Discovery of isomers in dysprosium, holmium, and erbium isotopes with N=94 to 97

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.85.024313

Discovery of isomers in dysprosium, holmium, and erbium isotopes with N=94 to 97

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

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Abstract

High-spin states in the 68164Er⁹⁶ region were studied using 9Be + 160Gd reactions. Pulsed beam conditions were exploited for enhanced sensitivity to delayed γ-ray transitions. New isomers were identified in 161Dy, 163Ho, 162Er, and 165Er. The 162Er isomer is interpreted to decay by E1 transitions to the ground-state band with a reduced hindrance of f _ν=33. A plot of f_ν values for all ΔK=7, E1 transitions from two-quasiparticle isomers to the ground-state bands of even-even nuclei reveals only a small influence from the dynamic to kinematic moment-of-inertia ratio, which provides a measure of Coriolis K mixing within the ground-state band. This is interpreted to imply that the relatively low hindrances are due to K mixing in the isomer, caused by a combination of Coriolis and octupole band mixing.

Original language	English
Article number	024313
Journal	Physical Review C - Nuclear Physics
Volume	85
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.85.024313
Publication status	Published - 21 Feb 2012

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10.1103/PhysRevC.85.024313

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title = "Discovery of isomers in dysprosium, holmium, and erbium isotopes with N=94 to 97",

abstract = "High-spin states in the 68164Er96 region were studied using 9Be + 160Gd reactions. Pulsed beam conditions were exploited for enhanced sensitivity to delayed γ-ray transitions. New isomers were identified in 161Dy, 163Ho, 162Er, and 165Er. The 162Er isomer is interpreted to decay by E1 transitions to the ground-state band with a reduced hindrance of f ν=33. A plot of fν values for all ΔK=7, E1 transitions from two-quasiparticle isomers to the ground-state bands of even-even nuclei reveals only a small influence from the dynamic to kinematic moment-of-inertia ratio, which provides a measure of Coriolis K mixing within the ground-state band. This is interpreted to imply that the relatively low hindrances are due to K mixing in the isomer, caused by a combination of Coriolis and octupole band mixing.",

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 = "2012",

month = feb,

day = "21",

doi = "10.1103/PhysRevC.85.024313",

language = "English",

volume = "85",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

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T1 - Discovery of isomers in dysprosium, holmium, and erbium isotopes with N=94 to 97

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 - 2012/2/21

Y1 - 2012/2/21

N2 - High-spin states in the 68164Er96 region were studied using 9Be + 160Gd reactions. Pulsed beam conditions were exploited for enhanced sensitivity to delayed γ-ray transitions. New isomers were identified in 161Dy, 163Ho, 162Er, and 165Er. The 162Er isomer is interpreted to decay by E1 transitions to the ground-state band with a reduced hindrance of f ν=33. A plot of fν values for all ΔK=7, E1 transitions from two-quasiparticle isomers to the ground-state bands of even-even nuclei reveals only a small influence from the dynamic to kinematic moment-of-inertia ratio, which provides a measure of Coriolis K mixing within the ground-state band. This is interpreted to imply that the relatively low hindrances are due to K mixing in the isomer, caused by a combination of Coriolis and octupole band mixing.

AB - High-spin states in the 68164Er96 region were studied using 9Be + 160Gd reactions. Pulsed beam conditions were exploited for enhanced sensitivity to delayed γ-ray transitions. New isomers were identified in 161Dy, 163Ho, 162Er, and 165Er. The 162Er isomer is interpreted to decay by E1 transitions to the ground-state band with a reduced hindrance of f ν=33. A plot of fν values for all ΔK=7, E1 transitions from two-quasiparticle isomers to the ground-state bands of even-even nuclei reveals only a small influence from the dynamic to kinematic moment-of-inertia ratio, which provides a measure of Coriolis K mixing within the ground-state band. This is interpreted to imply that the relatively low hindrances are due to K mixing in the isomer, caused by a combination of Coriolis and octupole band mixing.

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U2 - 10.1103/PhysRevC.85.024313

DO - 10.1103/PhysRevC.85.024313

M3 - Article

SN - 0556-2813

VL - 85

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 2

M1 - 024313

ER -

Discovery of isomers in dysprosium, holmium, and erbium isotopes with N=94 to 97

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