van Kolck

University of Paris-Sud

University of Arizona

European Physical Journal A

1434-6001 (ISSN) 1434-601X (eISSN)

Vol. 56 1 7

Ab initio approach to nuclear structure and reactions (++) (ANSR)

European Commission (EC), 2009-12-01 -- 2014-11-30.

Subject Categories

Accelerator Physics and Instrumentation

Subatomic Physics

Theoretical Chemistry

DOI

10.1140/epja/s10050-019-00001-1

More information

Latest update

9/15/2020