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Lifetime measurements in $^{63}$Co and $^{65}$Co

Abstract : Lifetimes of the $9/2^-_1$ and $3/2^-_1$ states in $^{63}$Co and the $9/2^-_1$ state in $^{65}$Co were measured using the recoil distance Doppler shift and the differential decay curve methods. The nuclei were populated by multi-nucleon transfer reactions in inverse kinematics. Gamma rays were measured with the EXOGAM Ge array and the recoiling fragments were fully identified using the large-acceptance VAMOS spectrometer. The E2 transition probabilities from the $3/2^-_1$ and $9/2^-_1$ states to the $7/2^-$ ground state could be extracted in $^{63}$Co as well as an upper limit for the $9/2^-_1\rightarrow7/2^-_1$ $B$(E2) value in $^{65}$Co. The experimental results were compared to large-scale shell-model calculations in the $pf$ and $pfg_{9/2}$ model spaces, allowing to draw conclusions on the single-particle or collective nature of the various states.
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Submitted on : Tuesday, June 14, 2011 - 3:16:55 PM
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A. Dijon, E. Clément, G. de France, P. van Isacker, J. Ljungvall, et al.. Lifetime measurements in $^{63}$Co and $^{65}$Co. Physical Review C, American Physical Society, 2011, 83, pp.064321. ⟨10.1103/PhysRevC.83.064321⟩. ⟨in2p3-00600325⟩



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