"safe" coulomb excitation of Mg30

O. Niedermaier, H. Scheit, V. Bildstein, H. Boie, J. Fitting, R. Von Hahn, F. Köck, M. Lauer, U.K. Pal, H. Podlech, R. Repnow, D. Schwalm, C. Alvarez, F. Ames, G. Bollen, S. Emhofer, D. Habs, O. Kester, R. Lutter, K. RudolphM. Pasini, P.G. Thirolf, B.H. Wolf, J. Eberth, G. Gersch, H. Hess, P. Reiter, O. Thelen, N. Warr, D. Weisshaar, F. Aksouh, P. Van Den Bergh, P. Van Duppen, M. Huyse, O. Ivanov, P. Mayet, J. Van De Walle, J. Aystö, P.A. Butler, J. Cederkäll, P. Delahaye, H.O.U. Fynbo, L.M. Fraile, O. Forstner, S. Franchoo, U. Köster, T. Nilsson, M. Oinonen, T. Sieber, F. Wenander, M. Pantea, A. Richter, G. Schrieder, H. Simon, T. Behrens, R. Gernhäuser, T. Kröll, R. Krücken, M. Münch, T. Davinson, J. Gerl, G. Huber, A. Hurst, J. Iwanicki, B. Jonson, P. Lieb, L. Liljeby, A. Schempp, A. Scherillo, P. Schmidt, G. Walter

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Abstract / Description of output

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 2.25MeV/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."
Original languageEnglish
JournalPhysical Review Letters
Issue number17
Publication statusPublished - 6 May 2005


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