A comparative study of proton states in 121,123,125,127,129,131I excited by (α, t) and (3He,d) reactions

Proton states in ^{121,123,125,127,129,131}I were investigated by means of Te(α, t)I and Te(³He, d)I reactions at 36 MeV bombarding energy using a Q3D magnetic spectrograph. Angular distributions were measured for transitions to ¹²¹I. From ratios of cross sections of transitions in the reactions (³He, d) and (α, t) to final states in ^125–131I, the transfered orbital angular momenta and relative spectroscopy factors are extracted. New levels are observed including $\text{7}\text{2}{}^{\mathrm{+}}\text{and}\text{11}\text{2}{}^{\mathrm{?}}$ single-particle strength fragments. The results are interpreted using the three-particle-cluster — phonon coupling model.