Competition between rotational and aligned-particle high-spin excitations in /sup 153/ /sup 154/Dy
High-spin level structure of the transitional N = 87,88 /sup 153/ /sup 154/Dy nuclei have been studied using /sup 124/Sn(/sup 34/S,xn) reactions. In both nuclei the lower part of the level scheme includes decoupled rotational bands indicating prolate deformation in yrast structures between I = 17/2 and 41/2 in /sup 153/Dy and up to I = 30 in /sup 154/Dy. Above these collective bands the level structure becomes irregular, very similar to the aligned multiparticle structure in /sup 152/Dy. The yrast 2.3 ns 47/2 isomer at 5591 keV shows that aligned-particle excitations compete successfully with collective rotation above 5 MeV in /sup 153/Dy. The similar change occurs in /sup 154/Dy above 10 MeV after the S-band has crossed with the S'-band. The aligned configurations are connected with the oblate shape of the nucleus and our results show that a transition from a basically prolate to oblate shape occurs in /sup 153/Dy above I = 41/2 and in /sup 154/Dy above I = 32.
- Research Organization:
- Purdue Univ., Lafayette, IN (USA); Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6205401
- Report Number(s):
- CONF-8403127-5; ON: DE85004068
- Resource Relation:
- Conference: 5. Nordic meeting on nuclear physics, Jyvaskyla, Finland, 12 Mar 1984; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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{sup 154}Dy level structure beyond the {open_quotes}terminating state{close_quotes}
Structural changes along and above the yrast line of /sup 154/Dy
Related Subjects
DYSPROSIUM 153
ENERGY LEVELS
DYSPROSIUM 154
EXPERIMENTAL DATA
FUSION REACTIONS
HIGH SPIN STATES
ROTATIONAL STATES
SULFUR 34 REACTIONS
TIN 124 TARGET
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
DATA
DYSPROSIUM ISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
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HEAVY ION REACTIONS
INFORMATION
INTERMEDIATE MASS NUCLEI
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NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
RADIOISOTOPES
RARE EARTH ISOTOPES
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651823* - Nuclear Properties & Reactions
A=150-189
Experimental- Energy Levels & Transitions- (-1987)