Parts | Days | Selection | Search | Downloads | Help

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 2_1,ms⁺ mixed-symmetry state, is a fundamental excitation mode of vibrational-type nuclei [1]. In order to investigate the evolution of the 2_1,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 2_1,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