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Experimental study of the two-body spin-orbit force

Abstract : Energies and spectroscopic factors of the first $7/2^-$, $3/2^-$, $1/2^-$ and $5/2^-$ states in the $^{35}$Si$_{21}$ nucleus were determined by means of the (d,p) transfer reaction in inverse kinematics at GANIL using the MUST2 and EXOGAM detectors. By comparing the spectroscopic information on the $^{35}$Si and $^{37}$S isotones, a reduction of the $p_{3/2} - p_{1/2}$ spin-orbit splitting by about 25\% is proposed, while the $f_{7/2} -f_{5/2}$ spin-orbit splitting seems to remain constant. These features, derived after having unfolded nuclear correlations using shell model calculations, have been attributed to the properties of the 2-body spin-orbit interaction, the amplitude of which is derived for the first time in an atomic nucleus. The present results, remarkably well reproduced by using several realistic nucleon-nucleon forces, provide a unique touchstone for the modeling of the spin-orbit interaction in atomic nuclei.
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Submitted on : Tuesday, January 7, 2014 - 3:00:52 PM
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G. Burgunder, O. Sorlin, F. Nowacki, S. Giron, F. Hammache, et al.. Experimental study of the two-body spin-orbit force. Physical Review Letters, American Physical Society, 2014, 112, pp.042502. ⟨10.1103/PhysRevLett.112.042502⟩. ⟨in2p3-00925064⟩



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