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First observation of high-spin states in $^{214}$Po: Probing the valence space beyond $^{208$}Pb

A. Astier 1 M.-G. Porquet 1
1 CSNSM SNO
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : Excited states in Po-214 have been populated using the O-18 + Pb-208 reaction at 85-MeV beam energy and studied with the Euroball IV gamma-multidetector array. The level scheme has been built up to similar to 2.7-MeV excitation energy and spin I = 12 (h) over bar from the triple-gamma coincidence data. Spin and parity values of most of the observed states have been assigned from the gamma-angular properties. The configurations of the yrast states are discussed using results of empirical shell-model calculations and by analogy with the neighboring nuclei. The Po-214 level scheme established in this work constitutes an important step for the determination of the effective nucleon-nucleon interactions beyond N = 126.
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A. Astier, M.-G. Porquet. First observation of high-spin states in $^{214}$Po: Probing the valence space beyond $^{208$}Pb. Physical Review C, American Physical Society, 2011, 83, pp.014311. ⟨10.1103/PhysRevC.83.014311⟩. ⟨in2p3-00570283⟩

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