Spectroscopy of 155Gd following Coulomb excitation: Signature-independent M1 properties and evidence for octupole correlations

A. E. Stuchbery; G. J. Lampan; H. H. Bolotin

doi:10.1016/S0375-9474(98)00540-5

Spectroscopy of ¹⁵⁵Gd following Coulomb excitation: Signature-independent M1 properties and evidence for octupole correlations

A. E. Stuchbery^*, G. J. Lampan, H. H. Bolotin

^*Corresponding author for this work

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

16 Citations (Scopus)

Abstract

The spectroscopy of ¹⁵⁵Gd has been studied following Coulomb excitation. Gyromagnetic ratios were measured in the 3/2^- [521] ground-state band by the transient field technique and the identification of states up to spin 23/2^- in the ground-state band was confirmed by γ-γ coincidence measurements. Level lifetimes were deduced from Doppler broadened lineshapes; γ-ray branching intensities and multipolarity mixing ratios were determined from particle-γ-ray angular correlations. The population of a positive parity band (mainly 3/2⁺[651]) by E3 Coulomb excitation from the ground-state band provides evidence of octupole correlations. Particle-rotor model calculations were performed for the negative parity states. The spectroscopy is best described when the Coriolis interactions are attenuated by ≈50%.

Original language	English
Pages (from-to)	361-386
Number of pages	26
Journal	Nuclear Physics A
Volume	642
Issue number	3-4
DOIs	https://doi.org/10.1016/S0375-9474(98)00540-5
Publication status	Published - 9 Nov 1998

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@article{ee984348c6c14bdab456cb111f272bd1,

title = "Spectroscopy of 155Gd following Coulomb excitation: Signature-independent M1 properties and evidence for octupole correlations",

abstract = "The spectroscopy of 155Gd has been studied following Coulomb excitation. Gyromagnetic ratios were measured in the 3/2- [521] ground-state band by the transient field technique and the identification of states up to spin 23/2- in the ground-state band was confirmed by γ-γ coincidence measurements. Level lifetimes were deduced from Doppler broadened lineshapes; γ-ray branching intensities and multipolarity mixing ratios were determined from particle-γ-ray angular correlations. The population of a positive parity band (mainly 3/2+[651]) by E3 Coulomb excitation from the ground-state band provides evidence of octupole correlations. Particle-rotor model calculations were performed for the negative parity states. The spectroscopy is best described when the Coriolis interactions are attenuated by ≈50%.",

keywords = "Gd levels, NUCLEAR REACTIONS Gd(Ni,Ni′) E= 180, 220, 230 MeV; measured γ(θ, H, T) in thin polarized Fe, (particle)γ-coin., γ-γ-coin., Coulomb Excitation",

author = "Stuchbery, {A. E.} and Lampan, {G. J.} and Bolotin, {H. H.}",

year = "1998",

month = nov,

day = "9",

doi = "10.1016/S0375-9474(98)00540-5",

language = "English",

volume = "642",

pages = "361--386",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier B.V.",

number = "3-4",

}

TY - JOUR

T1 - Spectroscopy of 155Gd following Coulomb excitation

T2 - Signature-independent M1 properties and evidence for octupole correlations

AU - Stuchbery, A. E.

AU - Lampan, G. J.

AU - Bolotin, H. H.

PY - 1998/11/9

Y1 - 1998/11/9

N2 - The spectroscopy of 155Gd has been studied following Coulomb excitation. Gyromagnetic ratios were measured in the 3/2- [521] ground-state band by the transient field technique and the identification of states up to spin 23/2- in the ground-state band was confirmed by γ-γ coincidence measurements. Level lifetimes were deduced from Doppler broadened lineshapes; γ-ray branching intensities and multipolarity mixing ratios were determined from particle-γ-ray angular correlations. The population of a positive parity band (mainly 3/2+[651]) by E3 Coulomb excitation from the ground-state band provides evidence of octupole correlations. Particle-rotor model calculations were performed for the negative parity states. The spectroscopy is best described when the Coriolis interactions are attenuated by ≈50%.

AB - The spectroscopy of 155Gd has been studied following Coulomb excitation. Gyromagnetic ratios were measured in the 3/2- [521] ground-state band by the transient field technique and the identification of states up to spin 23/2- in the ground-state band was confirmed by γ-γ coincidence measurements. Level lifetimes were deduced from Doppler broadened lineshapes; γ-ray branching intensities and multipolarity mixing ratios were determined from particle-γ-ray angular correlations. The population of a positive parity band (mainly 3/2+[651]) by E3 Coulomb excitation from the ground-state band provides evidence of octupole correlations. Particle-rotor model calculations were performed for the negative parity states. The spectroscopy is best described when the Coriolis interactions are attenuated by ≈50%.

KW - Gd levels

KW - NUCLEAR REACTIONS Gd(Ni,Ni′) E= 180, 220, 230 MeV; measured γ(θ, H, T) in thin polarized Fe, (particle)γ-coin., γ-γ-coin., Coulomb Excitation

UR - http://www.scopus.com/inward/record.url?scp=0032501024&partnerID=8YFLogxK

U2 - 10.1016/S0375-9474(98)00540-5

DO - 10.1016/S0375-9474(98)00540-5

M3 - Article

SN - 0375-9474

VL - 642

SP - 361

EP - 386

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 3-4

ER -

Spectroscopy of ¹⁵⁵Gd following Coulomb excitation: Signature-independent M1 properties and evidence for octupole correlations

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