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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Kernphysik / Spektroskopie

HK 30.4: Vortrag

Mittwoch, 14. März 2007, 15:00–15:15, D

Nature of mixed-symmetry 2⁺ states in ⁹⁴Mo from high-resolution electron and proton scattering — •O. Burda¹, N. Botha², J. Carter³, R.W. Fearick², S. Förtsch⁴, J.D. Holt⁵, C. Fransen⁶, H. Fujita^3,4, M. Kuhar¹, A. Lenhardt¹, P. von Neumann-Cosel¹, R. Neveling⁴, N. Pietralla¹, V.Yu. Ponomarev¹, A. Richter¹, O. Scholten⁷, E. Sideras-Haddad³, F.D. Smit⁴, and J. Wambach¹ — ¹Institut für Kernphysik, Technische Universität Darmstadt — ²Physics Department, University of Cape Town — ³School of Physics, University of the Witwatersrand — ⁴iThemba LABS, Somerset West — ⁵Department of Physics, SUNY, Stony Brook — ⁶Institut für Kernphysik, Universität zu Köln — ⁷Kernfysisch Versneller Instituut, University of Groningen

The concept of fully symmetric (FS) and mixed-symmetry (MS) quadrupole phonons as building blocks of the low-energy structure in spherical nuclei has been investigated in recent years. The nucleus ⁹⁴Mo is a well studied example and the one-phonon and two-phonon MS states have already been established. High-resolution electron scattering (at the S-DALINAC) and proton scattering (at the iThemba LABS) experiments were performed studying the excitation of 2⁺ states. The measured momentum-transfer dependence of (e,e^′) and (p,p^′) cross sections permits a test of the nature of proposed one- and two-phonon FS and MS 2⁺ states and their isospin character in the valence shell. Comparison to QPM, shell-model and IBA-2 calculations is presented.
^*Supported by the DFG through SFB 634 and Ne 679/2-1.