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By using the Q3D magnetic spectrograph of the Maier-Leibnitz-Laboratorium at Munchen, particle-hole states in 208Pb are investigated. The reaction 208Pb(p, p') via seven known isobaric analog resonances in 209Bi and the reaction 207Pb(d,p) were studied. An instrumental resolution of about 3keV for protons without energy loss in the target is achieved; depending on the effective target thickness the peak shape becomes asymmetric with a tail of 3-8 keV width. A dozen doublets of states at less than 2 keV or even vanishing distance are resolved by the selective excitation in different analog resonances. For excitation energies 3.9 < Ex6.1 MeV in 208Pb, 80 states with negative parity and 30 states with positive parity are predicted by the shell model. Most states are identified and work is going on to determine their structure.

High resolution particle spectroscopy in208Pb with the Q3D magnetic spectrograph of the Maier-Leibnitz-Laboratorium at München

High resolution particle spectroscopy in²⁰⁸Pb with the Q3D magnetic spectrograph of the Maier-Leibnitz-Laboratorium at München