Evolution of the nuclear spin-orbit splitting explored via the 32Si(d,p)33Si reaction using SOLARIS

J. Chen, B.p. Kay, C.r. Hoffman, T.l. Tang, I.a. Tolstukhin, D. Bazin, R.s. Lubna, Y. Ayyad, S. Beceiro-Novo, B.j. Coombes, S.j. Freeman, L.p. Gaffney, R. Garg, H. Jayatissa, A.n. Kuchera, P. Macgregor, A.j. Mitchell, W. Mittig, B. Monteagudo, A. Munoz-RamosC. Müller-Gatermann, F. Recchia, N. Rijal, C. Santamaria, M.z. Serikow, D.k. Sharp, J. Smith, J.k. Stecenko, G.l. Wilson, A.h. Wuosmaa, C.x. Yuan, J.c. Zamora, Y.n. Zhang

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The spin-orbit splitting between neutron 1p orbitals at 33Si has been deduced using the single-neutron-adding (d,p) reaction in inverse kinematics with a beam of 32Si, a long-lived radioisotope. Reaction products were analyzed by the newly implemented SOLARIS spectrometer at the reaccelerated-beam facility at the National Superconducting Cyclotron Laboratory. The measurements show reasonable agreement with shell-model calculations that incorporate modern cross-shell interactions, but they contradict the prediction of proton density depletion based on relativistic mean-field theory. The evolution of the neutron 1p-shell orbitals is systematically studied using the present and existing data in the isotonic chains of 𝑁 = 17, 19, and 21. In each case, a smooth decrease in the separation of the - orbitals is seen as the respective p-orbitals approach zero binding, suggesting that the finite nuclear potential strongly influences the evolution of nuclear structure in this region.
Original languageEnglish
Article number138678
JournalPhysics Letters B
Early online date29 Apr 2024
Publication statusPublished - 1 Jun 2024


  • Spin-orbital splitting
  • Transfer reaction
  • Single-particle energies
  • Shell model


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