High-spin states in ½¿ ½¿ Ba, ½¿ La, ½¿ Ce, ½¿ Nd were populated following (HI, Ò) reactions and subsequent radiation was studied using in-beam -ray spectroscopy methods. Level schemes with new states belonging to the above mentioned nuclei are given. These nuclei situated near AE ¼ have been analysed within the framework of the interactingboson model (IBM), applied to the description of even-even, odd-even and odd-odd nuclei to calculate excitation energies and electromagnetic properties for the above mentioned nuclei.