Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 67: Poster Session
HK 67.57: Poster
Thursday, March 19, 2009, 14:00–16:00, Audi-Max
Coulomb Excitation of 148Sm — •Thomas Möller1, Tan Ahn2, Michael Carpenter3, Laurent Coquard1, Robert Janssens3, Jörg Leske1, Norbert Pietralla1, and Georgi Rainovski4 — 1Institut für Kernphysik, TU Darmstadt — 2WNSL, Yale University, New Haven, CT, USA — 3Argonne National Laboratory, Argonne, IL, USA — 4Faculty of Physics, St. Kliment Ohridski University Sofia, Bulgaria
The isovector one-phonon quadrupole excitation of the valence shell, the 21,ms+ mixed-symmetry state, is a fundamental excitation mode of vibrational-type nuclei [1]. In order to investigate the evolution of the 21,ms+ state in the chain of Sm isotopes, Coulomb-excitation experiments in inverse kinematics on 148Sm and 154Sm have been performed at Argonne National Laboratory. Beams of these isotopes were accelerated by the ATLAS accelerator and shot onto a 12C target with energies of 550 MeV and 570 MeV, respectively, corresponding to approximately 85% of the Coulomb barrier. Deexcitation gamma rays have been detected by the Gammasphere spectrometer. Lifetimes of excited states could be calculated from observed Coulomb excitation cross sections. For the 21,ms+ state in 148Sm the M1 strength for its decay to 21+ could be deduced and compared to previous measurements [2]. Results of the analysis of 148Sm will be presented. [1] N. Pietralla et al., Prog. Part. Nucl. Phys. 60, 225 (2008); [2] T. C. Li et al., Phys. Rev. C 71, 044318 (2005); Supported by the DFG