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The y-ray spectra of the " Cd(p, ny)" In and ' Ag(a, ny)" In reactions were measured with Ge(Li) spectrometers for bombarding energies of 4.8 MeV protons and 17.1 MeV a particles. The energies and relative intensities of 79 " In y-ray transitions have been determined. The electron spectra were measured with combined magnet plus Si(Li) as well as superconducting magnetic lens plus Si(Li) spectrometers. Internal conversion coeScients of 40 " In transitions have been determined, and the level scheme of " In, y-ray branching ratios and transition multipolarities have been deduced. Computed Hauser-Feshbach (p,n) cross sections were compared with experimental ones, obtained from y-ray measurements.On the basis of the internal conversion coeScients and Hauser-Feshbach analysis, level spins and parities have been determined. The energies of several " In proton-neutron multiplets were calculated on the basis of the parabolic rule derived from the cluster-vibration model. The level energy spectrum and electromagnetic properties were calculated on the basis of the interacting boson-fermion-fermion/odd-odd truncated quadrupole phonon model and satisfactory agreement was obtained between the experimental and theoretical results. More than 20 p-n multiplet states have been identified in " In.

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