Abstract
High resolution inelastic electron scattering at low momentum transfer yields the precise location of states with J π, T = 1 +, 1 in 28 Si at excitation energies E x = 10.594, 10.725, 10.901, 11.445 and 12.331 MeV with an overall energy uncertainty of about ±1 keV. An analysis of the inelastic cross sections to these states in terms of the DWBA with RPA wave functions from the model of separable interaction (MSI) yields a total isovector strength of ΣΓ γ 0 = 34.40±1.37 eV. This result is compared to RPA and open-shell model calculations and it is shown that M1 spin-flip transitions seem to be a sensitive tool to investigate ground state correlations. A qualitative comparison of the M1 transitions with analogous charge exchange reactions involving hadrons and radiative pion and muon capture is also made.
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