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

doi:10.1088/0954-3899/31/10/064

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

M A Riley et al 2005 J. Phys. G: Nucl. Part. Phys. 31 S1735-S1740 doi: 10.1088/0954-3899/31/10/064

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M A Riley¹, M K Djongolov², A O Evans³, D J Hartley⁴, R V F Janssens⁵, E S Paul³, J Simpson⁶, A A Aguilar¹, D E Appelbe⁶, C R Bingham², D B Campbell¹, M P Carpenter⁵, P Chowdhury⁷, P T W Choy³, R M Clark⁸, M Cromaz⁸, D M Cullen⁹, M Danchev², G D Dracoulis¹⁰, P Fallon⁸, A Görgen⁸, G B Hagemann¹¹, D T Joss⁶, J Goon², R A Kaye¹², T L Khoo⁵, F G Kondev^5,13, R W Laird¹⁴, K Lagergren¹, T Lauritsen⁵, A O Macchiavelli⁸, B McClain¹⁴, E F Moore⁵, G Mukherjee⁷, E Ngijoi-Yogo⁷, P J Nolan³, H I Park², A Pipidis¹, L L Riedinger², G Sletten¹¹, S K Tandel⁷, P M Walker¹⁵, D Ward⁸, I Ragnarsson¹⁶, F Sarić¹⁶ and Jing-ye Zhang²
¹ Department of Physics, Florida State University, Tallahassee, FL 32306, USA
² Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
³ Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, UK
⁴ Department of Physics, US Naval Academy, Annapolis, MD 21402, USA
⁵ Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
⁶ CCLRC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UK
⁷ Department of Physics, University of Massachusetts, Lowell, MA 01854, USA
⁸ Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
⁹ Schuster Laboratory, University of Manchester, Manchester M13 9PL, UK
¹⁰ Department of Nuclear Physics, Australian National University, Canberra, ACT 0200, Australia
¹¹ The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
¹² Department of Chemistry and Physics, Purdue University Calumet, Hammond, IN 46323, USA
¹³ Nuclear Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA
¹⁴ Department of Physics, Trinity University, San Antonio, TX 78212, USA
¹⁵ Department of Physics, University of Surrey, Guildford, Surrey GU2 5XH, UK
¹⁶ Department of Mathematical Physics, Lund Institute of Technology, PO Box 118, S-22100 Lund, Sweden

Abstract. High-spin terminating bands in heavy nuclei were first identified in nuclei around ¹⁵⁸Er₉₀. 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 ¹⁵⁷Er 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 ¹⁷⁴Hf 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.

Print publication: Issue 10 (October 2005)
Received 22 April 2005
Published 12 September 2005

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

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