Nuclear moments of neutron-rich aluminum isotopes

摘要: Ground-state magnetic-dipole moments (μ) of 30-32Al and electric quadrupole (Q) 31,32Al have been measured with the β-NMR method using spin-polarized radioactive-isotope beams produced in projectile-fragmentation reactions. Beams of 30-32Al were obtained by RIKEN projectile-fragment separator RIPS after fragmentation 40Ar projectiles at an energy E = 95A MeV on a 93Nb target. The obtained μexp[30-32Al] and $Q_{\rm exp}[^{32}{\rm Al]}$ values agree well with shell-model calculations within sd shell USD interaction. Also, Qexp[31Al] was found to be small. Thus, we can conclude that these aluminum isotopes are located outside island inversion.