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Observation of states beyond band termination in 156, 157, 158Er and strongly deformed structures in 173, 174, 175Hf

M A Riley1, M K Djongolov2, A O Evans3, D J Hartley4, R V F Janssens5, E S Paul3, A Pipidis1, 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 Kondev5,13, 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, L L Riedinger2, G Sletten11, S K Tandel7, P M Walker15, D Ward8, I Ragnarsson16, F Sarić16 and Jing-ye Zhang2

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High-spin terminating bands in heavy nuclei were first identified in nuclei around 158Er90. While examples of 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 156, 157, 158Er 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 cranking calculations using the Ultimate Cranker code predict that 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 took place to search for linking transitions between the SD bands, possible wobbling modes, and new SD band structures.


PACS

21.60.Ev Collective models

21.10.Re Collective levels

27.70.+q 150(less-than-or-equal-to)A(less-than-or-equal-to)189

23.20.Lv gamma transitions and level energies

21.10.Ma Level density

Subjects

Nuclear physics

Dates

Issue T125 (July 2006)

Received 9 August 2005, accepted for publication 1 September 2005

Published 28 June 2006



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