Crucial Test for theΔ(1232)-Hole Effect: (n, p) vs (p, n)

The polarization of magnetic states by $\Delta \mathrm{}\left(1232\right)\mathrm{}$-hole admixtures has been suggested as a possible mechanism to explain missing magnetic strength. Charge-exchange reactions on neutron excess targets may populate $2\hslash \omega$ spin-isospin flip states which have small hadronic form factors at low momentum transfers. Since the $\Delta \mathrm{}\left(1232\right)\mathrm{}$ admixture produces ground-state-like form factors, an enhancement of the cross section at extreme forward angles is expected.