Ultrahigh-spin spectroscopy of {sup 159,160}Er: Observation of triaxial strongly deformed structures

Journal Article · Tue Dec 15 04:00:00 EST 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.064322· OSTI ID:21296587

Ollier, J; Simpson, J; Wang, X; Riley, M A; Aguilar, A; Teal, C; Paul, E S; Nolan, P J; Petri, M; Rigby, S V; Thomson, J; Unsworth, C; Carpenter, M P; Janssens, R V. F.; Kondev, F G; Lauritsen, T; Zhu, S; Hartley, D J; Darby, I G; Ragnarsson, I ^[1]

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1. 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, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 80; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BEAMS
CADMIUM 116 TARGET
CALCIUM 48
DEFORMED NUCLEI
ERBIUM 159
ERBIUM 160
EVAPORATION
GAMMA DECAY
HEAVY ION FUSION REACTIONS
HIGH SPIN STATES
MEV RANGE 100-1000
ROTATIONAL STATES
SPECTROMETERS
SPECTROSCOPY
SPIN
THULIUM ISOTOPES
YTTERBIUM ISOTOPES