Decay of a Kπ=21/2-, 17-ms isomer in Ta185

G. J. Lane; G. D. Dracoulis; A. P. Byrne; R. O. Hughes; H. Watanabe; F. G. Kondev; C. J. Chiara; M. P. Carpenter; R. V.F. Janssens; T. Lauritsen; C. J. Lister; E. A. McCutchan; D. Seweryniak; S. Zhu; P. Chowdhury; I. Stefanescu

doi:10.1103/PhysRevC.80.024321

Decay of a Kπ=21/2-, 17-ms isomer in Ta185

G. J. Lane, G. D. Dracoulis, A. P. Byrne, R. O. Hughes, H. Watanabe, F. G. Kondev, C. J. Chiara, M. P. Carpenter, R. V.F. Janssens, T. Lauritsen, C. J. Lister, E. A. McCutchan, D. Seweryniak, S. Zhu, P. Chowdhury, I. Stefanescu

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Abstract

High-spin states in the neutron-rich nucleus Ta185, populated in the decay of a long-lived, three-quasiparticle state, have been studied using deep-inelastic reactions with Xe136 ions and a W186 target. The lifetime of the isomer has been measured as 17(2) ms and the spin and parity determined to be Kπ=21/2-, leading to a π7/2+[404]ν3/2-[512]11/2+[615] configuration assignment. The isomer decays into the rotational band built upon the π9/2-[514] intrinsic state via K-forbidden transitions with reduced hindrances of 52 and 71. The π9/2-[514] state is itself an isomer with a lifetime of 17(3) ns. It decays via K-allowed E1 transitions to states in the π7/2+[404] band with strengths that are similar to equivalent transitions in the lighter tantalum isotopes.

Original language	English
Article number	024321
Journal	Physical Review C - Nuclear Physics
Volume	80
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.80.024321
Publication status	Published - 31 Aug 2009

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Lane, G. J., Dracoulis, G. D., Byrne, A. P., Hughes, R. O., Watanabe, H., Kondev, F. G., Chiara, C. J., Carpenter, M. P., Janssens, R. V. F., Lauritsen, T., Lister, C. J., McCutchan, E. A., Seweryniak, D., Zhu, S., Chowdhury, P., & Stefanescu, I. (2009). Decay of a Kπ=21/2-, 17-ms isomer in Ta185. Physical Review C - Nuclear Physics, 80(2), Article 024321. https://doi.org/10.1103/PhysRevC.80.024321

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title = "Decay of a Kπ=21/2-, 17-ms isomer in Ta185",

abstract = "High-spin states in the neutron-rich nucleus Ta185, populated in the decay of a long-lived, three-quasiparticle state, have been studied using deep-inelastic reactions with Xe136 ions and a W186 target. The lifetime of the isomer has been measured as 17(2) ms and the spin and parity determined to be Kπ=21/2-, leading to a π7/2+[404]ν3/2-[512]11/2+[615] configuration assignment. The isomer decays into the rotational band built upon the π9/2-[514] intrinsic state via K-forbidden transitions with reduced hindrances of 52 and 71. The π9/2-[514] state is itself an isomer with a lifetime of 17(3) ns. It decays via K-allowed E1 transitions to states in the π7/2+[404] band with strengths that are similar to equivalent transitions in the lighter tantalum isotopes.",

author = "Lane, {G. J.} and Dracoulis, {G. D.} and Byrne, {A. P.} and Hughes, {R. O.} and H. Watanabe and Kondev, {F. G.} and Chiara, {C. J.} and Carpenter, {M. P.} and Janssens, {R. V.F.} and T. Lauritsen and Lister, {C. J.} and McCutchan, {E. A.} and D. Seweryniak and S. Zhu and P. Chowdhury and I. Stefanescu",

year = "2009",

month = aug,

day = "31",

doi = "10.1103/PhysRevC.80.024321",

language = "English",

volume = "80",

journal = "Physical Review C - Nuclear Physics",

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AU - Lane, G. J.

AU - Dracoulis, G. D.

AU - Byrne, A. P.

AU - Hughes, R. O.

AU - Watanabe, H.

AU - Kondev, F. G.

AU - Chiara, C. J.

AU - Carpenter, M. P.

AU - Janssens, R. V.F.

AU - Lauritsen, T.

AU - Lister, C. J.

AU - McCutchan, E. A.

AU - Seweryniak, D.

AU - Zhu, S.

AU - Chowdhury, P.

AU - Stefanescu, I.

PY - 2009/8/31

Y1 - 2009/8/31

N2 - High-spin states in the neutron-rich nucleus Ta185, populated in the decay of a long-lived, three-quasiparticle state, have been studied using deep-inelastic reactions with Xe136 ions and a W186 target. The lifetime of the isomer has been measured as 17(2) ms and the spin and parity determined to be Kπ=21/2-, leading to a π7/2+[404]ν3/2-[512]11/2+[615] configuration assignment. The isomer decays into the rotational band built upon the π9/2-[514] intrinsic state via K-forbidden transitions with reduced hindrances of 52 and 71. The π9/2-[514] state is itself an isomer with a lifetime of 17(3) ns. It decays via K-allowed E1 transitions to states in the π7/2+[404] band with strengths that are similar to equivalent transitions in the lighter tantalum isotopes.

AB - High-spin states in the neutron-rich nucleus Ta185, populated in the decay of a long-lived, three-quasiparticle state, have been studied using deep-inelastic reactions with Xe136 ions and a W186 target. The lifetime of the isomer has been measured as 17(2) ms and the spin and parity determined to be Kπ=21/2-, leading to a π7/2+[404]ν3/2-[512]11/2+[615] configuration assignment. The isomer decays into the rotational band built upon the π9/2-[514] intrinsic state via K-forbidden transitions with reduced hindrances of 52 and 71. The π9/2-[514] state is itself an isomer with a lifetime of 17(3) ns. It decays via K-allowed E1 transitions to states in the π7/2+[404] band with strengths that are similar to equivalent transitions in the lighter tantalum isotopes.

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Decay of a Kπ=21/2-, 17-ms isomer in Ta185

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