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Low-energy coexisting band in 154Gd
W D Kulp1, J L Wood, K S Krane
1School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA.
Physical Review Letters
|October 4, 2003
Summary
A low-energy nuclear structure, a "pairing isomer," was identified in the deformed nucleus 154Gd. This structure arises from specific nuclear interactions and unique orbital configurations.
Area of Science:
- Nuclear Physics
- Atomic and Molecular Physics
- Condensed Matter Physics
Background:
- Nuclear structure studies investigate the arrangement of protons and neutrons within atomic nuclei.
- Deformed nuclei exhibit non-spherical shapes, leading to complex energy level structures.
Purpose of the Study:
- To identify and characterize a low-energy coexisting band in the deformed nucleus 154Gd.
- To explain the observed nuclear structure in terms of fundamental nuclear properties.
Main Methods:
- Detailed gamma-ray spectroscopy was employed.
- The study analyzed beta decays from 154Eu and 154Tb isotopes.
Main Results:
- A coexisting band with spin-parity assignments 0+, 2+, and 4+ was identified at low energies (1182, 1418, 1701 keV).
- The observed nuclear structure was successfully explained by considering pairing and deformation degrees of freedom.
- The structure is attributed to a "pairing isomer" originating from the nu[505] upward arrow Nilsson intruder orbital.
Conclusions:
- The identified low-energy band in 154Gd represents a "pairing isomer."
- This phenomenon is linked to the interplay of pairing correlations and nuclear deformation.
- The nu[505] upward arrow Nilsson orbital plays a crucial role in forming this isomeric state.