Isobaric analogue resonances in 127I, 125I and 123I

Abstract

Isobaric analogue resonances in 127I, 125I and 123I have been studied by (p, p) and (p, p') scattering in the range of incident energies 7.54 to 12.50 MeV, 7.30 to 11.04 MeV from 126Te and 124Te, respectively, and in the ranges of 6.70 to 7.76 MeV and 8.51 to 11.20 MeV from 122Te. The energy differences between the resonances and the orbital angular momenta transferred in their formation agree very well with the corresponding analogue states which have been previously observed by the (d, p) reaction on the same target nuclei. There is fairly good agreement between the corresponding spectroscopic factors. The Coulomb displacement energies were found to be 13.996 ± 0.02, 14.060 ± 0.02 and 14.109 ± 0.02 MeV for the pairs of isotopes 127Te- 127I, 125Te- 125I and 123Te- 123I respectively. Spins of some prominent resonances have been deduced from the angular distributions of the inelastic protons. The strong inelastic scattering observed through some odd-parity resonances is discussed in terms of the core excitation model.