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High-spin structure beyond band termination in 157Er
A O Evans1, E S Paul, J Simpson
1Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom.
Physical Review Letters
|July 13, 2004
Summary
Researchers studied the transition from collective rotation to noncollective configurations in 157Er. They discovered new weakly populated states feeding band termination, suggesting "core-breaking" configurations.
Area of Science:
- Nuclear Physics
- Atomic Physics
Background:
- Collective rotation is a fundamental behavior in atomic nuclei.
- Transitions to noncollective configurations are crucial for understanding nuclear structure evolution.
Purpose of the Study:
- Investigate the angular-momentum induced transition from deformed collective rotation to noncollective configurations in 157Er.
- Characterize the feeding of band terminating states near I=45 Planck's.
- Identify the nature of newly discovered high-excitation energy states.
Main Methods:
- Utilized the Gammasphere spectrometer for high-resolution gamma-ray detection.
- Analyzed experimental data to identify weakly populated states and their decay paths.
- Performed Cranked Nilsson-Strutinsky calculations to interpret nuclear configurations.
Main Results:
- Observed the manifestation of the transition as favored band termination near I=45 Planck's in 157Er.
- Discovered numerous weakly populated states at high excitation energy feeding these terminating states.
- Identified these states as arising from weakly collective "core-breaking" configurations.
Conclusions:
- The study provides the first investigation into the feeding of band terminating states in 157Er.
- Weakly collective "core-breaking" configurations are responsible for the observed high-excitation energy states.
- This work sheds light on the evolution of nuclear structure at high angular momentum.