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Browsing by Author "A. Ionescu"

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    Study of octupole correlations in 90Zr and 91Zr isotopes
    (PHYSICAL REVIEW C, 2024-12-13) Iskra, Łukasz; Marginean, R.; Bottoni, S.; N. Marginean; Fornal, Bogdan; Leoni, S.; G. Colo; L. Stan; R. Borcea; M. Boromiza; S. C˘alinescu; Cieplicka-Oryńczak, N.; C. Clisu-Stan; C. Costache; F.C.L. Crespi; D. Filipescu; N. Florea; I. Gheorghe; A. Ionescu; R. Lica; C. Mihai; R.E. Mihai; C.R. Nita; S. Pascu; C. Petrone; S. Toma; A. Turturica; S. Ujeniuc
    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.