Evidence for shape coexistence and superdeformation in 24Mg

被引：14

作者：

Dowie, J. T. H. ^{[1
]}

Kibedi, T. ^{[1
]}

Jenkins, D. G. ^{[2
,3
]}

Stuchbery, A. E. ^{[1
]}

Akber, A. ^{[1
]}

Alshammari, H. A. ^{[1
]}

Aoi, N. ^{[4
]}

Avaa, A. ^{[5
,6
]}

Bignell, L. J. ^{[1
]}

Chisapi, M., V ^{[5
,7
]}

Coombes, B. J. ^{[1
]}

Eriksen, T. K. ^{[1
,8
]}

Gerathy, M. S. M. ^{[1
]}

Gray, T. J. ^{[1
]}

Hoang, T. H. ^{[4
]}

Ideguchi, E. ^{[4
]}

Jones, P. ^{[5
]}

Raju, M. Kumar ^{[4
]}

Lane, G. J. ^{[1
]}

McCormick, B. P. ^{[1
]}

McKie, L. J. ^{[1
]}

Mitchell, A. J. ^{[1
]}

Spinks, N. J. ^{[1
]}

Tee, B. P. E. ^{[1
]}

机构：

[1] Australian Natl Univ, Res Sch Phys, Dept Nucl Phys, Canberra, ACT 2601, Australia

[2] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

[3] Univ Strasbourg, Inst Adv Studies USIAS, Strasbourg, France

[4] Res Ctr Nucl Phys RCNP, 10-1 Mihogaoka, Ibaraki, Osaka 5670047, Japan

[5] iThemba Labs, Dept Subat Phys, POB 722, ZA-7129 Somerset West, South Africa

[6] Univ Witwatersrand, Sch Phys, ZA-2000 Johannesburg, South Africa

[7] Stellenbosch Univ, Fac Sci, Dept Phys, Private Bag X1, ZA-7602 Stellenbosch, South Africa

[8] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

来源：

PHYSICS LETTERS B | 2020年 / 811卷

基金：

澳大利亚研究理事会; 新加坡国家研究基金会;

关键词：

Shape coexistence; Electric monopole (E0) transitions; Superdeformation; Electron-positron pair spectroscopy; gamma-Ray spectroscopy; Nuclear structure; ELECTRIC MONOPOLE TRANSITIONS; ALPHA-CLUSTER CONFIGURATIONS; DEFORMED MEAN-FIELD; INELASTIC-SCATTERING; LIFETIME MEASUREMENTS; ROTATIONAL BANDS; EXCITED-STATES; MEV PROTONS; GAMMA-RAY; NUCLEI;

D O I：

10.1016/j.physletb.2020.135855

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The E0transition depopulating the first-excited 0(+) state in Mg-24 has been observed for the first time, and the E0transition strength determined by electron-positron pair and.-ray spectroscopy measurements performed using the Super-e pair spectrometer. The E0 transition strength is rho(2) x 10(3)= 380(70). A two-state mixing model implies a deformation of the first-excited 0+ state of beta(2) approximate to 1 and a change in the mean-square charge radius of Delta < r(2)> approximate to 1.9fm(2), which suggests a significant shape change between the ground state and first-excited 0(+) state in Mg-24. The observed E0strength gives direct evidence of shape coexistence and superdeformation in Mg-24, bringing this nucleus into line with similar behaviour in nearby N= Znuclei. This result agrees with recent theoretical work on the cluster nature of Mg-24 and has potential ramifications for nuclear reactions of astrophysical importance. (C) 2020 The Author(s). Published by Elsevier B.V.

引用

页数：6

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