학술논문
Experimental study of the two-body spin-orbit force
Document Type
Working Paper
Author
Burgunder, G.; Sorlin, O.; Nowacki, F.; Giron, S.; Hammache, F.; Moukaddam, M.; eville, N. De S er; Beaumel, D.; aceres, L. C; ément, E. Cl; Duchêne, G.; Ebran, J. P.; Fernandez-Dominguez, B.; Flavigny, F.; Franchoo, S.; Gibelin, J.; Gillibert, A.; évy, S. Gr; Guillot, J.; Lapoux, V.; Lepailleur, A.; Matea, I.; Matta, A.; Nalpas, L.; Obertelli, A.; Otsuka, T.; Pancin, J.; Poves, A.; Raabe, R.; Scarpaci, J. A.; Stefan, I.; Stodel, C.; Suzuki, T.; Thomas, J. C.
Source
Subject
Language
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.
Comment: 5 pages, 3 figures, accepted for publication in Physical Review Letters
Comment: 5 pages, 3 figures, accepted for publication in Physical Review Letters