Experimental study of the two-body spin-orbit force

G. Burgunder; O. Sorlin; F. Nowacki; S. Giron; F. Hammache; M. Moukaddam; N. De S er eville; D. Beaumel; L. C aceres; E. Cl ément; G. Duchêne; J. P. Ebran; B. Fernandez-Dominguez; F. Flavigny; S. Franchoo; J. Gibelin; A. Gillibert; S. Gr évy; J. Guillot; V. Lapoux; A. Lepailleur; I. Matea; A. Matta; L. Nalpas; A. Obertelli; T. Otsuka; J. Pancin; A. Poves; R. Raabe; J. A. Scarpaci; I. Stefan; C. Stodel; T. Suzuki; J. C. Thomas

doi:10.1103/physrevlett.112.042502

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arXiv · 1401.1593

Experimental study of the two-body spin-orbit force

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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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G. Burgunder, O. Sorlin, F. Nowacki, S. Giron, F. Hammache, M. Moukaddam, N. De S er eville, D. Beaumel, L. C aceres, E. Cl ément, G. Duchêne, J. P. Ebran, B. Fernandez-Dominguez, F. Flavigny, S. Franchoo, J. Gibelin, A. Gillibert, S. Gr évy, J. Guillot, V. Lapoux, A. Lepailleur, I. Matea, A. Matta, L. Nalpas, A. Obertelli, T. Otsuka, J. Pancin, A. Poves, R. Raabe, J. A. Scarpaci, I. Stefan, C. Stodel, T. Suzuki, J. C. Thomas. 2014-01-08. Experimental study of the two-body spin-orbit force. https://doi.org/10.1103/physrevlett.112.042502

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