22C: S-Wave Two-Neutron Halo
Abstract
A dripline nucleus 22C is studied in a Borromean three-body model of 20C+n+n. The valence neutrons, interacting via a realistic potential, are constrained to be orthogonal to the occupied orbits in 20C. We obtain ample results supporting that 22C is an ideal S-wave two-neutron halo nucleus: The ground state is bound by 390-570 keV, the root mean square neutron and proton radii are 4.0 and 2.4 fm, and the two neutrons are predominantly in (s1/2)2 orbits. The binding mechanism of 22C is discussed. One- and two-body density distributions elucidate the halo character as well as the correlated motion of the neutrons. The reaction cross sections of 22C+12C collisions are predicted.
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