Erlangen 2001 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 12: Postersitzung: Kernphysik/Spektroskopie

HK 12.9: Poster

Tuesday, March 20, 2001, 10:30–12:45, R

A scissors-like excitation on top of the quadrupole vibrational state in ⁸⁸Sr — •L. Käubler¹, H. Schnare¹, R. Schwengner¹, H. Prade¹, F. Dönau¹, E. Grosse^1,2, K.D. Schilling¹, A. Wagner¹, and the Köln - Darmstadt - Sofia collaboration³ — ¹Inst. f. Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden — ²TU Dresden, 01062 Dresden — ³Inst. f. Kernphysik, Uni zu Köln, 50937 Köln – Inst. f. Kernphysik, TU Darmstadt, 64289 Darmstadt – Inst. of Nuclear Research and Nuclear Energy, Sofia, BG-1784 Sofia

A (γ,γ’) experiment on ⁸⁸Sr has been performed at the S-DALINAC accelerator of the TU Darmstadt. In the search for the 1⁻ two-phonon state with the structure (2₁⁺ ⊗ 3₁⁻) in the N=50 nucleus ⁸⁸Sr we found angular momentum and parity J^π=1⁺ for the 4.742 MeV state [1]. Four further dipole states have been observed in the energy region 4.5 MeV ≤ E_x ≤ 5.5 MeV. The deexcitation pattern of the J^π=1⁺ state at 4.742 MeV in ⁸⁸Sr is similar to that of the scissors mode observed in ⁹⁴Mo [2]. Therefore the 4.742 MeV state is proposed to be a scissors-like state in the spherical nucleus ⁸⁸Sr on top of the quadrupole vibrational state. This scissors-like excitation may arise from a superposition of the isoscalar and isovector quadrupole vibrations.
[1] L. Käubler et al., Eur. Phys. J. A7 (2000) 15
[2] N. Pietralla et al., Phys. Rev. Lett. 83 (1999) 1303
^*Supported by the DFG, contract Gr-1674/1-1, and the SMWK, contract 7533-70-FZR/702.