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HK: Physik der Hadronen und Kerne

HK 12: Physik mit schweren Ionen III / Kernphysik

HK 12.10: Vortrag

Montag, 20. März 2000, 19:00–19:15, B 98

Study of quadrupole moments of superdeformed bands in ¹⁴⁵Gd — •T. Rzaca-Urban¹, A. Pasternak², R.M. Lieder³, W. Urban¹, M. Rejmund¹, S. Utzelman³, H.J Jensen³, W. Gast³, H. Jäger³, D. Bazzacco⁴, R. Menegazzo⁴, S. Lunardi⁴, C. Rossi Alvarez⁴, G. de Angelis⁵, N. Medino⁵, and D.R. Napoli⁵ — ¹IEP, Univ. Warsaw, PL-00-681 Warsaw — ²IPTI, RU-194021 St. Petersburg, — ³IKP, FZ Jülich, D-52425 Jülich — ⁴INFN, Sezione di Padova, I-35131 Padova — ⁵INFN, LNL, I-35020 Legnaro

Since the quadrupole moment depends sensitively on the specific orbitals which are occupied, it becomes an important quantity to verify the configuration of a superdeformed (SD) band. Mean lifetimes have been measured for SD bands of ¹⁴⁵Gd with DSAM. High-spin states in ¹⁴⁵Gd have been populated in the ¹¹⁴Cd(³⁶S,5n) reaction at 182 MeV and studied with GASP at the LNL, Italy. Quadrupole moments of Q₀ = 11.8 ± 0.8 eb and 13.5 ± 1.0 eb have been obtained for the yrast and first excited SD bands. The interpretation of these results requires a modification of the previous configuration assignments [1]. For the configuration assignment to the yrast SD band one should take into account the π [404]9/2 configuration and that the ν [514]9/2 orbital is not crossed by the ν 7₁ intruder orbital. Our new configuration assignments are π 6¹ π [404]9/2 ν [514]9/2 ν 7 ⁰ for the yrast SD band and π 6² ν [642]5/2 ν 7⁰ for the first excited SD band between the two crossings. (Supported by the Volkswagen Foundation and KBN).

[1] T. Rzaca-Urban et al., Z. Phys. B 356, 456 (1995)