Fast decay of a three-quasiparticle isomer in Tm171

P. M. Walker; R. J. Wood; G. D. Dracoulis; T. Kibédi; R. A. Bark; A. M. Bruce; A. P. Byrne; P. M. Davidson; H. M. El-Masri; G. J. Lane; C. Moon; J. N. Orce; F. M.Prados Estevéz; C. Wheldon; A. N. Wilson

doi:10.1103/PhysRevC.79.044321

Fast decay of a three-quasiparticle isomer in Tm171

P. M. Walker, R. J. Wood, G. D. Dracoulis, T. Kibédi, R. A. Bark, A. M. Bruce, A. P. Byrne, P. M. Davidson, H. M. El-Masri, G. J. Lane, C. Moon, J. N. Orce, F. M.Prados Estevéz, C. Wheldon, A. N. Wilson

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Abstract

Incomplete-fusion reactions have been used to study high-spin states in Tm171. Gamma rays and conversion electrons were measured using pulsed-beam conditions for enhanced isomer sensitivity. A Kπ=19/2+, three-quasiparticle isomer was identified, with a half-life of 1.7(2) μs. The faster than expected transition rates from the isomer can be understood as being due to a chance near-degeneracy, with mixing between the isomeric state and the Iπ=19/2+ member of the one-quasiparticle rotational band to which it decays. The implied mixing matrix element is 12(2) eV.

Original language	English
Article number	044321
Journal	Physical Review C - Nuclear Physics
Volume	79
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.79.044321
Publication status	Published - 1 Apr 2009

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Walker, P. M., Wood, R. J., Dracoulis, G. D., Kibédi, T., Bark, R. A., Bruce, A. M., Byrne, A. P., Davidson, P. M., El-Masri, H. M., Lane, G. J., Moon, C., Orce, J. N., Estevéz, F. M. P., Wheldon, C., & Wilson, A. N. (2009). Fast decay of a three-quasiparticle isomer in Tm171. Physical Review C - Nuclear Physics, 79(4), Article 044321. https://doi.org/10.1103/PhysRevC.79.044321

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abstract = "Incomplete-fusion reactions have been used to study high-spin states in Tm171. Gamma rays and conversion electrons were measured using pulsed-beam conditions for enhanced isomer sensitivity. A Kπ=19/2+, three-quasiparticle isomer was identified, with a half-life of 1.7(2) μs. The faster than expected transition rates from the isomer can be understood as being due to a chance near-degeneracy, with mixing between the isomeric state and the Iπ=19/2+ member of the one-quasiparticle rotational band to which it decays. The implied mixing matrix element is 12(2) eV.",

author = "Walker, {P. M.} and Wood, {R. J.} and Dracoulis, {G. D.} and T. Kib{\'e}di and Bark, {R. A.} and Bruce, {A. M.} and Byrne, {A. P.} and Davidson, {P. M.} and El-Masri, {H. M.} and Lane, {G. J.} and C. Moon and Orce, {J. N.} and Estev{\'e}z, {F. M.Prados} and C. Wheldon and Wilson, {A. N.}",

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AU - Walker, P. M.

AU - Wood, R. J.

AU - Dracoulis, G. D.

AU - Kibédi, T.

AU - Bark, R. A.

AU - Bruce, A. M.

AU - Byrne, A. P.

AU - Davidson, P. M.

AU - El-Masri, H. M.

AU - Lane, G. J.

AU - Moon, C.

AU - Orce, J. N.

AU - Estevéz, F. M.Prados

AU - Wheldon, C.

AU - Wilson, A. N.

PY - 2009/4/1

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N2 - Incomplete-fusion reactions have been used to study high-spin states in Tm171. Gamma rays and conversion electrons were measured using pulsed-beam conditions for enhanced isomer sensitivity. A Kπ=19/2+, three-quasiparticle isomer was identified, with a half-life of 1.7(2) μs. The faster than expected transition rates from the isomer can be understood as being due to a chance near-degeneracy, with mixing between the isomeric state and the Iπ=19/2+ member of the one-quasiparticle rotational band to which it decays. The implied mixing matrix element is 12(2) eV.

AB - Incomplete-fusion reactions have been used to study high-spin states in Tm171. Gamma rays and conversion electrons were measured using pulsed-beam conditions for enhanced isomer sensitivity. A Kπ=19/2+, three-quasiparticle isomer was identified, with a half-life of 1.7(2) μs. The faster than expected transition rates from the isomer can be understood as being due to a chance near-degeneracy, with mixing between the isomeric state and the Iπ=19/2+ member of the one-quasiparticle rotational band to which it decays. The implied mixing matrix element is 12(2) eV.

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U2 - 10.1103/PhysRevC.79.044321

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JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 4

M1 - 044321

ER -

Fast decay of a three-quasiparticle isomer in Tm171

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