Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 48: Nuclear Structure and Dynamics I

HK 48.5: Talk

Wednesday, March 18, 2009, 15:00–15:15, H-ZO 40

Study of ¹³³Ba with the (d^→,p) reaction — •G. Suliman¹, D. Bucurescu¹, C. Rusu², R. Hertenberger³, H.-F. Wirth³, T. Faestermann⁴, R. Krücken⁴, T. Behrens⁴, V. Bildstein⁴, K. Eppinger⁴, C. Hinke⁴, M. Mahgoub⁴, P. Meierbeck⁴, M. Reithner⁴, S. Schwertel⁴, and N. Chauvin⁵ — ¹IFIN-HH, Bucharest, Romania — ²University of Texas at Dallas, USA — ³LMU, Garching, Germany — ⁴TUM, Garching, Germany — ⁵CSNSM, Orsay, France

Shape phase transitions were mainly studied in even-even nuclei, and less in odd-mass nuclei where the structure is more complex. The Ba isotopes with N<80 form a transitional region from vibrators (U(5) IBM limit) to γ-soft nuclei (O(6) limit), with ¹³⁴Ba showing features of the E(5) symmetry, the critical point of the U(5) to O(6) transition. Studies of the odd-mass neighbors of ¹³⁴Ba are of interest to see how criticality is changed by the coupling of the odd particle. Different critical point solutions have been proposed for this region, like E(5/4) or E(5/12).

We present a study of the ¹³³Ba nucleus with the direct (d^→,p) reaction at 24 MeV. The experiment was performed at the Munich tandem with polarized deuteron beam, and the Q3D spectrometer. A DWBA analysis of the measured angular distributions and analyzing powers provided unambiguous J^π assignments for most of the observed levels up to 2.2 MeV excitation. The results are discussed in comparison with the predictions of critical point models, IBFM, and spherical shell model calculations.