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Williams, N. Bernier, P. C. Srivastava, P. Ruotsalainen, P. T. Greenlees, R. Caballero-Folch, R. Frederick, R. Julin, S. Cruz, S. R. Stroberg, T. Grahn","submitted_at":"2018-11-02T08:26:19Z","abstract_excerpt":"The $T_z$~=~$-\\frac{3}{2}$ nucleus ${}^{21}$Mg has been studied by Coulomb excitation on ${}^{196}$Pt and ${}^{110}$Pd targets. A 205.6(1)-keV $\\gamma$-ray transition resulting from the Coulomb excitation of the $\\frac{5}{2}^+$ ground state to the first excited $\\frac{1}{2}^+$ state in ${}^{21}$Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the $\\frac{1}{2}^+$ state yield an adopted value of $B(E2;\\frac{5}{2}^+\\rightarrow\\frac{1}{2}^+)$~=~13.3(4)~W.u. 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