Alignment effects in odd-mass Cs isotopes: Spectroscopy of Cs125

J. R. Hughes, D. B. Fossan, D. R. LaFosse, Y. Liang, P. Vaska, M. P. Waring

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Abstract

Several rotational bands have been populated in the Z=55 nucleus Cs125 using the fusion evaporation reaction Pd110(19F,4n), at a beam energy of 74 MeV. The resultant rays were detected using standard -ray spectroscopic techniques with an array of six Compton-suppressed Ge detectors and a fourteen-element bismuth-germanate ball. The low-lying yrast structure is found to be dominated by the unique parity h11/2 orbital, manifest as a decoupled band with a large signature splitting. A crossing occurs in this band at Latin small letter h with strokec=0.42 MeV, which is interpreted as [h11/2]2 pair alignment. In addition, a strongly coupled negative-parity structure with large B(M1)/B(E2) ratios is observed feeding both signatures of the h11/2 band. Bands built on the normal-parity g7/2 and g9/2-1 orbitals have also been confirmed and extended. These structures are compared to cranked-shell-model calculations and the systematics of the region.

Original languageEnglish (US)
Pages (from-to)2390-2399
Number of pages10
JournalPhysical Review C
Volume44
Issue number6
DOIs
StatePublished - Jan 1 1991

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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Hughes, J. R., Fossan, D. B., LaFosse, D. R., Liang, Y., Vaska, P., & Waring, M. P. (1991). Alignment effects in odd-mass Cs isotopes: Spectroscopy of Cs125. Physical Review C, 44(6), 2390-2399. https://doi.org/10.1103/PhysRevC.44.2390