Pesquisa | SciELO

The excited states in 193Ir populated by the beta- decay of 193Os were investigated via gamma-gamma coincidence analysis. Three levels at 517, 563 and 621 keV, previsouly seen only in nuclear reaction studies, were observed in the present measurements; the 487 keV transition from the 849 keV level was identified, providing good evidence that the levels at 848.93 and 849.083 keV are the same. The level at 807 keV was positively identified through both the 449 and 668 keV transitions; also, there is evidence for four new levels at 880, 882, 890 and 986 keV, and several newly-found gamma transitions were identified and placed in the decay scheme.

The propagation of the struck proton through the nuclear medium is studied in the semi-classical multicolli-sional internuclear cascade approach. The probability of formation of various residual nucleus configurations and the corresponding excitation energies were obtained as a function of the energy omega transferred to the proton by the knockout.

A method of analysis for gamma angular correlation experiments was developed for the case of a multi-detector setup, tested with several known sources of radiation, and applied in the decay of the 155Eu nucleus. The method has shown good reliability. This method was applied for five cascades for the transitional nucleus 155Eu and produced the following results: delta(65 keV) = 0.09(11), delta(203 keV) = -0.44(17), delta(246 keV) = 0.281(22), delta(664 keV) = -0.231(21), delta(1002 keV) = -0.35(6).

The ratio of the differential cross sections for the reactions 7 Li(p, 2p)6 He and 7 Li(p, pn)6 Li, at incident proton energy of 70 MeV, were analyzed in the framework of DWT approach. FSI and off-shell contributions were factorized and compared with appropriate experimental data.

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