Evidence for shape coexistence and superdeformation in 24Mg

J. T.H. Dowie; T. Kibédi; D. G. Jenkins; A. E. Stuchbery; A. Akber; H. A. Alshammari; N. Aoi; A. Avaa; L. J. Bignell; M. V. Chisapi; B. J. Coombes; T. K. Eriksen; M. S.M. Gerathy; T. J. Gray; T. H. Hoang; E. Ideguchi; P. Jones; M. Kumar Raju; G. J. Lane; B. P. McCormick; L. J. McKie; A. J. Mitchell; N. J. Spinks; B. P.E. Tee

doi:10.1016/j.physletb.2020.135855

Evidence for shape coexistence and superdeformation in ²⁴Mg

J. T.H. Dowie^*
, T. Kibédi
, D. G. Jenkins
, A. E. Stuchbery
, A. Akber
, H. A. Alshammari
, N. Aoi
, A. Avaa
, L. J. Bignell
, M. V. Chisapi
, B. J. Coombes
, T. K. Eriksen
, M. S.M. Gerathy
, T. J. Gray
, T. H. Hoang
, E. Ideguchi
, P. Jones
, M. Kumar Raju
, G. J. Lane
, B. P. McCormick

L. J. McKie, A. J. Mitchell, N. J. Spinks, B. P.E. Tee

^*Corresponding author for this work

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

14 Citations (Scopus)

Abstract

The E0 transition depopulating the first-excited 0⁺ state in ²⁴Mg has been observed for the first time, and the E0 transition strength determined by electron-positron pair and γ-ray spectroscopy measurements performed using the Super-e pair spectrometer. The E0 transition strength is ρ²×10³=380(70). A two-state mixing model implies a deformation of the first-excited 0⁺ state of β₂≈1 and a change in the mean-square charge radius of Δ〈r²〉≈1.9fm², which suggests a significant shape change between the ground state and first-excited 0⁺ state in ²⁴Mg. The observed E0 strength gives direct evidence of shape coexistence and superdeformation in ²⁴Mg, bringing this nucleus into line with similar behaviour in nearby N=Z nuclei. This result agrees with recent theoretical work on the cluster nature of ²⁴Mg and has potential ramifications for nuclear reactions of astrophysical importance.

Original language	English
Article number	135855
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	811
DOIs	https://doi.org/10.1016/j.physletb.2020.135855
Publication status	Published - 10 Dec 2020

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Dowie, J. T. H., Kibédi, T., Jenkins, D. G., Stuchbery, A. E., Akber, A., Alshammari, H. A., Aoi, N., Avaa, A., Bignell, L. J., Chisapi, M. V., Coombes, B. J., Eriksen, T. K., Gerathy, M. S. M., Gray, T. J., Hoang, T. H., Ideguchi, E., Jones, P., Kumar Raju, M., Lane, G. J., ... Tee, B. P. E. (2020). Evidence for shape coexistence and superdeformation in ²⁴Mg. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 811, Article 135855. https://doi.org/10.1016/j.physletb.2020.135855

@article{75a719b41f7a43d590b100f6c27a21f9,

title = "Evidence for shape coexistence and superdeformation in 24Mg",

abstract = "The E0 transition depopulating the first-excited 0+ state in 24Mg has been observed for the first time, and the E0 transition strength determined by electron-positron pair and γ-ray spectroscopy measurements performed using the Super-e pair spectrometer. The E0 transition strength is ρ2×103=380(70). A two-state mixing model implies a deformation of the first-excited 0+ state of β2≈1 and a change in the mean-square charge radius of Δ〈r2〉≈1.9fm2, which suggests a significant shape change between the ground state and first-excited 0+ state in 24Mg. The observed E0 strength gives direct evidence of shape coexistence and superdeformation in 24Mg, bringing this nucleus into line with similar behaviour in nearby N=Z nuclei. This result agrees with recent theoretical work on the cluster nature of 24Mg and has potential ramifications for nuclear reactions of astrophysical importance.",

keywords = "Electric monopole (E0) transitions, Electron-positron pair spectroscopy, Nuclear structure, Shape coexistence, Superdeformation, γ-Ray spectroscopy",

