Ultrahigh-spin spectroscopy of {sup 159,160}Er: Observation of triaxial strongly deformed structures
- STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD (United Kingdom)
Three weakly populated high-spin rotational bands associated with the {gamma} decay of {sup 159}Er and {sup 160}Er were observed in fusion-evaporation reactions involving a beam of {sup 48}Ca at an energy of 215 MeV incident on a {sup 116}Cd target. The {gamma} decays were detected using the highly efficient Gammasphere spectrometer. The discovery of these bands, which extend discrete-line spectroscopy in these nuclei to ultrahigh spin of {approx}60({Dirac_h}/2{pi}), is consistent with recent observations of high-spin collective structures in isotopes of Er, Yb, and Tm around N=90. Cranked Nilsson-Strutinsky calculations suggest that these bands may arise from well-deformed triaxial configurations with either positive or negative {gamma} deformation.
- OSTI ID:
- 21296587
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 80, Issue 6; Other Information: DOI: 10.1103/PhysRevC.80.064322; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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