M. Davidson

Heavy ion induced X-ray emission work at the TANDAR laboratory in Buenos Aires

Abstract The PIXE technique, using heavy ions beams, has been implemented at the TANDAR tandem facility in Buenos Aires. Mainly 16O beams in the bombarding energy range E = 30−50 MeV have been used and a systematic measurement of X-ray production cross sections has been performed. The technique has been applied to a variety of subjects, including environmental, biomedical and industrial problems.

PIXE analysis of heavy water from a nuclear power plant

Abstract The PIXE technique, using heavy ion beams, has been applied to the analysis of heavy water samples from the moderator of a power reactor. Different samples have been measured, coming from the moderator itself and from unused heavy water. Both types of samples contain Fe, Cu and Zn in variable concentrations. In those taken from the moderator, Tc and Xe were also detected. The PIXE technique, used with preconcentrated water, leads to a very high sensitivity below the parts-per-billion limit.

High-spin states in sup 166 Lu

High-spin states belonging to {sup 166}Lu have been studied through the {sup 159}Tb({sup 12}C,5{ital n}) fusion-evaporation reaction in the energy range {ital E}({sup 12}C)=75--90 MeV. In-beam and activity singles spectra and {gamma}-{gamma}-{ital t} coincidences have been measured. A completely new level scheme is proposed. Each rotational band is interpreted on the basis of coupling scheme systematics. {ital g}-{ital S} crossing frequencies and alignments have been extracted. {ital B}({ital M}1)/{ital B}({ital E}2) reduced transition probability ratios have been calculated using a semiclassical method and compared to the experimental values.