Electroexcitation of the first excited state in 39K

Abstract Electroexcitation of the first excited state in 39 K has been studied in the momentum transfer region of 0.8–2.5 fm −1 . Separation of the longitudinal and transverse form-factor components has been obtained. The longitudinal form factor has been analyzed model-independently. A B (M1) value for this l -forbidden transition was also obtained. Presently available theoretical predictions are unable to reproduce the B (M1) value or the transverse form-factor data.