Universal Properties of Weakly Bound Two-Neutron Halo Nuclei

Abstract

We construct an effective field theory of a two-neutron halo nucleus in the limit where the two-neutron separation energy $B$ and the neutron-neutron two-body virtual energy ${ϵ}_n$ are smaller than any other energy scale in the problem, but the scattering between the core and a single neutron is not fine-tuned, and the Efimov effect does not operate. The theory has one dimensionless coupling which formally runs to a Landau pole in the ultraviolet. We show that many properties of the system are universal in the double fine-tuning limit. The ratio of the mean-square matter radius and charge radius is found to be $⟨r_m^2⟩/⟨r_c^2⟩=Af({ϵ}_n/B)$, where $A$ is the mass number of the core and $f$ is a function of the ratio ${ϵ}_n/B$ which we find explicitly. In particular, when $B\gg {ϵ}_n$, $⟨r_m^2⟩/⟨r_c^2⟩=\frac{2}{3}A$. The shape of the the $E1$ dipole strength function also depends only on the ratio ${ϵ}_n/B$ and is derived in explicit analytic form. We estimate that for the ${}^{22}$C nucleus higher-order corrections to our theory are of order 20% or less if the two-neutron separation energy is less than 100 keV and the $s$-wave scattering length between a neutron and a ${}^{20}$C nucleus is less than 2.8 fm.

Comments: 5+6 pages, 6+5 figures; v2: typos fixed, published version