Lifetime measurements of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">C</mml:mi><mml:mprescripts/><mml:none/><mml:mn>17</mml:mn></mml:mmultiscripts></mml:math>excited states and three-body and continuum effects

We studied transition rates for the lowest $1/{2}^{+}$ and $5/{2}^{+}$ excited states of $^{17}\mathrm{C}$ through lifetime measurements with the GRETINA array using the recoil-distance method. The present measurements provide a model-independent determination of transition strengths giving the values of $B(M1;1/{2}^{+}\ensuremath{\rightarrow}3/{2}_{\mathrm{g}.\mathrm{s}.}^{+})=1.{04}_{\ensuremath{-}0.12}^{+0.03}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}{\ensuremath{\mu}}_{N}^{2}$ and $B(M1;5/{2}^{+}\ensuremath{\rightarrow}3/{2}_{\mathrm{g}.\mathrm{s}.}^{+})=7.{12}_{\ensuremath{-}0.96}^{+1.27}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}{\ensuremath{\mu}}_{N}^{2}$. The quenched $M1$ transition strength for the $1/{2}^{+}\ensuremath{\rightarrow}3/{2}_{\mathrm{g}.\mathrm{s}.}^{+}$ transition, with respect to the $5/{2}^{+}\ensuremath{\rightarrow}3/{2}_{\mathrm{g}.\mathrm{s}.}^{+}$ transition, has been confirmed with greater precision. The current data are compared to importance-truncated no-core shell model calculations addressing effects due to continuum and three-body forces.

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