Resolution of the isomer179 anomaly: Exposure of a Fermi-aligned s band

P. M. Walker; G. D. Dracoulis; A. P. Byrne; B. Fabricius; T. Kibédi; A. E. Stuchbery

doi:10.1103/PhysRevLett.67.433

Resolution of the isomer179 anomaly: Exposure of a Fermi-aligned s band

P. M. Walker^*, G. D. Dracoulis, A. P. Byrne, B. Fabricius, T. Kibédi, A. E. Stuchbery

^*Corresponding author for this work

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

52 Citations (Scopus)

Abstract

The K=35/2-, five-quasiparticle isomer in W179 is shown to decay into the region of a backbend in the 7/2-[514] band, allowing for the first time the identification of a full set of aligned-band states. Destructive interference results from level mixing in the band-crossing region. The deduced -ray branching ratios are used to establish the mixing matrix elements and to show that the aligned band has a high value of the K quantum number. The properties of well-defined alignment and yet also high K provide the first clear example of a Fermi-aligned s band. The anomalous decay of the isomer itself is now explained.

Original language	English
Pages (from-to)	433-436
Number of pages	4
Journal	Physical Review Letters
Volume	67
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.67.433
Publication status	Published - 22 Jul 1991

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title = "Resolution of the isomer179 anomaly: Exposure of a Fermi-aligned s band",

abstract = "The K=35/2-, five-quasiparticle isomer in W179 is shown to decay into the region of a backbend in the 7/2-[514] band, allowing for the first time the identification of a full set of aligned-band states. Destructive interference results from level mixing in the band-crossing region. The deduced -ray branching ratios are used to establish the mixing matrix elements and to show that the aligned band has a high value of the K quantum number. The properties of well-defined alignment and yet also high K provide the first clear example of a Fermi-aligned s band. The anomalous decay of the isomer itself is now explained.",

author = "Walker, {P. M.} and Dracoulis, {G. D.} and Byrne, {A. P.} and B. Fabricius and T. Kib{\'e}di and Stuchbery, {A. E.}",

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AU - Dracoulis, G. D.

AU - Byrne, A. P.

AU - Fabricius, B.

AU - Kibédi, T.

AU - Stuchbery, A. E.

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AB - The K=35/2-, five-quasiparticle isomer in W179 is shown to decay into the region of a backbend in the 7/2-[514] band, allowing for the first time the identification of a full set of aligned-band states. Destructive interference results from level mixing in the band-crossing region. The deduced -ray branching ratios are used to establish the mixing matrix elements and to show that the aligned band has a high value of the K quantum number. The properties of well-defined alignment and yet also high K provide the first clear example of a Fermi-aligned s band. The anomalous decay of the isomer itself is now explained.

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Resolution of the isomer179 anomaly: Exposure of a Fermi-aligned s band

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