[en] The γ-rays following the reactions induced by ¹²C ions on ¹¹⁵In, ¹¹²Sn, ¹¹⁷Sn, ¹²²Sn and ¹²³Sb targets have been investigated using six NaI(Tl) detectors in a two-dimensional arrangement. The collective moment of inertia Isub(band)sup((2)) of ¹¹⁸Xe, ¹²²Xe, ¹²³Cs and ¹²⁸Ba, ¹³⁰Ba have been extracted from the energy-correlation spectra. The behaviour of these nuclei and the observed differences are interpreted in terms of high-spin collective properties. Data are also presented on the effective moment of inertia Isub(eff)sup((2)) of ¹¹⁸Xe and ¹³⁰Ba measured by sum-spectrometer techniques