High-Spin States And Possible Chirality In Odd-Odd Ag-110

Physical Review C(2021)

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摘要
High-spin states of Ag-110 have been studied by in-beam gamma-ray spectroscopic techniques using the fusion-evaporation reaction Pd-110(Li-7, alpha 3n)Ag-110 at a beam energy of 46 MeV. The previously known level scheme of no Ag-110 is significantly extended and modified with the addition of 50 new gamma transitions and 21 new levels. In total, four new rotational bands are observed, among which two negative-parity coupled bands are assigned to the four-quasiparticle pi g(9/2)(-1) circle times vh(11/2) (g7/2/d5/2)(2) configuration based on the quasiparticle alignment analysis and cranked shell model calculations. The properties of both bands show general agreement with the fingerprints of chiral rotation, and thus such two negative-parity bands are suggested to be candidates for near degenerate chiral doublet bands. A new decoupled Delta I = 2 band decaying directly to the yrast band is established, and probably results from one-particle-one-hole (1p-1h) proton excitation from the g(9/)(2) orbital to the g(7/)(2) orbital across the large Z = 50 shell gap, i.e., the 2p2h pi g(9/2)(-2)g(7/)(2) circle times vh(11/2) configuration. In addition to, a weak positive-parity sequence consisting of magnetic dipole (M1) and no E2 crossover transitions is also identified in the present work.
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