Angular distribution of gamma rays emitted by oriented nuclei: the case of Mo-92 formed in the reaction Li-6+Y-89

Gamma-ray angular distributions in oriented Mo-92 produced via the Li-6+Y-89 reaction were studied in this work. The characteristic gamma rays in Mo-92 were measured by means of the GALILEO array, which is composed of 25 Compton-suppressedHPGedetectors arranged in a nearly 2 pi geometry. A detailed analysis of the spin-alignment attenuation factors (alpha(2)) for different excited states in Mo-92 was performed, by analyzing the measured angular distribution coefficients of several pure-E2 transitions. The relationship between alpha(2) and the spinwas established in (92)Moand the 244-keV transition between the 5(1)(-) and 4(1)(+) states resulted to have a E1 + M2 character with a mixing ratio (delta) of -0.05(-0.06)(+0.05), consistent with shell model calculations.