EXPLORING Mg ISOTOPE STRUCTURES THROUGH BETA-DELAYED DECAY OF SPIN-POLARIZED Na ISOTOPES
The present work aims at experimentally clarifying the structure change of neutron-rich Mg isotopes as a function of the neutron number by firmly establishing the level schemes of the Mg isotopes in a wide excitation energy range. We use our unique method of β-decay spectroscopy which takes advantage of anisotropic β decay of spin-polarized Na isotopes. The asymmetry parameters of the β decay are the effective tool to unambiguously assign the spin-parity of levels in the daughter nucleus. As the first step of the systematic studies on neutron-rich Mg isotopes from lighter region outside of the N = 20 “island of inversion” to heavier one across through the island, very detailed level scheme of 28Mg and 29Mg have been successfully established at TRIUMF, where the world-highest polarized alkali beams are available.