author = "Dowie, \{J. T.H.\} and T. Kib{\'e}di and Jenkins, \{D. G.\} and Stuchbery, \{A. E.\} and A. Akber and Alshammari, \{H. A.\} and N. Aoi and A. Avaa and Bignell, \{L. J.\} and Chisapi, \{M. V.\} and Coombes, \{B. J.\} and Eriksen, \{T. K.\} and Gerathy, \{M. S.M.\} and Gray, \{T. J.\} and Hoang, \{T. H.\} and E. Ideguchi and P. Jones and \{Kumar Raju\}, M. and Lane, \{G. J.\} and McCormick, \{B. P.\} and McKie, \{L. J.\} and Mitchell, \{A. J.\} and Spinks, \{N. J.\} and Tee, \{B. P.E.\}",

note = "Publisher Copyright: {\textcopyright} 2020 The Author(s)",

year = "2020",

month = dec,

day = "10",

doi = "10.1016/j.physletb.2020.135855",

language = "English",

volume = "811",

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

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

Dowie, JTH, Kibédi, T, Jenkins, DG, Stuchbery, AE, Akber, A, Alshammari, HA, Aoi, N, Avaa, A, Bignell, LJ, Chisapi, MV, Coombes, BJ, Eriksen, TK, Gerathy, MSM, Gray, TJ, Hoang, TH, Ideguchi, E, Jones, P, Kumar Raju, M, Lane, GJ , McCormick, BP, McKie, LJ, Mitchell, AJ, Spinks, NJ & Tee, BPE 2020, 'Evidence for shape coexistence and superdeformation in ²⁴Mg', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 811, 135855. https://doi.org/10.1016/j.physletb.2020.135855

TY - JOUR

T1 - Evidence for shape coexistence and superdeformation in 24Mg

AU - Dowie, J. T.H.

AU - Kibédi, T.

AU - Jenkins, D. G.

AU - Stuchbery, A. E.

AU - Akber, A.

AU - Alshammari, H. A.

AU - Aoi, N.

AU - Avaa, A.

AU - Bignell, L. J.

AU - Chisapi, M. V.

AU - Coombes, B. J.

AU - Eriksen, T. K.

AU - Gerathy, M. S.M.

AU - Gray, T. J.

AU - Hoang, T. H.

AU - Ideguchi, E.

AU - Jones, P.

AU - Kumar Raju, M.

AU - Lane, G. J.

AU - McCormick, B. P.

AU - McKie, L. J.

AU - Mitchell, A. J.

AU - Spinks, N. J.

AU - Tee, B. P.E.

PY - 2020/12/10

Y1 - 2020/12/10

N2 - The E0 transition depopulating the first-excited 0+ state in 24Mg has been observed for the first time, and the E0 transition strength determined by electron-positron pair and γ-ray spectroscopy measurements performed using the Super-e pair spectrometer. The E0 transition strength is ρ2×103=380(70). A two-state mixing model implies a deformation of the first-excited 0+ state of β2≈1 and a change in the mean-square charge radius of Δ〈r2〉≈1.9fm2, which suggests a significant shape change between the ground state and first-excited 0+ state in 24Mg. The observed E0 strength gives direct evidence of shape coexistence and superdeformation in 24Mg, bringing this nucleus into line with similar behaviour in nearby N=Z nuclei. This result agrees with recent theoretical work on the cluster nature of 24Mg and has potential ramifications for nuclear reactions of astrophysical importance.

AB - The E0 transition depopulating the first-excited 0+ state in 24Mg has been observed for the first time, and the E0 transition strength determined by electron-positron pair and γ-ray spectroscopy measurements performed using the Super-e pair spectrometer. The E0 transition strength is ρ2×103=380(70). A two-state mixing model implies a deformation of the first-excited 0+ state of β2≈1 and a change in the mean-square charge radius of Δ〈r2〉≈1.9fm2, which suggests a significant shape change between the ground state and first-excited 0+ state in 24Mg. The observed E0 strength gives direct evidence of shape coexistence and superdeformation in 24Mg, bringing this nucleus into line with similar behaviour in nearby N=Z nuclei. This result agrees with recent theoretical work on the cluster nature of 24Mg and has potential ramifications for nuclear reactions of astrophysical importance.

KW - Electric monopole (E0) transitions

KW - Electron-positron pair spectroscopy

KW - Nuclear structure

KW - Shape coexistence

KW - Superdeformation

KW - γ-Ray spectroscopy

UR - https://www.scopus.com/pages/publications/85092931932

U2 - 10.1016/j.physletb.2020.135855

DO - 10.1016/j.physletb.2020.135855

M3 - Article

SN - 0370-2693

VL - 811

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

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

M1 - 135855

ER -

Evidence for shape coexistence and superdeformation in ²⁴Mg

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