Evidence for shape coexistence and superdeformation in 24Mg
| Autor: | T. H. Hoang, T. K. Eriksen, B. J. Coombes, Alan Mitchell, Gregory Lane, Eiji Ideguchi, J. T. H. Dowie, N. J. Spinks, D. G. Jenkins, Peter B. Jones, H.A. Alshammari, B. P. McCormick, M. S. M. Gerathy, T. J. Gray, Lindsey J. Bignell, M. Kumar Raju, Andrew Stuchbery, M. V. Chisapi, Tibor Kibedi, L.J. McKie, Nori Aoi, A. A. Avaa, B.P.E. Tee, A. Akber |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Nuclear reaction
Physics Nuclear and High Energy Physics 010308 nuclear & particles physics Electric monopole (E0) transitions Electron-positron pair spectroscopy Nuclear structure Shape coexistence 7. Clean energy 01 natural sciences lcsh:QC1-999 Superdeformation Charge radius 0103 physical sciences Atomic physics Deformation (engineering) 010306 general physics Ground state Spectroscopy γ-Ray spectroscopy lcsh:Physics Line (formation) |
| Zdroj: | Physics Letters B, Vol 811, Iss, Pp 135855-(2020) |
| ISSN: | 0370-2693 |
| Popis: | 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 ρ 2 × 10 3 = 380 ( 70 ) . A two-state mixing model implies a deformation of the first-excited 0 + state of β 2 ≈ 1 and a change in the mean-square charge radius of Δ 〈 r 2 〉 ≈ 1.9 fm 2 , 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. |
| Databáze: | OpenAIRE |
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