Two-quasiparticle isomer, E1 hindrances and residual interactions in Tm172

R. O. Hughes; G. J. Lane; G. D. Dracoulis; T. Kibédi; P. Nieminen; H. Watanabe

doi:10.1103/PhysRevC.77.044309

Two-quasiparticle isomer, E1 hindrances and residual interactions in Tm172

R. O. Hughes, G. J. Lane, G. D. Dracoulis, T. Kibédi, P. Nieminen, H. Watanabe

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Abstract

The structure of the neutron-rich nucleus Tm172 has been studied using incomplete fusion of Li7 on an Er170 target at 30 MeV. A 190-μs isomer at an excitation energy of 476 keV was identified using chopped beams and γ-ray spectroscopy. The isomer decays with very inhibited E1 transitions to the rotational bands based on the parallel and antiparallel couplings of the ν5/2-[512]π1/2+[411] configuration, the latter (Kπ=2-) being the ground state. The isomeric state has been assigned Jπ=6+, arising from the energetically favored (parallel) coupling of the ν5/2-[512]π7/2-[523] configuration. The proton-neutron residual interaction was deduced for the configuration of the isomeric state and is found to agree with previous empirical studies.

Original language	English
Article number	044309
Journal	Physical Review C - Nuclear Physics
Volume	77
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.77.044309
Publication status	Published - 14 Apr 2008

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abstract = "The structure of the neutron-rich nucleus Tm172 has been studied using incomplete fusion of Li7 on an Er170 target at 30 MeV. A 190-μs isomer at an excitation energy of 476 keV was identified using chopped beams and γ-ray spectroscopy. The isomer decays with very inhibited E1 transitions to the rotational bands based on the parallel and antiparallel couplings of the ν5/2-[512]π1/2+[411] configuration, the latter (Kπ=2-) being the ground state. The isomeric state has been assigned Jπ=6+, arising from the energetically favored (parallel) coupling of the ν5/2-[512]π7/2-[523] configuration. The proton-neutron residual interaction was deduced for the configuration of the isomeric state and is found to agree with previous empirical studies.",

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AU - Hughes, R. O.

AU - Lane, G. J.

AU - Dracoulis, G. D.

AU - Kibédi, T.

AU - Nieminen, P.

AU - Watanabe, H.

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N2 - The structure of the neutron-rich nucleus Tm172 has been studied using incomplete fusion of Li7 on an Er170 target at 30 MeV. A 190-μs isomer at an excitation energy of 476 keV was identified using chopped beams and γ-ray spectroscopy. The isomer decays with very inhibited E1 transitions to the rotational bands based on the parallel and antiparallel couplings of the ν5/2-[512]π1/2+[411] configuration, the latter (Kπ=2-) being the ground state. The isomeric state has been assigned Jπ=6+, arising from the energetically favored (parallel) coupling of the ν5/2-[512]π7/2-[523] configuration. The proton-neutron residual interaction was deduced for the configuration of the isomeric state and is found to agree with previous empirical studies.

AB - The structure of the neutron-rich nucleus Tm172 has been studied using incomplete fusion of Li7 on an Er170 target at 30 MeV. A 190-μs isomer at an excitation energy of 476 keV was identified using chopped beams and γ-ray spectroscopy. The isomer decays with very inhibited E1 transitions to the rotational bands based on the parallel and antiparallel couplings of the ν5/2-[512]π1/2+[411] configuration, the latter (Kπ=2-) being the ground state. The isomeric state has been assigned Jπ=6+, arising from the energetically favored (parallel) coupling of the ν5/2-[512]π7/2-[523] configuration. The proton-neutron residual interaction was deduced for the configuration of the isomeric state and is found to agree with previous empirical studies.

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Two-quasiparticle isomer, E1 hindrances and residual interactions in Tm172

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