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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Kernphysik / Spektroskopie I
HK 48.7: Vortrag
Freitag, 14. März 2008, 15:45–16:00, 2E
Measurements of lifetimes and magnetic moments of 2+ states in the even stable Sn isotopes 112,114,116Sn — Jennifer Walker1, •Andrea Jungclaus1, Joerg Leske2, Stephane Pietri3, Karl-Heinz Speidel4, Pieter Doornenbal5, Jürgen Gerl5, Namita Goel5, Ivan Kojouharov5, Wawcek Prokopowicz5, Henning Schaffner5, Hans-Juergen Wollersheim5, Babak Alikhai2, Joakim Cederkall6, Andreas Ekstroem6, Roman Gernhäuser7, Peter Maier-Komor7, Victor Modamio1, and Ronald Schwengner8 — 1Universidad Autonoma de Madrid — 2TU Darmstadt — 3University of Surrey — 4Universitaet Bonn — 5GSI Darmstadt — 6University of Lund — 7TU München — 8FZ Rossendorf
Recently, an unexpected behaviour of B(E2; 0+*2+) transition strengths in the Sn isotopic chain has been established in a series of experiments. Coulomb excitation measurements on radioactive neutron-deficient 106-110Sn as well as stable 112,114Sn beams have shown an excess of transition strength in these isotopes in which the lower half of the N=50-82 neutron shell is filled. To gain more experimental information about the origin of this behaviour we have measured the magnetic moments and lifetimes of the 2+ states in the stable isotopes 112,114,116Sn using the transient field technique in combination with Coulomb excitation in inverse kinematics. Isotopically pure Sn beams were provided by the UNILAC of GSI and the γ-rays detected in four EUROBALL Cluster detectors in coincidence with recoiling carbon ions registered in an array of four Si pin diodes.