Isospin symmetry in B(E2) values: Coulomb excitation study of 21Mg

P. Ruotsalainen, J. Henderson, G Hackman, G. H. Sargsyan, K.D. Launey, A. Saxena, P. C. Srivastava, S. R. Stroberg, T Grahn, J. Pakarinen, G. C. Ball, R Julin, P. T. Greenlees, J. Smallcombe, Corina Andreoiu, Nikita Bernier, M. Bowry, M. Buckner, R. Caballero-Folch, A. ChesterS. Cruz, L. J. Evitts, R. Frederick, A B Garnsworthy, Matthias Holl, A. Kurkjian, D. Kisliuk, K. G. Leach, E. Mcgee, James Measures, D Mücher, Joochun Park, F Sarazin, J. K. Smith, D. Southall, Krzysztof Starosta, C. E. Svensson, K. Whitmore, M. Williams, C.Y. Wu

Research output: Contribution to journalArticlepeer-review

10 Citations (SciVal)

Abstract

The Tz=−32 nucleus 21Mg has been studied by Coulomb excitation on 196Pt and 110Pd targets. A 205.6(1)-keV γ-ray transition resulting from the Coulomb excitation of the 52+ ground state to the first excited 12+ state in 21Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the 12+ state yield an adopted value of B(E2;52+→12+)=13.3(4) W.u. A new excited state at 1672(1) keV with tentative 92+ assignment was also identified in 21Mg. This work demonstrates a large difference in the B(E2;52+→12+) value between T=32, A=21 mirror nuclei. The difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions and using modern ab initio nuclear structure calculations, which have recently become applicable in the sd shell.
Original languageEnglish
Article number051301(R)
JournalPhysical Review C: covering nuclear physics
DOIs
Publication statusPublished - 2019
Externally publishedYes

Subject classification (UKÄ)

  • Subatomic Physics

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