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

Research output: Contribution to journalArticle


High-spin terminating bands in heavy nuclei were first identified in nuclei around Er-158(90). 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 Er-156,Er-157,Er-158 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 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.


  • M. A. Riley
  • M. K. Djongolov
  • A. O. Evans
  • D. J. Hartley
  • R. V. F. Janssens
  • E. S. Paul
  • A. Pipidis
  • 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. Fallon
  • A. 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
  • L. L. Riedinger
  • G. Sletten
  • S. K. Tandel
  • P. M. Walker
  • D. Ward
  • Fikret Saric
  • Jing-ye Zhang
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Sciences
Original languageEnglish
Pages (from-to)123-126
JournalPhysica Scripta
Publication statusPublished - 2006
Publication categoryResearch

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Mathematical Physics (Faculty of Technology) (011040002), Physics, Faculty of Technology (011013200)