Electro-excitation of the 1+ state at Ex = 3.486 MeV in 88Sr

Abstract The differential cross section for excitation of the 1 + state at E x = 3.486 MeV in 88 Sr by inelastic electron scattering has been measured for values of the momentum transfer f between 0.22 and 2.57 fm −1 . Both nuclear core polarization and Δ -hole polarization seem to be necessary to describe the observed reduction of the B (M1) value and data at low q and the behaviour of the cross section at intermediate values of q .