Boson symmetries in vibrational nuclei

Phenomenological description of three interacting collective bands

Nuclear Data Sheets for A = 125

Even-A Pd nuclei were studied using the reactions /sup 92/,/sup 94/,/sup 96/Zr(/sup 13/C,3ngamma)/sup 102/,/sup 104/,/sup 106/Pd The experiments included gamma-ray yield as a function of energy, gamma-ray angular distributions, gamma-ray linear polarizations, and gamma-gamma coincidence measurements A new treatment of gamma-gamma directional correlation from oriented nuclei, which combines data from all appropriate coincidence pairs to reduce uncertainties, has aided in determining multipolarities for 49 contaminated transitions Extensive decay schemes are presented which include many high-angular-momentum, positive- and negative-parity states In addition to the ground-state band, there appear to be three collective bands built on excited two-quasiparticle states The measurements favor a slightly deformed rotor description of these nuclei over an interpretation in terms of a vibrational (interacting boson) model (AIP)

Collective and two-quasiparticle excitations in /sup 102/,/sup 104/,/sup 106/Pd following (/sup 13/C,3n. gamma. ) reactions

High-spin states in 172W, 174W and 176W have been studied using gamma -ray techniques following (16O, xn) reactions on enriched Dy targets. The ground-state band has been shown to backbend in 174W and 175W, but not in 172W. Side-bands are populated in each nucleus, with preferential population of an odd-spin sequence in each case. The decay properties of these bands, which have negative parity, suggest that they are due to the partial decoupling of a pair of quasi-particles by the Coriolis force. The properties of the bands are used to estimate in an empirical way the properties of a rotation-aligned (i132/)2 neutron band in order to predict the systematics of backbending due to bandcrossing.

http://iopscience.iop.org/article/10.1088/0305-4616/4/5/008/pdf

High-spin states in 172W, 174W and 176W studied by (16O, xn) reactions: decoupled quasiparticle bands and backbending

Measurements of directional correlation from oriented nuclei (DCO) and the band structure in $sup 102$Pd

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Measurements of directional correlation from oriented nuclei (DCO) and the band structure in $sup 102$Pd