Two-quasiparticle configurations, signature inversion, and the πi13/2⊗ νi13/2 band in 176Ir

R. A. Bark; A. M. Baxter; A. P. Byrne; P. M. Davidson; G. D. Dracoulis; S. M. Mullins; T. R. McGoram; R. T. Newman

doi:10.1103/PhysRevC.67.014320

Two-quasiparticle configurations, signature inversion, and the πi_13/2⊗ νi_13/2 band in ¹⁷⁶Ir

R. A. Bark^*, A. M. Baxter, A. P. Byrne, P. M. Davidson, G. D. Dracoulis, S. M. Mullins, T. R. McGoram, R. T. Newman

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

High-spin states have been populated in ¹⁷⁶Ir using the ¹⁴⁹Sm(³¹P,4n) reaction. Gamma-gamma coincidence techniques have allowed numerous bands up to a maximum spin of 32 to be identified. Configurations have been assigned based on spectroscopic properties such as B(M1)/B(E2) values and aligned angular momenta. Signature inversions are observed in bands based on the πh_9/2⊗ vi_13/2 and πi_13/2⊗ vi_13/2 configurations. These inversions are compared with particle-rotor model calculations and are qualitatively reproduced when a residual proton-neutron interaction is included. The shape evolution of the bands has been studied using diabatic potential energy surface calculations. A strong configuration dependence is predicted.

Original language	English
Article number	014320
Pages (from-to)	143201-1432014
Number of pages	1288814
Journal	Physical Review C - Nuclear Physics
Volume	67
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.67.014320
Publication status	Published - 1 Jan 2003

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title = "Two-quasiparticle configurations, signature inversion, and the πi13/2⊗ νi13/2 band in 176Ir",

abstract = "High-spin states have been populated in 176Ir using the 149Sm(31P,4n) reaction. Gamma-gamma coincidence techniques have allowed numerous bands up to a maximum spin of 32 to be identified. Configurations have been assigned based on spectroscopic properties such as B(M1)/B(E2) values and aligned angular momenta. Signature inversions are observed in bands based on the πh9/2⊗ vi13/2 and πi13/2⊗ vi13/2 configurations. These inversions are compared with particle-rotor model calculations and are qualitatively reproduced when a residual proton-neutron interaction is included. The shape evolution of the bands has been studied using diabatic potential energy surface calculations. A strong configuration dependence is predicted.",

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AU - Bark, R. A.

AU - Baxter, A. M.

AU - Byrne, A. P.

AU - Davidson, P. M.

AU - Dracoulis, G. D.

AU - Mullins, S. M.

AU - McGoram, T. R.

AU - Newman, R. T.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - High-spin states have been populated in 176Ir using the 149Sm(31P,4n) reaction. Gamma-gamma coincidence techniques have allowed numerous bands up to a maximum spin of 32 to be identified. Configurations have been assigned based on spectroscopic properties such as B(M1)/B(E2) values and aligned angular momenta. Signature inversions are observed in bands based on the πh9/2⊗ vi13/2 and πi13/2⊗ vi13/2 configurations. These inversions are compared with particle-rotor model calculations and are qualitatively reproduced when a residual proton-neutron interaction is included. The shape evolution of the bands has been studied using diabatic potential energy surface calculations. A strong configuration dependence is predicted.

AB - High-spin states have been populated in 176Ir using the 149Sm(31P,4n) reaction. Gamma-gamma coincidence techniques have allowed numerous bands up to a maximum spin of 32 to be identified. Configurations have been assigned based on spectroscopic properties such as B(M1)/B(E2) values and aligned angular momenta. Signature inversions are observed in bands based on the πh9/2⊗ vi13/2 and πi13/2⊗ vi13/2 configurations. These inversions are compared with particle-rotor model calculations and are qualitatively reproduced when a residual proton-neutron interaction is included. The shape evolution of the bands has been studied using diabatic potential energy surface calculations. A strong configuration dependence is predicted.

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Two-quasiparticle configurations, signature inversion, and the πi_13/2⊗ νi_13/2 band in ¹⁷⁶Ir

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