Testing microscopically derived descriptions of nuclear collectivity: Coulomb excitation of 22Mg

J. Henderson*, G. Hackman, P. Ruotsalainen, S.R. Stroberg, K.D. Launey, J.D. Holt, F.A. Ali, N. Bernier, M.A. Bentley, M. Bowry, R. Caballero-Folch, L.J. Evitts, R. Frederick, A.B. Garnsworthy, P.E. Garrett, B. Jigmeddorj, A.I. Kilic, J. Lassen, J. Measures, D. MuecherB. Olaizola, E. O'Sullivan, O. Paetkau, J. Park, J. Smallcombe, C.E. Svensson, R. Wadsworth, C.Y. Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)
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Abstract

Many-body nuclear theory utilizing microscopic or chiral potentials has developed to the point that collectivity might be studied within a microscopic or ab initio framework without the use of effective charges; for example with the proper evolution of the E2 operator, or alternatively, through the use of an appropriate and manageable subset of particle–hole excitations. We present a precise determination of E2 strength in 22Mg and its mirror 22Ne by Coulomb excitation, allowing for rigorous comparisons with theory. No-core symplectic shell-model calculations were performed and agree with the new B(E2) values while in-medium similarity-renormalization-group calculations consistently underpredict the absolute strength, with the missing strength found to have both isoscalar and isovector components. The discrepancy between two microscopic models demonstrates the sensitivity of E2 strength to the choice of many-body approximation employed.
Original languageEnglish
Pages (from-to)468-473
Number of pages6
JournalPhysics Letters B
Volume782
Early online date31 May 2018
DOIs
Publication statusPublished - 10 Jul 2018
Externally publishedYes

Keywords

  • 22Mg
  • 22Ne
  • Ab initio
  • Collectivity
  • Coulomb excitation

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