Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2004-12-17
Phys.Rev.Lett. 94 (2005) 172501
Physics
Nuclear Physics
Nuclear Experiment
Scientific paper
10.1103/PhysRevLett.94.172501
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''.
Bildstein V.
Boie H.
Fitting J.
Hahn von R.
K"ock F.
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