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HK: Physik der Hadronen und Kerne

HK 17: Kernphysik/Spektroskopie II - Rotationszust
ände

HK 17.4: Talk

Tuesday, March 20, 2001, 15:00–15:15, D

Study of high-spin structures in ⁸⁹Sr and ⁹⁰Sr — •E.A. Stefanova^1,2, R. Schwengner¹, G. Rainovski^1,3, K.D. Schilling¹, A. Wagner¹, F. Dönau¹, E. Galindo⁴, A. Jungclaus⁴, K.P. Lieb⁴, O. Thelen⁵, J. Eberth⁵, D.R. Napoli⁶, G. de Angelis⁶, M. Axiotis⁶, N. Marginean⁶, T. Martinez⁶, C.A. Ur⁶, T. Kröll⁷, A. Gadea⁸, and T. Kutsarova² — ¹Institut für Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden — ²Institute for Nucl. Res. and Nucl. Energy, BAS, 1784 Sofia, Bulgaria — ³Faculty of Physics, Univ. Sofia, 1164 Sofia, Bulgaria — ⁴II. Physikal. Inst., Univ. Göttingen, 37073 Göttingen — ⁵Inst. für Kernphysik, Univ. zu Köln, 50937 Köln — ⁶INFN, Lab. Naz. di Legnaro, 35020 Legnaro, Italy — ⁷INFN and Dipart. di Fisica dell’Univ. di Padova, 35131 Padova, Italy — ⁸Inst. de Fisica Corpuscular, 46071 Valencia, Spain

High-spin states of ⁸⁹Sr and ⁹⁰Sr were studied via the reactions ⁸²Se(¹¹B,p4n) and ⁸²Se(¹¹B,p3n), respectively, at a beam energy of 37 MeV. Gamma rays were detected with the GASP spectrometer. The level schemes of ⁸⁹Sr and ⁹⁰Sr were extended up to spin J ≈ 27/2 at E_x ≈ 8 MeV and J ≈ 17 at E_x ≈ 10 MeV, respectively. The level structures in ⁸⁹Sr and ⁹⁰Sr are interpreted in terms of the shell model using the model space π(0f_5/2,1p_3/2,1p_1/2,0g_9/2) ν(1p_1/2,0g_9/2,1d_5/2). Excited states in ⁸⁹Sr can be characterized by coupling the unpaired 1d_5/2 neutron to proton excitations of the core nucleus ⁸⁸Sr. An equidistant level sequence with Δ J = 2 found in ⁹⁰Sr is well described by the configuration π[(0f_5/2⁻²) (0g_9/2²)] ν(1d_5/2²) which favours even spins.