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

Abstract : The N=28 shell closure has been investigated via the 46Ar(d,p)47Ar transfer reaction in inverse kinematics. Energies and spectroscopic factors of the neutron p3/2, p1/2, and f5/2 states in 47Ar were determined and compared to those of the 49Ca isotone. We deduced a reduction of the N=28 gap by 330(90) keV and spin-orbit weakenings of ~=10(2) 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 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.
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Contributor : Michel Lion <>
Submitted on : Monday, September 4, 2006 - 9:47:41 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:32 PM

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L. Gaudefroy, O. Sorlin, D. Beaumel, Y. Blumenfeld, Z. Dombrádi, et al.. Reduction of the Spin-Orbit Splittings at the N=28 Shell Closure. Physical Review Letters, American Physical Society, 2006, 97, pp.092501. ⟨10.1103/PhysRevLett.97.092501⟩. ⟨in2p3-00090839⟩



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