학술논문
Evidence for shape coexistence and superdeformation in 24Mg
Document Type
article
Author
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
Source
Physics Letters B, Vol 811, Iss , Pp 135855- (2020)
Subject
Language
English
ISSN
0370-2693
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.