Electromagnetic properties of excited states in the even-even erbium isotopes from Coulomb excitation studies
The reorientation effect in Coulomb excitation has been used to measure in the static quadrupole moments Q+' of 2/sup +prime/ ..gamma..-vibrational states; and the branching ratio B/sub ..gamma../ for the decay of the 2/sup +prime/ state to the 0/sup +/ ground state and the first 2/sup +/ state. Both particle-..gamma.. coincidence and particle spectroscopy experiments were carried out to extract these quantities, using 12.5 MeV ..cap alpha.. and 48 MeV /sup 16/O beams with enriched targets. The evaluation was based on the semiclassical Winther-deBoer code and corrected for quantum mechanical effects. The measured values of Q+' agree well with the predictions of the rotation-vibration model, asymmetric rotor model, and, for /sup 168/Er, the interacting boson approximation. For B/sub ..gamma../, all of the above models predict the increasing trend with increasing mass number seen in the measurements, but are unable to correctly predict the absolute magnitudes.
- Research Organization:
- Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
- OSTI ID:
- 6235732
- Journal Information:
- Phys. Rev. C; (United States), Vol. 27:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALPHA REACTIONS
INELASTIC SCATTERING
ERBIUM ISOTOPES
ENERGY LEVELS
OXYGEN 16 REACTIONS
BRANCHING RATIO
COINCIDENCE SPECTROMETRY
COULOMB FIELD
COUPLED CHANNEL THEORY
CROSS SECTIONS
EVEN-EVEN NUCLEI
GAMMA RADIATION
INTERACTING BOSON MODEL
MEV RANGE 10-100
PARITY
QUANTUM MECHANICS
ROTATIONAL STATES
SPIN
ANGULAR MOMENTUM
CHARGED-PARTICLE REACTIONS
ELECTRIC FIELDS
ELECTROMAGNETIC RADIATION
ENERGY RANGE
EXCITED STATES
HEAVY ION REACTIONS
IONIZING RADIATIONS
ISOTOPES
MATHEMATICAL MODELS
MECHANICS
MEV RANGE
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
PARTICLE PROPERTIES
RADIATIONS
RARE EARTH ISOTOPES
SCATTERING
SHELL MODELS
651515* - Nuclear Properties & Reactions
A=39-58
Theoretical- Nuclear Reactions & Scattering- (-1987)