Study on the sup(123, 125)I excited states from the sup(123, 125)Xe decay

For the purpose of determining and specifying quantum characteristics of the upper excited states of sup(124, 125)I the spectra of electrons of internal conversion (EIC) appearing in the course of sup(123, 125)Xe decay in the 110-1200 keV energy range have been measured. The measurements have been performed at a β spectrometer with Si(Li) detector placed in an uniform magnetic field, the resolution of the spectrometer constituting in average 2.5 keV. The experimental information obtained has been processed at the ''Minsk-2'' computer (preliminary stage) and at the CDC-6500. The results of EIC spectra measurements in the 123Xe and 125Xe decay are tabulated. Presented are not all the transitions appearing in the sup(123, 125)Xe decay but only those, which become apparent in the EIC spectra. As a result of calculations of internal conversion coefficients and their comparison with theoretical values it become ossible to determine for the first time the multipolarities of 18γ transitions in 123I and 9 γ transitions in 125I. Multipolarities of transitions of 178 keV in 123I and 188, 372, 453 keV in 125I coincide with those obtained in the experiment. The multipolarity of 330 keV γ transition in 123I is determined. This is M 1-transition. It has been found that the levels 1011, 1048, 1113, 1242, 1310, 1390, 1864, 1934 kev (123I) and 1007, 1089, 1180, 1381 keV (125I) may have either 1/2+ or 3/2+ spin