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[en] Hyperfine structures and isotope shifts of thulium isotopes in the mass range 157-172 have been measured in the atomic transitions 4f136s2-4f125d6s2 (589.565 nm) and 6s2-6s6p (597.13 nm), using resonance ionization spectroscopy at the IRIS facility. Nuclear magnetic dipole and electric quadrupole moments, and the changes in mean square charge radii have been obtained. They are analysed within the framework of the microscopic-macroscopic approach and the Hartree-Fock method, revealing single-particle and collective properties. Some conclusions on effective nucleon-nucleon interactions are drawn. (orig.)
[en] Excitation functions of the natEr(d, x)163,165,166,167,168,170Tm and natEr(d, x)171Er reactions have been measured experimentally from their respective thresholds up to 40 MeV for the first time. Cross-sections were determined using the activation method and the stacked foil irradiation technique. The theoretical interpretation was done with the ALICE-IPPE code. From the fitted experimental cross-section data integral production yields were calculated and compared to measured integral yield data reported in the literature
[en] Highlights: • Excitation functions of alpha-induced reactions on natEr up to 51 MeV were measured. • Production cross sections of Yb and Tm radioisotopes were determined. • End-of-bombardment activity of 169Yb was deduced. - Abstract: Activation cross sections of alpha-induced reactions on natural erbium were measured using a 50.9-MeV alpha-beam at the RIKEN AVF cyclotron. Well-established methods for the measurements, the stacked-foil activation technique and gamma-ray spectrometry, were used. Production cross sections of 166,169Yb and 165,166,167,168,170,173Tm were determined. This is the first measurement of the cross sections of 166,170Tm. The integral yield of the medical radionuclide 169Yb was derived from the measured excitation function.
[en] The production of 172Tm by the triple capture through the reaction chain of triple neutron capture: 169Tm(n,γ)170Tm(n,γ)171Tm(n,γ)172Tm is informed. The experimental details of irradiations and measurements, as well as the verification of the identity of the radionuclide and the reactions leading to its formation, are described. (author)
[en] The various cross sections of n + 169Tm reaction were calculated. The calculated results show that the activation products 168,167,166,165Tm are important neutron monitor reaction products for n + 169Tm reaction in energy range up to 100 MeV. (3 figs.)