Discovery of isomers in dysprosium, holmium, and erbium isotopes with N=94 to 97

T. P.D. Swan*, P. M. Walker, Zs Podolyák, M. W. Reed, G. D. Dracoulis, G. J. Lane, T. Kibédi, M. L. Smith

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    High-spin states in the 68164Er96 region were studied using 9Be + 160Gd reactions. Pulsed beam conditions were exploited for enhanced sensitivity to delayed γ-ray transitions. New isomers were identified in 161Dy, 163Ho, 162Er, and 165Er. The 162Er isomer is interpreted to decay by E1 transitions to the ground-state band with a reduced hindrance of f ν=33. A plot of fν values for all ΔK=7, E1 transitions from two-quasiparticle isomers to the ground-state bands of even-even nuclei reveals only a small influence from the dynamic to kinematic moment-of-inertia ratio, which provides a measure of Coriolis K mixing within the ground-state band. This is interpreted to imply that the relatively low hindrances are due to K mixing in the isomer, caused by a combination of Coriolis and octupole band mixing.

    Original languageEnglish
    Article number024313
    JournalPhysical Review C - Nuclear Physics
    Volume85
    Issue number2
    DOIs
    Publication statusPublished - 21 Feb 2012

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