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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Kernphysik / Spektroskopie

HK 30.6: Vortrag

Mittwoch, 14. März 2007, 15:30–15:45, D

Mixed-symmetry states observed in inverse kinematics Coulomb excitation in the A = 130 region — •Tan Ahn^1,2, Norbert Pietralla², Georgi Rainovski⁴, Robert Janssens³, Christopher Lister³, Mike Carpenter³, Shaofei Zhu³, Volker Werner⁵, and Matt Chamberlain⁵ — ¹NSL, SUNY at Stony Brook, Stony Brook NY, USA — ²IKP, TU-Darmstadt, Darmstadt, Germany — ³Argonne National Lab, Argonne IL, USA — ⁴Sofia University, Sofia, Bulgaria — ⁵WNSL, Yale University, New Haven CT, USA

Inverse kinematics Coulomb excitation experiments have been performed to study the one-phonon 2_1,ms⁺ mixed-symmetry state in ^136,138Ce and ^{124,126,128,130,132,134}Xe nuclides at Argonne National Laboratory. Beams of these nuclei were accelerated with the ATLAS LINAC to 82% of the Coulomb barrier and shot onto a carbon target. The γ rays emitted from excited nuclei were observed with the Gammasphere array. Lifetimes of excited states were obtained from relative Coulomb excitation cross sections and multipole mixing ratios for γ-ray transitions were measured from the angular distribution of γ rays. B(M1) and B(E2) values were deduced from lifetime and multipole mixing ratio information, and measured branching ratios. One-phonon 2_1,ms⁺ states have been identified from the M1 strength distributions. The data are sensitive to the evolution of the 2_1,ms⁺ state as a function of valence nucleon numbers. Results of this investigation will be presented.