Reduction of the Spin-Orbit Splittings at theN = 28 Shell Closure
Physical Review Letters(2006)
摘要
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 p(3/2), p(1/2), and f(5/2) 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 approximately 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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关键词
the<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml,display=inline><mmlmi>n</mmlmi><mmlmo>=</mmlmo><mmlmn>28</mmlmn></mmlmath>shell closure,spin-orbit
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