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HK: Fachverband Hadronen und Kerne
HK 58: Nuclear Structure and Dynamics I
HK 58.2: Talk
Wednesday, March 18, 2009, 17:00–17:15, H-ZO 40
One-phonon excitations of 92Zr from electron scattering * — •A. Scheikh Obeid, C. Walz, O. Burda, M. Chernykh, A. Krugmann, I. Poltoratska, and N. Pietralla — Institut für Kernphysik, Technische Universität Darmstadt, Germany
Low-lying collective vibrational excitations in 94Mo have previously been investigated with electron scattering experiments [1] at the 130 MeV superconducting electron accelerator S-DALINAC. The evaluation of the measured form factors as a function of momentum transfer had supported the one-phonon interpretation of symmetric and mixed-symmetric states (MSSs) which have been defined in the framework of IBM-2. In the neighbouring even-even isotone 92Zr formed by N=52 neutrons with two valence neutrons and Z=40 with no protons occupying the π(g9/2) sub-shell a stronger configurational isospin polarization of the one-phonon states than in 94Mo is expected [2]. In order to verify this expectation, a new electron scattering experiment at the S-DALINAC has been performed. Our data and a comparison to the momentum-transfer dependence of the form factor of the 2+ states will be presented. The E2 transition strength of the one-quadrupole phonon states and the E3 transition strength of the one-octupole phonon state have been extracted and will be compared to previously derived spectroscopic data on MSSs of 92Zr [3].
[1] O. Burda et al, Phys. Rev. Lett. 99, 092503 (2007).
[2] J. D. Holt et al, Phys. Rev. C 76, 034325 (2007).
[3] C. Fransen et al, Phys. Rev. C 71, 054304 (2005).
* Supported by the DFG through SFB 634.