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Journal Articles Physical Review Letters Year : 2006

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

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Z. Dombrádi
  • Function : Author
J. Gibelin
K. W. Kemper
  • Function : Author
K.-L. Kratz
  • Function : Author
S. M. Lukyanov
  • Function : Author
F. Nowacki
A. N. Ostrowski
  • Function : Author
T. Otsuka
  • Function : Author
Yu.-E. Penionzhkevich
  • Function : Author
J. Piekarewicz
  • Function : Author
J. A. Scarpaci
D. Sohler
M. Stanoiu
  • Function : Author
T. Suzuki
  • Function : Author

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.

Dates and versions

in2p3-00090839 , version 1 (04-09-2006)

Identifiers

Cite

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, 2006, 97, pp.092501. ⟨10.1103/PhysRevLett.97.092501⟩. ⟨in2p3-00090839⟩
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