The levels in' "" Ru have been investigated in the spontaneous fission of 2Cf using y-y-y-, y-y-, x-x-,x-y-, and x-y-y-coincidence techniques. The levels up to 16+ and 9+ in the yrast bands and y-vibrational bands have been identified with very little energy staggering in ' "" Ru. The ground bands in ' " Ru have identical y-ray transition energies up to 8+. These are the lightest observed even-even nuclei with extended identical ground bands. Calculations in a collective model which includes rotations and vibrations reproduce the level energies and y band branching ratios above the 3+ state rather we11, while rigid triaxial rotor model calculations reproduce the branching ratios for the 2+ and 3+ states.PACS number(s): 21.10. Re, 23.20.Lv, 21.60.Ev, 27.60.+j
Dynamic deformation theory based on a pairing plus quadrupole model (DPPQ model) is extended to 25 levels belonging to various multi phonon vibrational bands in 15 4 Gd. Although the calculated excited band energies are too high by factors of 1·4-1·7, there is generally reasonable agreement with the experimental energies, B(E2) values, magnetic moments, E2-Ml mixing ratios and EO moments. Many new values are predicted. A brief comparison with some results derived from a new version of dynamic deformation theory, the so-called DNSB model, is also given.
The intensities, placements and E2/M1 mixing ratios of transitions in the decay of ~54Eu have been carefully studied to provide accurate data for microscopic calculations, Coincidence relationships in the decay of 154Eu have been studied extensively with a multiparameter 7-~ coincidence system with two large volume Ge(Li) detectors. Spectra in coincidence with twenty energy gates were analyzed. Twenty-nine new coincidence relationships were established and confirmed most, but not all, of several levels previously assigned by energy fits only. From an analysis of coincidence spectra and singles spectra with a 18% efficiency Ge(Li) detector new information on the gamma-ray intensities were obtained. Precise values of the E2/M1 mixing ratios of transitions from the gamma-and beta-vibrational bands to the g.s. band have been determined from Y-7 directional correlation measurements with a Nal(T1)-Ge(Li) detector coincidence system. Mixing ratios were obtained for a number of other transitions including those from K ~ =0-and 2 + bands from direct and skipped cascade correlations.
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