Two-proton radioactivity with 2p halo is reported theoretically in light mass
nuclei A = 18-34. We predict 19Mg, 22Si, 26S, 30Ar and
34Ca as promising candidates of ground state 2p-radioactivity with
S2p​ 0. Observation of extended tail of spatial
charge density distribution, larger charge radius and study of proton single
particle states, Fermi energy and the wave functions indicate 2p halo like
structure which supports direct 2p emission. The Coulomb and centrifugal
barriers in experimentally identified 2p unbound 22Si show a quasi-bound
state that ensures enough life time for such experimental probes. Our
predictions are in good accord with experimental and other theoretical data
available so far.Comment: 5 Pages, 5 figure