Parts | Days | Selection | Search | Downloads | Help

HK: Fachverband Hadronen und Kerne

HK 58: Nuclear Structure and Dynamics I

HK 58.7: Talk

Wednesday, March 18, 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).