Low-lying isovector 2+ valence-shell excitations of $^{212}$Po
2016
We present the results from an experiment dedicated to search for quadrupole-collective isovector valence-shell
excitations, states with so-called mixed proton-neutron symmetry (MSS), of 212Po. This nucleus was studied
in an α-transfer reaction. The lifetimes of two short-lived excited states, candidates for the one-phonon MSS,
were determined by utilizing the Doppler shift attenuation method. The experimental results are in qualitative
agreement with a simple single-j shell model calculation, which, together with the observed lack of quadrupole
collectivity, indicates that the isovector nature of low-lying states is a property of the leading single-particle
valence shell configuration.
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