Journal article
High-spin properties of Er164 in the multiple band crossing region
Physical review. C, Nuclear physics, Vol.21(6), pp.2366-2384
06/1980
DOI: 10.1103/PhysRevC.21.2366
Abstract
High-spin states in 164Er have been studied by using the 150Nd(18 O,4n ) and 164Dy(α,4ny) reactions and by multiple Coulomb excitation with 136Xe ions. Several positive-parity bands are excited, and two negative-parity bands have been identified. The previously reported backbending behavior of the yrast sequence is demonstrated to result from the intersection of the ground band (seen to spin 22+) with an even-spin "superband" observed from spins 12+ to 24+. The odd-spin yrast superband and the second lowest even-spin superband also have been observed. All the superbands have moments of inertia appreciably larger than the ground band. The observed intersection of these multiple superbands with the y band produces different backbending behavior and a staggering of the energies of the odd- and even-spin members of the y band. B(E2) values for transitions below and through the band intersection regions of both the ground band and y bands have been deduced from multiple Coulomb excitation yields. In addition, lifetimes have been measured for the ground band by the Doppler-broadened line-shape technique. The level energies and B(E2) values are consistent with weak interaction matrix elements (-45 keV) between the intersecting bands. The B(E2) values of the unperturbed band are found to obey the simple rigid-rotor relationship. The 7-- negative-parity band exhibits a normal rotational sequence, while the 5 -- band exhibits a large odd-even staggering and a larger moment of inertia. Two-quasiparticle-plus-rotor model calculations indicate strong rotation-alignment and reproduce the observed properties of the high-spin states for both the positive- and negative-parity bands in 164Er.
Details
- Title: Subtitle
- High-spin properties of Er164 in the multiple band crossing region
- Creators
- S. W YatesI. Y LeeN. R JohnsonE EichlerL. L RiedingerM. W GuidryA. C KahlerD ClineR. S SimonP. A ButlerP ColombaniF. S StephensR. M DiamondR. M RonningenR. D HichwaJ. H HamiltonE. L Robinson
- Resource Type
- Journal article
- Publication Details
- Physical review. C, Nuclear physics, Vol.21(6), pp.2366-2384
- DOI
- 10.1103/PhysRevC.21.2366
- NLM abbreviation
- Phys Rev C Nucl Phys
- ISSN
- 0556-2813
- eISSN
- 1089-490X
- Publisher
- American Physical Society
- Language
- English
- Date published
- 06/1980
- Academic Unit
- Radiology; Research Administration; Physics and Astronomy; Radiation Oncology
- Record Identifier
- 9984213292102771
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