Abstract
The isospin-forbidden electroexcitation of the 1 −, T = 0 state at 7.12 MeV in 16O has been studied for momentum transfers q = 0.22 − 0.49 fm −1. The form factor at these momentum transfers is determined by the sum of the isospin T = 0 part and a T = 1 contribution. A single particle-hole harmonic oscillator shell model calculation reproduces the q-dependence of the measured form factor which shows that the isovector contribution interferes destructively with the isoscalar part and has a strength of about 2% of the T = 0 amplitude.
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