Beyond band termination in Er-157 and the search for wobbling excitations in strongly deformed Hf-174

M A Riley, M K Djongolov, A O Evans, D J Hartley, R V F Janssens, E S Paul, J Simpson, A A Aguilar, D E Appelbe, C R Bingham, D B Campbell, M P Carpenter, P Chowdhury, P T W Choy, R M Clark, M Cromaz, D M Cullen, M Danchev, G D Dracoulis, P FallonA Gorgen, G B Hagemann, D T Joss, J Goon, R A Kaye, T L Khoo, F G Kondev, R W Laird, K Lagergren, T Lauritsen, A O Macchiavelli, B McClain, E F Moore, G Mukherjee, E Ngijoi-Yogo, P J Nolan, H I Park, A Pipidis, L L Riedinger, G Sletten, S K Tandel, P M Walker, D Ward, I Ragnarsson, F Saric, J Y Zhang

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    High-spin terminating bands in heavy nuclei were first identified in nuclei around Er-158(90). While examples of special terminating states have been identified in a number of erbium isotopes, almost nothing is known about the states lying beyond band termination. In the present work the high-spin structure of Er-157 has been studied using the Gammasphere spectrometer. The subject of triaxial superdeformation and 'wobbling' modes in Lu nuclei has rightly attracted a great deal of attention. Very recently, four strongly or superdeformed (SD) sequences have been observed in Hf-174 and ultimate cranker calculations predict, such structures may have significant triaxial deformation. We have performed two experiments in an attempt to verify the possible triaxial nature of these bands. A lifetime measurement was performed to confirm the large (and similar) deformation of the bands. In addition, a high-statistics, thin-target experiment was run to search for linking transitions between the SD bands and possible wobbling modes.
    Original languageEnglish
    Title of host publicationhost publication
    PublisherIOP Publishing Ltd
    Publication statusPublished - 2005
    Event1st International Conference on Nuclear, Structure, Astrophysics and Reactions (NUSTAR 05) - Guildford, ENGLAND
    Duration: 1 Jan 1824 → …
    http://<Go to ISI>://000232575600017

    Conference

    Conference1st International Conference on Nuclear, Structure, Astrophysics and Reactions (NUSTAR 05)
    CityGuildford, ENGLAND
    Period1/01/24 → …
    Internet address

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