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HK: Physik der Hadronen und Kerne

HK 17: Kernphysik/Spektroskopie II - Rotationszust
ände

HK 17.2: Talk

Tuesday, March 20, 2001, 14:30–14:45, D

Transition Strengths in Magnetic Dipole Bands in ⁸²Rb, ⁸³Rb and ⁸⁴Rb — •R. Schwengner¹, G. Rainovski^1,2, H. Schnare¹, A. Wagner¹, F. Dönau¹, M. Hausmann³, O. Iordanov³, A. Jungclaus³, K.P. Lieb³, D.R. Napoli⁴, G. de Angelis⁴, M. Axiotis⁴, F. Brandolini⁵, N. Marginean⁴, and C. Rossi Alvarez⁵ — ¹Institut für Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden — ²Faculty of Physics, Univ. Sofia, 1164 Sofia, Bulgaria — ³II. Physikal. Inst., Univ. Göttingen, 37073 Göttingen — ⁴INFN, Lab. Naz. di Legnaro, 35020 Legnaro, Italy — ⁵INFN and Dipart. di Fisica dell’Univ. di Padova, 35131 Padova, Italy

We have studied magnetic dipole sequences of ⁸²Rb, ⁸³Rb and ⁸⁴Rb using the reaction ¹¹B + ⁷⁶Ge (E = 45 MeV) at the XTU tandem accelerator of LNL at Legnaro. Gamma rays were detected with the spectrometer GASP. Level lifetimes were deduced from a lineshape analysis applying the Doppler-shift-attenuation method. The transition strengths in the regular M1 bands in the odd-odd isotopes ⁸²Rb and ⁸⁴Rb support the interpretation in terms of magnetic rotation. The experimental transition strengths in ⁸³Rb show an irregular behaviour which is considered to be a consequence of the breakup of a neutron pair in this odd-even isotope.