Abstract
We report on the first radioactive beam experiment performed at the recently commissioned REX-ISOLDE facility at CERN in conjunction with the highly efficient γ spectrometer MINIBALL. Using Mg30 ions accelerated to an energy of 2.25 MeV/u together with a thin Ninat target, Coulomb excitation of the first excited 2+ states of the projectile and target nuclei well below the Coulomb barrier was observed. From the measured relative deexcitation γ-ray yields the B(E2;0gs+→21+) value of Mg30 was determined to be 241(31)e2 fm4. Our result is lower than values obtained at projectile fragmentation facilities using the intermediate-energy Coulomb excitation method, and confirms the theoretical conjecture that the neutron-rich magnesium isotope Mg30 resides outside the “island of inversion.”Received 17 December 2004DOI:https://doi.org/10.1103/PhysRevLett.94.172501©2005 American Physical Society
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