Structure changes in {sup 160}Er from low to ultrahigh spin

Journal Article · Fri Apr 15 00:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.044309· OSTI ID:21499560

Ollier, J; Simpson, J ^[1]; Riley, M A; Wang, X; Aguilar, A; Teal, C ^[2]; Paul, E S; Nolan, P J; Petri, M; Rees, J M; Rigby, S V; Thomson, J; Unsworth, C ^[3]; Carpenter, M P; Janssens, R.V. F.; Kondev, F G; Lauritsen, T; Zhu, S ^[4]; Darby, I G ^[5]; Hartley, D J ^[6]

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1. STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD (United Kingdom)
2. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
3. Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE (United Kingdom)
4. Nuclear Engineering Division and Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
5. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States)
6. Department of Physics, US Naval Academy, Annapolis, Maryland 21402 (United States)

A spectroscopic investigation of the {gamma} decays from excited states in {sup 160}Er has been performed in order to study the changing structural properties exhibited from low spin up toward ultrahigh spin (I{approx}60({h_bar}/2{pi})). The nucleus {sup 160}Er was populated by the reaction {sup 116}Cd({sup 48}Ca,4n{gamma}) at a beam energy of 215 MeV, and resulting {gamma} decays were studied using the Gammasphere spectrometer. New rotational structures and extensions to existing bands were observed, revealing a diverse range of quasiparticle configurations, which are discussed in terms of the cranked shell model. At spins around 50({h_bar}/2{pi}) there is evidence for oblate states close to the yrast line. Three rotational bands that have the characteristics of strongly deformed triaxial structures are observed, marking a return to collectivity at even higher spin. The high-spin data are interpreted within the framework of cranked Nilsson-Strutinsky calculations.

• OSTI ID: 21499560
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 4; Other Information: DOI: 10.1103/PhysRevC.83.044309; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CADMIUM 116 TARGET
CALCIUM 48 REACTIONS
ERBIUM 160
EXCITED STATES
GAMMA DECAY
GAMMA SPECTROSCOPY
HIGH SPIN STATES
MEV RANGE 100-1000
NEUTRON EMISSION
NUCLEAR STRUCTURE
ROTATIONAL STATES
SHELL MODELS
SPIN
YRAST STATES
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
DAYS LIVING RADIOISOTOPES
DECAY
ELECTRON CAPTURE RADIOISOTOPES
EMISSION
ENERGY LEVELS
ENERGY RANGE
ERBIUM ISOTOPES
EVEN-EVEN NUCLEI
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
NUCLEAR DECAY
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
PARTICLE PROPERTIES
RADIOISOTOPES
RARE EARTH NUCLEI
SPECTROSCOPY
TARGETS