Long-lived three-quasiparticle isomers in 191Ir and 193Ir with triaxial deformation

G. D. Dracoulis; G. J. Lane; A. P. Byrne; H. Watanabe; R. O. Hughes; N. Palalani; F. G. Kondev; M. Carpenter; R. V.F. Janssens; T. Lauritsen; C. J. Lister; D. Seweryniak; S. Zhu; P. Chowdhury; Y. Shi; F. R. Xu

doi:10.1016/j.physletb.2012.02.008

Long-lived three-quasiparticle isomers in ¹⁹¹Ir and ¹⁹³Ir with triaxial deformation

G. D. Dracoulis^*, G. J. Lane, A. P. Byrne, H. Watanabe, R. O. Hughes, N. Palalani, F. G. Kondev, M. Carpenter, R. V.F. Janssens, T. Lauritsen, C. J. Lister, D. Seweryniak, S. Zhu, P. Chowdhury, Y. Shi, F. R. Xu

^*Corresponding author for this work

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Abstract

Deep-inelastic reactions have been used to populate high-spin states in the iridium isotopes. New results include the identification of particularly long-lived three-quasiparticle isomers in ¹⁹¹Ir and ¹⁹³Ir, with mean-lives of 8.2(7) s and 180(3) μs respectively, decaying into newly identified states of the h _11/2 proton bands and into other structures. Spins and parities of J ^π=31/2 ⁺ are suggested for both, consistent with coupling of the 11/2 ^-[505] proton to the 10 ^- two-neutron excitations in the cores. These and other configurations are discussed in the context of configuration constrained potential-energy-surface calculations. All calculated intrinsic states are expected to be associated with triaxial shapes and the extreme isomerism observed is attributed to spin-trapping rather than K-hindrance.

Original language	English
Pages (from-to)	59-64
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	709
Issue number	1-2
DOIs	https://doi.org/10.1016/j.physletb.2012.02.008
Publication status	Published - 13 Mar 2012

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Dracoulis, G. D., Lane, G. J., Byrne, A. P., Watanabe, H., Hughes, R. O., Palalani, N., Kondev, F. G., Carpenter, M., Janssens, R. V. F., Lauritsen, T., Lister, C. J., Seweryniak, D., Zhu, S., Chowdhury, P., Shi, Y., & Xu, F. R. (2012). Long-lived three-quasiparticle isomers in ¹⁹¹Ir and ¹⁹³Ir with triaxial deformation. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 709(1-2), 59-64. https://doi.org/10.1016/j.physletb.2012.02.008

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title = "Long-lived three-quasiparticle isomers in 191Ir and 193Ir with triaxial deformation",

abstract = "Deep-inelastic reactions have been used to populate high-spin states in the iridium isotopes. New results include the identification of particularly long-lived three-quasiparticle isomers in 191Ir and 193Ir, with mean-lives of 8.2(7) s and 180(3) μs respectively, decaying into newly identified states of the h 11/2 proton bands and into other structures. Spins and parities of J π=31/2 + are suggested for both, consistent with coupling of the 11/2 -[505] proton to the 10 - two-neutron excitations in the cores. These and other configurations are discussed in the context of configuration constrained potential-energy-surface calculations. All calculated intrinsic states are expected to be associated with triaxial shapes and the extreme isomerism observed is attributed to spin-trapping rather than K-hindrance.",

author = "Dracoulis, \{G. D.\} and Lane, \{G. J.\} and Byrne, \{A. P.\} and H. Watanabe and Hughes, \{R. O.\} and N. Palalani and Kondev, \{F. G.\} and M. Carpenter and Janssens, \{R. V.F.\} and T. Lauritsen and Lister, \{C. J.\} and D. Seweryniak and S. Zhu and P. Chowdhury and Y. Shi and Xu, \{F. R.\}",

year = "2012",

month = mar,

day = "13",

doi = "10.1016/j.physletb.2012.02.008",

language = "English",

volume = "709",

pages = "59--64",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

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publisher = "Elsevier B.V.",

number = "1-2",

}

Dracoulis, GD, Lane, GJ, Byrne, AP, Watanabe, H, Hughes, RO, Palalani, N, Kondev, FG, Carpenter, M, Janssens, RVF, Lauritsen, T, Lister, CJ, Seweryniak, D, Zhu, S, Chowdhury, P, Shi, Y & Xu, FR 2012, 'Long-lived three-quasiparticle isomers in ¹⁹¹Ir and ¹⁹³Ir with triaxial deformation', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 709, no. 1-2, pp. 59-64. https://doi.org/10.1016/j.physletb.2012.02.008

TY - JOUR

T1 - Long-lived three-quasiparticle isomers in 191Ir and 193Ir with triaxial deformation

AU - Dracoulis, G. D.

AU - Lane, G. J.

AU - Byrne, A. P.

AU - Watanabe, H.

AU - Hughes, R. O.

AU - Palalani, N.

AU - Kondev, F. G.

AU - Carpenter, M.

AU - Janssens, R. V.F.

AU - Lauritsen, T.

AU - Lister, C. J.

AU - Seweryniak, D.

AU - Zhu, S.

AU - Chowdhury, P.

AU - Shi, Y.

AU - Xu, F. R.

PY - 2012/3/13

Y1 - 2012/3/13

N2 - Deep-inelastic reactions have been used to populate high-spin states in the iridium isotopes. New results include the identification of particularly long-lived three-quasiparticle isomers in 191Ir and 193Ir, with mean-lives of 8.2(7) s and 180(3) μs respectively, decaying into newly identified states of the h 11/2 proton bands and into other structures. Spins and parities of J π=31/2 + are suggested for both, consistent with coupling of the 11/2 -[505] proton to the 10 - two-neutron excitations in the cores. These and other configurations are discussed in the context of configuration constrained potential-energy-surface calculations. All calculated intrinsic states are expected to be associated with triaxial shapes and the extreme isomerism observed is attributed to spin-trapping rather than K-hindrance.

AB - Deep-inelastic reactions have been used to populate high-spin states in the iridium isotopes. New results include the identification of particularly long-lived three-quasiparticle isomers in 191Ir and 193Ir, with mean-lives of 8.2(7) s and 180(3) μs respectively, decaying into newly identified states of the h 11/2 proton bands and into other structures. Spins and parities of J π=31/2 + are suggested for both, consistent with coupling of the 11/2 -[505] proton to the 10 - two-neutron excitations in the cores. These and other configurations are discussed in the context of configuration constrained potential-energy-surface calculations. All calculated intrinsic states are expected to be associated with triaxial shapes and the extreme isomerism observed is attributed to spin-trapping rather than K-hindrance.

UR - https://www.scopus.com/pages/publications/84857053632

U2 - 10.1016/j.physletb.2012.02.008

DO - 10.1016/j.physletb.2012.02.008

M3 - Article

SN - 0370-2693

VL - 709

SP - 59

EP - 64

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-2

ER -

Long-lived three-quasiparticle isomers in ¹⁹¹Ir and ¹⁹³Ir with triaxial deformation

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