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Chiral doublet structures in odd-odd n = 75 isotones: chiral vibrations
K Starosta1, T Koike, C J Chiara
1Department of Physics and Astronomy, SUNY at Stony Brook, New York 11794, USA.
Physical Review Letters
|February 15, 2001
Summary
New doublet bands in 134Pr isotones were discovered, suggesting spontaneous chiral symmetry breaking. These findings point to collective chiral vibrations in nuclear structures.
Area of Science:
- Nuclear Physics
- Atomic Physics
Background:
- Yrast bands are fundamental to understanding nuclear structure.
- The pi(h11/2)nu(h11/2) configuration is key in certain heavy isotopes.
- Chirality in atomic nuclei is an area of active research.
Purpose of the Study:
- To identify new sideband partners of yrast bands in N = 75 isotones.
- To investigate the underlying nuclear structure and symmetry in 134Pr.
- To explore the phenomenon of spontaneous chiral symmetry breaking.
Main Methods:
- Experimental identification of nuclear bands in 55Cs, 57La, and 61Pm.
- Theoretical analysis using 3D tilted axis cranking calculations.
- Characterization of triaxial shapes and angular momentum interactions.
Main Results:
- Discovery of new yrast band partners in 134Pr isotones.
- Observation of unique doublet-band systematics indicating a common nuclear basis.
- Identification of left- and right-handed chiral systems arising from particle and core angular momenta.
- Evidence for spontaneous chiral symmetry breaking leading to doublet bands.
Conclusions:
- The identified doublet bands in 134Pr isotones are a manifestation of spontaneous chiral symmetry breaking.
- Small energy differences between doublet bands suggest the presence of collective chiral vibrations.
- The findings provide new insights into nuclear chirality and triaxial shapes.