Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 58: Nuclear Structure and Dynamics I
HK 58.7: Vortrag
Mittwoch, 18. März 2009, 18:15–18:30, H-ZO 40
Low-lying collective states in the O(6)-like nucleus 126Xe — •Laurent Coquard1, Norbert Pietralla1, Georgi Rainovski2, Tan Ahn3, Robert Janssens4, and Michael Carpenter4 — 1Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany — 2Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria — 3WNSL, Yale University, New Haven, CT 06520, USA — 4Argonne National Laboratory, 700 South Cass Avenue, Argonne, Illinois 60439, USA
Low-lying collective excited states in 126Xe have been investigated via the 12C(126Xe,126Xe*) Coulomb excitation reaction @ 85% of the Coulomb barrier (399MeV) at the Gammasphere Ge-detector array at the Argonne National Laboratory. Absolute E2 transitions strengths have been obtained from the COULEX cross sections that were deduced from the relative γ-ray yields as in [1]. These experimental values are then compared with the theoretical values calculated within the Interacting Boson Model [2,3] near the O(6) limit. The agreement between the measured B(E2) values and the ones predicted by the IBM, on an absolute scale, enables us to understand the decay of the low-lying collective states in terms of σ and τ selection rules for the O(6)-like nucleus 126Xe.
[1] G. Rainovski et al, Phys. Rev. Lett. 96, 122501 (2006).
[2] A. Arima and F. Iachello, Phys. Rev. Lett. 40, 385 (1978).
[3] F. Iachello and A. Arima, The Interacting Boson Model (Cambridge University Press, Cambridge, 1987).