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Erlangen 2001 – scientific programme

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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. Stefanova1,2, R. Schwengner1, G. Rainovski1,3, 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. Kutsarova21Institut 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 Ex ≈ 8 MeV and J ≈ 17 at Ex ≈ 10 MeV, respectively. The level structures in 89Sr and 90Sr are interpreted in terms of the shell model using the model space π(0f5/2,1p3/2,1p1/2,0g9/2) ν(1p1/2,0g9/2,1d5/2). Excited states in 89Sr can be characterized by coupling the unpaired 1d5/2 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[(0f5/2−2) (0g9/22)] ν(1d5/22) which favours even spins.

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