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Evolution of the $N=28$ shell closure: a test bench for nuclear forces

O. Sorlin 1 M.-G. Porquet 2
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : The evolution of the $N=28$ shell closure is investigated far from stability. Using the latest results obtained from various experimental techniques, we discuss the main properties of the $N=28$ isotones, as well as those of the $N=27$ and $N=29$ isotones. Experimental results are confronted to various theoretical predictions. These studies pinpoint the effects of several terms of the nucleon-nucleon interaction, such as the central, the spin-orbit, the tensor and the three-body force components, to account for the modification of the $N=28$ shell gap and spin-orbit splittings. Analogies between the evolution of the $N=28$ shell closure and other magic numbers originating from the spin-orbit interaction are proposed ($N=14,50, 82$ and $90$). More generally, questions related to the evolution of nuclear forces towards the drip-line, in bubble nuclei, and for nuclei involved in the r-process nucleosynthesis are proposed and discussed.
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Submitted on : Friday, September 14, 2012 - 10:20:50 AM
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O. Sorlin, M.-G. Porquet. Evolution of the $N=28$ shell closure: a test bench for nuclear forces. Nobel Symposium: Physics with Radioactive Beams, 2012, Göteborg, Sweden. pp.014003, ⟨10.1088/0031-8949/2013/T152/014003⟩. ⟨in2p3-00732159⟩



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