Study of octupole correlations in 90Zr and 91Zr isotopes
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DOI
Date
2024-12-13
Authors
Iskra, Łukasz
Marginean, R.
Bottoni, S.
N. Marginean
Fornal, Bogdan
Leoni, S.
G. Colo
L. Stan
R. Borcea
M. Boromiza
Journal Title
Journal ISSN
Volume Title
Publisher
PHYSICAL REVIEW C
License Type
Creative commons license
Abstract
The B(E3) transition strengths in 90Zr and 91Zr isotopes were determined based on the half-life measurements of the first 3− and (11/2)− states, i.e., T1/2 = 7.8(16) ps and 500(16) ps, respectively. The plunger method and fast-timing techniques were employed. The B(E3) values of 16(3) and 20.5(7) W.u. for 90Zr and 91Zr were derived, pointing to a sizable octupole collectivity in both cases. The 90Zr value complements the systematics of the octupole strength in even-even Zr isotopic chain, revealing a smooth trend between A = 90 and 96, which is in agreement with the pattern of octupole strength predicted by quasiparticle random phase approximation calculations. In 91Zr, the hybrid configuration mixing model describes the (11/2)− low-energy strength in terms of a coupling of the unpaired neutron with the 3− octupole excitation of the 90Zr core, predicting a slight decrease of octupole strength which is in contrast with the experimental result. This suggests a more complex structure for the (11/2)− state in 91Zr than predicted by the weak-coupling limit.
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Citation
PHYSICAL REVIEW C 110, 064312 (2024)
Sponsorship:
This work was supported by the Polish National Science Centre, Poland, under Research Projects No. 2020/39/D/ST2/03510, the Romanian MCID Nucleu Program No. PN 23 21 01 02, and the Italian Istituto Nazionale di Fisica Nucleare.
Grantnumber:
No. 2020/39/D/ST2/03510
License Type
Attribution 4.0 International