Abstract
Recent (p,n) experiments at intermediate energy at the Indiana University Cyclotron have been used to study the spin‐isospin transfer response function of nucclei. In particular forward angle spectra are dominated by neutron peaks characterized with ΔL=0 transfer, which have identified as Gamow‐Teller (GT) 1+ states. The GT strength function in nuclei throughout the periodic table is presented. The sum of the total observed GT strength is compared to a model independent sum rule to obtain an A dependence of the quenching. General features of GT strength distributions are presented and discussed. A especial effort is made to estimate how much of the GT strength resides at excitation energies between 20−40 MeV. The fact that less GT strength is observed than is expected (either calculations or sum rule) may be associated with intrinsic nucleon degrees of freedom, in particular the excitation of Δ‐hole states.
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