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Phys. Rev. C 70, 064307 (2004) [10 pages]

Dipole and quadrupole excitations in 88Sr up to 6.8 MeV

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L. Käubler1, H. Schnare1, R. Schwengner1, H. Prade1, F. Dönau1, P. von Brentano2, J. Eberth2, J. Enders3, A. Fitzler2, C. Fransen2, M. Grinberg4, R.-D. Herzberg2,*, H. Kaiser3,†, P. von Neumann-Cosel3, N. Pietralla2,5, A. Richter3, G. Rusev1,4, Ch. Stoyanov4, and I. Wiedenhöver2,‡
1Institut für Kern- und Hadronenphysik, FZ Rossendorf, Postfach 510119, 01314 Dresden, Germany
2Institut für Kernphysik, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany
3Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
4Institute for Nuclear Research and Nuclear Energy, BAS, 72 Tzarigradsko Chaussee, 1784 Sofia, Bulgaria
5Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794, USA

Received 30 August 2004; published 10 December 2004

Dipole and quadrupole excitations in the semimagic N=50 nucleus 88Sr were investigated at the superconducting Darmstadt electron linear accelerator S-DALINAC with bremsstrahlung of an end-point energy of 6.8 MeV. Many new dipole excitations could be identified, and their reduced excitation probabilities were determined. The experimental findings are discussed in the context of quasiparticle-phonon-model and shell-model calculations. A breaking of the N=50 core is essential to describe the structure of the observed excitations. The two-phonon quadrupole-octupole Jπ=1− state exhibits unusual features which are presently not understood.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.70.064307
DOI:
10.1103/PhysRevC.70.064307
PACS:
25.20.Dc, 21.10.Tg, 23.20.−g, 27.50.+e

*Present address: Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, U.K.

†Present address: Ingenieurbüro Fritz, 64683 Einhausen, Germany.

‡Present address: Physics Department, Florida State University, Tallahassee, FL 32306.

 
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