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

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

doi:10.1016/j.physletb.2018.05.064

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arXiv · 1709.03948

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

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Abstract

Many-body nuclear theory utilizing microscopic or chiral potentials has developed to the point that collectivity might be dealt with in an {\it ab initio} framework without the use of effective charges; for example with the proper evolution of operators, or alternatively, through the use of an appropriate and manageable subset of particle-hole excitations. We present a precise determination of $E2$ strength in $^{22}$Mg and its mirror $^{22}$Ne 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.

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J. Henderson, G. Hackman, P. Ruotsalainen, S. R. Stroberg, K. D. Launey, F. A. Ali, N. Bernier, M. A. Bentley, M. Bowry, R. Cabellero-Folch, L. J. Evitts, R. Frederick, A. B. Garnsworthy, P. E. Garrett, J. D. Holt, B. Jigmeddorj, A. I. Kilic, J. Measures, D. Muecher, B. Olaizola, E. O'Sullivan, O. Paetkau, J. Park, J. Smallcombe, C. E. Svensson, C. Y. Wu, R. Wadsworth. 2017-09-12. Testing microscopically derived descriptions of nuclear collectivity: Coulomb excitation of 22Mg. https://doi.org/10.1016/j.physletb.2018.05.064

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