Year: 2026
Type: preprint
Abstract: The structure of $^{22}$C remains unsettled more than a decade after the 2010 reaction-cross-section measurement. The nucleus sits at $N=16$, where the spherical closure of $^{24}$O competes with the deformation of $^{20}$C. We develop a multi-reference density functional approach that restores particle number and angular momentum and mixes quadrupole shapes while retaining the continuum. The calculation gives a deformed two-neutron halo with matter radius of 3.29 fm, closer to the carbon-target extraction, and a long $s$-wave tail. The ground state $0_{1}^{+}$ is dominated by oblate configurations, with $B(E2)$ values comparable to those of $^{20}$C. The valence neutrons occupy mixed $sd$ orbits; the $N=16$ closure established in $^{24}$O is substantially weakened in $^{22}$C.
Source: arXiv (Cornell University)
Author: Sun, Xiang-Xiang
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7215073451