"Safe" Coulomb excitation of 30Mg

• Published in: Physical review letters Vol. 94; no. 17; p. 172501
• Main Authors: Niedermaier, O, Scheit, H, Bildstein, V, Boie, H, Fitting, J, von Hahn, R, Köck, F, Lauer, M, Pal, U K, Podlech, H, Repnow, R, Schwalm, D, Alvarez, C, Ames, F, Bollen, G, Emhofer, S, Habs, D, Kester, O, Lutter, R, Rudolph, K, Pasini, M, Thirolf, P G, Wolf, B H, Eberth, J, Gersch, G, Hess, H, Reiter, P, Thelen, O, Warr, N, Weisshaar, D, Aksouh, F, Van den Bergh, P, Van Duppen, P, Huyse, M, Ivanov, O, Mayet, P, Van de Walle, J, Aystö, J, Butler, P A, Cederkäll, J, Delahaye, P, Fynbo, H O U, Fraile, L M, Forstner, O, Franchoo, S, Köster, U, Nilsson, T, Oinonen, M, Sieber, T, Wenander, F, Pantea, M, Richter, A, Schrieder, G, Simon, H, Behrens, T, Gernhäuser, R, Kröll, T, Krücken, R, Münch, M, Davinson, T, Gerl, J, Huber, G, Hurst, A, Iwanicki, J, Jonson, B, Lieb, P, Liljeby, L, Schempp, A, Scherillo, A, Schmidt, P, Walter, G
• Format: Journal Article
• Language: English
• Published: United States 06.05.2005
• ISSN: 0031-9007

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 deexcitation gamma-ray yields the B(E2;0(+)gs-->2(+)1) value of 30Mg 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 30Mg resides outside the "island of inversion."