Low-lying isovector 2+ valence-shell excitations of $^{212}$Po

Abstract : 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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Contributor : Michel Lion <>
Submitted on : Thursday, January 21, 2016 - 1:02:33 PM
Last modification on : Thursday, February 1, 2018 - 1:25:54 AM

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D. Kocheva, G. Rainovski, J. Jolie, N. Pietralla, C. Stahl, et al.. Low-lying isovector 2+ valence-shell excitations of $^{212}$Po. Physical Review C, American Physical Society, 2016, 93, pp.011303(R). ⟨10.1103/PhysRevC.93.011303⟩. ⟨in2p3-01259972⟩

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