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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
PubMed
Summary
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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.

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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.