Abstract
The fine structure observed in high resolution inelastic electron scattering spectra for208Pb in the excitation energy range of the isoscalar giant quadrupole resonance has been analysed with a fluctuation analysis technique. The obtained density of levels as a function of excitation energyE x has then been used as a constraint for the shape and magnitude of the (radiative) background subtracted spectra subjected to a multipole decomposition. The derivedE2 strength in the region 8.0≦E x≦11.5 MeV exhausts (50 +15−7 % of the energy weighted sum rule. TheE2 strength found is considerably larger than previously estimated from the same spectra and it is now both in shape and magnitude in good agreement with results from a recent208Pb(e, e′n) coincidence experiment.
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Dedicated to Professor Friedrich Beck on the occasion of his 60th birthday
Supported by Deutsche Forschungsgemeinschaft
We are very grateful to F. Beck for his help and inspiration during the course of development of the statistical analysis techniques of high-resolution spectra. One of us (A.R.) thanks R. Broglia for frequent discussions over the years on the structure and strength of the GQR in208Pb and in particular L. Cardman who insisted continuously but friendly that something could not be quite right with our publishedE2 strength distribution and who thus got us started on the fairly sophisticated, time consuming and finally successful analysis presented here.
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Kilgus, G., Kühner, G., Müller, S. et al. Isoscalar quadrupole giant resonance in208Pb: A statistical analysis of high-resolution inelastic electron scattering spectra. Z. Physik A - Atomic Nuclei 326, 41–50 (1987). https://doi.org/10.1007/BF01294569
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DOI: https://doi.org/10.1007/BF01294569