Investigation of quadrupole interactions in single crystals with the perturbed angular correlation method

Time-integral perturbed angular correlation measurements after Coulomb excitation for transitions from the first rotational levels in sup(152, 154)Sm, sup(182, 184, 186)W and sup(180, 190, 192)Os isotopes are presented. The Coulomb excitation process was used to implant the excited nuclei in Zn, Cd, Te and Gd single crystals of hexagonal structure. A strong dependence of the angular correlation function on the single crystal orientation for all combinations of target and single crystals caused by electric quadrupole interaction has been confirmed. The quadrupole interaction frequency ω0 values the quadrupole moments ratio for samarium, tungsten and osmium isotopes were determined. Using the quadrupole moments derived from B(E2) values, the effective electric field gradients acting on samarium, tungsten and osmium nuclei implanted into zinc, cadmium, tellurium and gadolinium single crystals have been evaluated. It has been confirmed that the electronic component of the electric field gradient has the main influence on the effective electric field gradient. Perturbed β-γ angular correlation for transition from the 81 keV level in 133Cs, populated by the β decay of 133Xe implanted after the nuclear reaction into tellurium single crystals, is presented. The sign and the minimum value of the quadrupole moment for the 81 keV level in 133Cs has been determined. (author)