We report on the first radioactive beam experiment performed at the recently commissioned REX-ISOLDE facility at CERN in conjunction with the highly efficient gamma spectrometer MINIBALL. Using 30Mg ions accelerated to an energy of 2.25 MeV/u together with a thin nat-Ni 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 de-excitation gamma ray yields the B(E2; 0+ -> 2+) value of 30Mg was determined to be 241(31) e2fm4. 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 30Mg lies still outside the ``island of inversion''.
@article{arxiv.nucl-ex/0412037,
title = {"Safe" Coulomb Excitation of 30Mg},
author = {O. Niedermaier and H. Scheit and V. Bildstein and H. Boie and J. Fitting and R. von Hahn and F. K"ock and M. Lauer and U. K. Pal and H. Podlech and R. Repnow and D. Schwalm},
journal= {arXiv preprint arXiv:nucl-ex/0412037},
year = {2007}
}