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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Kernphysik / Spektroskopie
HK 15.5: Talk
Monday, March 10, 2008, 17:45–18:00, 2G
First identification of shape coexistence in 30Mg via electron spectroscopy — •W. Schwerdtfeger1,3, V. Bildstein2,3, L. Fraile4, R. Gernhäuser2,3, D. Habs1,3, R. Hertenberger1,3, P. Hoff5, U. Köster6, Th. Kröll2,3, R. Krücken2,3, R. Lutter1,3, H. Mach7, P. Ring1,3, P.G. Thirolf1,3, and K. Wimmer1,3 for the IS414 collaboration — 1Department of Physics, LMU München — 2E12, TU München — 3Maier-Leibnitz-Laboratorium, Garching — 4CERN, Geneva — 5Department of Chemistry, University of Oslo — 6ILL, Grenoble — 7Department of Radiation Sciences, Uppsala University
The 1789 keV level in 30Mg was unambiguously identified as the second excited 0+ state by measuring its E0 transition to the ground state via conversion electron spectroscopy. This level corresponds to the strongly deformed intruder 02+ state, thus proving for the first time shape coexistence in this nucleus at the borderline of the ’Island of Inversion’ around N ≈ 20. The matrix element ρ2(E0,02+ → 01+) = 3.6(7) · 10−3 allows to deduce the squared mixing amplitude a2 between the unperturbed lowest two 0+ states, indicating a rather weak coupling between the spherical and deformed configurations. The measurement was performed following the β decay of 30Na at the ISOLDE facility. *Supported by BMBF under contract 06 ML 234.