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Gamma-ray angular distributions in oriented 92 Mo produced via the 6 Li+ 89 Y reaction were studied in this work. The characteristic γ rays in 92 Mo were measured by means of the GALILEO array, which is composed of 25 Compton-suppressed HPGe detectors arranged in a nearly 2 π geometry. A detailed analysis of the spin-alignment attenuation factors ( α 2 ) for different excited states in 92 Mo was performed, by analyzing the measured angular distribution coefficients of several pure-E2 transitions. The relationship between α 2 and the spin was established in 92 Mo and the 244-keV transition between the 5 1 - and 4 1 + states resulted to have a E1 + M2 character with a mixing ratio (δ ) of - 0. 05 - 0.06 + 0.05 , consistent with shell model calculations. [ABSTRACT FROM AUTHOR]

Quasi-elastic scattering angular distribution for the 94.5 MeV 17 F radioactive ion beam on the 208 Pb target has been measured. To describe the experimental quasi-elastic scattering angular distribution and explore the reaction dynamic, firstly, the optical potentials with the double-folding São Paulo and Akyüz Winther potentials for both real and imaginary parts were used to analyze the experimental data. It is observed that both theoretical angular distributions are very similar. The optical model results describe reasonably the experimental data until 100 ∘ but underpredict the data for larger angles. Secondly, the continuum discretized coupled channel method (CDCC) was used to study the effect of the breakup channel on the elastic scattering. The double-folding São Paulo and Akyüz Winther potentials were used as nuclear interactions giving again similar results. The agreement with the data is slightly improved at intermediate angles. The sensibility of the CDCC effects upon the nuclear interaction potential was checked. Finally, the influence of inelastic states of both projectile and target, the one-proton, one-neutron, two-neutron and α transfer channels on the quasi-elastic scattering angular distribution is analyzed in the frame of the coupled channel and coupled reaction channel methods, respectively. It is observed that the coupling to the first excited state of 17 F is the one that affects more the elastic scattering, although the inelastic channels of the target also influence it when compared with the optical model results. The effect of the transfer channels on the quasi-elastic angular distribution is negligible. [ABSTRACT FROM AUTHOR]

The measurement of one-neutron stripping cross sections for the 89Y(6Li,5Li)90Y* reaction at 22 MeV and 34 MeV is reported, using both in-beam and off-beam γ-ray spectroscopy methods. Characteristic γ lines of 90Y are clearly identified by both the γ-γ and proton-γ coincidence methods. The obtained cross section of one-neutron stripping at 34 MeV is found to be much smaller than that at 22 MeV. The one-neutron stripping cross sections measured for this system have the same order of magnitude as the one measured for the same reaction for the 6Li+96Zr system at energies around the Coulomb barrier. Parameter-free coupled reaction channel calculations agree quite well with the experimental data. Theoretical study of the effect of the one-neutron transfer on the elastic total fusion cross section is performed. [ABSTRACT FROM AUTHOR]