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Reduction of the Spin-Orbit Splittings at theN=28Shell Closure

L. Gaudefroy, O. Sorlin, D. Beaumel, Y. Blumenfeld, Z. Dombrádi, S. Fortier, S. Franchoo, M. Gélin, J. Gibelin, S. Grévy, F. Hammache, F. Ibrahim (+20 others)
2006 Physical Review Letters  
The N 28 shell closure has been investigated via the 46 Ard; p 47 Ar transfer reaction in inverse kinematics. Energies and spectroscopic factors of the neutron p 3=2 , p 1=2 , and f 5=2 states in 47 Ar were determined and compared to those of the 49 Ca isotone. We deduced a reduction of the N 28 gap by 330(90) keV and spin-orbit weakenings of ' 102 and 45(10)% for the f and p states, respectively. Such large variations for the f and p spin-orbit splittings could be accounted for by the
more » ... for by the proton-neutron tensor force and by the density dependence of the spin-orbit interaction, respectively. This contrasts with the picture of the spin-orbit interaction as a surface term only.
doi:10.1103/physrevlett.97.092501 pmid:17026356 fatcat:h4urg2j7lzhbpla2viua5ltj6e