First observation of negative-parity high-spin states in 134Cs and possible boundary of chirality in odd-odd Cs isotopes
Negative-parity high-spin states in neutron-rich cesium isotope 134Cs are reported for the first time using the reaction 130Te(7Li, 3n)134Cs. The previously known level scheme of 134Cs is considerably extended with the addition of more than 50 new γ transitions. Two negative-parity bands are observe...
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
|
| Series: | Physics Letters B |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S037026932500471X |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Negative-parity high-spin states in neutron-rich cesium isotope 134Cs are reported for the first time using the reaction 130Te(7Li, 3n)134Cs. The previously known level scheme of 134Cs is considerably extended with the addition of more than 50 new γ transitions. Two negative-parity bands are observed and proposed as pseudospin partner bands with π(g7/2,d5/2)⊗νh11/2 configurations, supported by particle rotor model calculations. A pair of nearly degenerate positive-parity bands based on πh11/2⊗νh11/2 configuration are identified and interpreted as chiral doublet bands in 134Cs, which is the first chiral neutron-rich nucleus in the A≈130 mass region. Meanwhile, 134Cs is also currently the heaviest nucleus with chirality among Cs isotopes, meaning that it may be the boundary of the chiral nuclei in the odd-odd Cs isotopes while approaching N = 82. In addition, the electric dipole transitions linking the positive- and negative-parity bands are observed, suggesting the possible presence of octupole correlations in 134Cs. |
|---|---|
| ISSN: | 0370-2693 |