Abstract
The form factor for excitation of the 1+ state at 3.48 MeV in88Sr by inelastic electron scattering has been measured for momentum transfersq=0.24–0.62 fm−1. Neither its magnitude nor shape can be described employing the best available nuclear wave functions. We demonstrate with a schematic model that the observed reduction of the form factor may be understood by taking into account a renormalization of theM1-operator due to virtualΔ-hole excitations.
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Part of this work was sponsored by the “Stichting voor Fundamenteel Onderzoek der Materie (FOM)”, which is financially supported by the“Netherlandse Organisatie voor Zuiver Wetenschappelijk Onderzoek (ZWO)”, and by the “Deutsche Forschungsgemeinschaft”
We like to thank Dr. E. Spamer for his help during the measurements and Professor W. Weise for stimulating discussions and suggestions concerning the analysis.
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van der Bijl, L.T., Blok, H.P., Frey, R. et al. Quenching of the electron scattering form factor of the 1+ state at 3.48 MeV in88Sr and the influence of theΔ(1232)-isobar. Z Physik A 305, 231–234 (1982). https://doi.org/10.1007/BF01417439
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DOI: https://doi.org/10.1007/BF01417439