Discovery of a nonyrast Kπ=8+ isomer in Dy162, and the influence of competing K-mixing mechanisms on its highly forbidden decay

T. P.D. Swan; P. M. Walker; Zs Podolyák; M. W. Reed; G. D. Dracoulis; G. J. Lane; T. Kibédi; M. L. Smith

doi:10.1103/PhysRevC.83.034322

Discovery of a nonyrast Kπ=8⁺ isomer in Dy162, and the influence of competing K-mixing mechanisms on its highly forbidden decay

T. P.D. Swan^*, P. M. Walker, Zs Podolyák, M. W. Reed, G. D. Dracoulis, G. J. Lane, T. Kibédi, M. L. Smith

^*Corresponding author for this work

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

9 Citations (SciVal)

Abstract

The Gd160(Be9,α3n)Dy162 reaction has been used to study high-spin states in Dy162. Pulsed beam conditions were utilized for enhanced isomer sensitivity. An isomer at 2188.1(3) keV with a half-life of 8.3(3) μs has been discovered and assigned Kπ= 8⁺ with a two-quasineutron configuration. Among 11 γ-ray decay branches, an E2, ΔK=8 transition to the ground-state band was observed with a reduced hindrance of f _ν=35, agreeing well with systematics correlating f_ν with the product of the valence neutron and proton numbers (N_pN _n) over an extended N,Z range. Small deviations from N _pN_n dependence are analyzed for a range of two-quasiparticle isomer decays and interpreted as arising from a weak dependence on the isomer excitation energy relative to the yrast line.

Original language	English
Article number	034322
Journal	Physical Review C - Nuclear Physics
Volume	83
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.83.034322
Publication status	Published - 28 Mar 2011

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title = "Discovery of a nonyrast Kπ=8+ isomer in Dy162, and the influence of competing K-mixing mechanisms on its highly forbidden decay",

abstract = "The Gd160(Be9,α3n)Dy162 reaction has been used to study high-spin states in Dy162. Pulsed beam conditions were utilized for enhanced isomer sensitivity. An isomer at 2188.1(3) keV with a half-life of 8.3(3) μs has been discovered and assigned Kπ= 8+ with a two-quasineutron configuration. Among 11 γ-ray decay branches, an E2, ΔK=8 transition to the ground-state band was observed with a reduced hindrance of f ν=35, agreeing well with systematics correlating fν with the product of the valence neutron and proton numbers (NpN n) over an extended N,Z range. Small deviations from N pNn dependence are analyzed for a range of two-quasiparticle isomer decays and interpreted as arising from a weak dependence on the isomer excitation energy relative to the yrast line.",

author = "Swan, {T. P.D.} and Walker, {P. M.} and Zs Podoly{\'a}k and Reed, {M. W.} and Dracoulis, {G. D.} and Lane, {G. J.} and T. Kib{\'e}di and Smith, {M. L.}",

year = "2011",

month = mar,

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doi = "10.1103/PhysRevC.83.034322",

language = "English",

volume = "83",

journal = "Physical Review C - Nuclear Physics",

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publisher = "American Physical Society",

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AU - Swan, T. P.D.

AU - Walker, P. M.

AU - Podolyák, Zs

AU - Reed, M. W.

AU - Dracoulis, G. D.

AU - Lane, G. J.

AU - Kibédi, T.

AU - Smith, M. L.

PY - 2011/3/28

Y1 - 2011/3/28

N2 - The Gd160(Be9,α3n)Dy162 reaction has been used to study high-spin states in Dy162. Pulsed beam conditions were utilized for enhanced isomer sensitivity. An isomer at 2188.1(3) keV with a half-life of 8.3(3) μs has been discovered and assigned Kπ= 8+ with a two-quasineutron configuration. Among 11 γ-ray decay branches, an E2, ΔK=8 transition to the ground-state band was observed with a reduced hindrance of f ν=35, agreeing well with systematics correlating fν with the product of the valence neutron and proton numbers (NpN n) over an extended N,Z range. Small deviations from N pNn dependence are analyzed for a range of two-quasiparticle isomer decays and interpreted as arising from a weak dependence on the isomer excitation energy relative to the yrast line.

AB - The Gd160(Be9,α3n)Dy162 reaction has been used to study high-spin states in Dy162. Pulsed beam conditions were utilized for enhanced isomer sensitivity. An isomer at 2188.1(3) keV with a half-life of 8.3(3) μs has been discovered and assigned Kπ= 8+ with a two-quasineutron configuration. Among 11 γ-ray decay branches, an E2, ΔK=8 transition to the ground-state band was observed with a reduced hindrance of f ν=35, agreeing well with systematics correlating fν with the product of the valence neutron and proton numbers (NpN n) over an extended N,Z range. Small deviations from N pNn dependence are analyzed for a range of two-quasiparticle isomer decays and interpreted as arising from a weak dependence on the isomer excitation energy relative to the yrast line.

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DO - 10.1103/PhysRevC.83.034322

M3 - Article

SN - 0556-2813

VL - 83

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 3

M1 - 034322

ER -

Discovery of a nonyrast Kπ=8⁺ isomer in Dy162, and the influence of competing K-mixing mechanisms on its highly forbidden decay

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