Evolution of the Nuclear Spin-orbit Splitting Explored via the 32Si(d,p)33Si Reaction Using SOLARIS

Authors

• J. Chen, Southern University of Science and Technology
• B. P. Kay, Argonne National Laboratory
• C. R. Hoffman, Argonne National Laboratory
• T. L. Tang, Argonne National Laboratory
• I. A. Tolstukhin, Argonne National Laboratory
• D. Bazin, Michigan State University
• R. S. Lubna, Michigan State University
• Y. Ayyad, Instituto Galego de Física de Altas Enerxías (IGFAE)
• S. Beceiro-Novo, Michigan State University
• B. J. Coombes, The Australian National University
• S. J. Freeman, The University of Manchester
• L. P. Gaffney, University of Liverpool
• R. Garg, Michigan State University
• H. Jayatissa, Argonne National Laboratory
• A. N. Kuchera, Davidson College
• P. MacGregor, The University of Manchester
• A. J. Mitchell, The Australian National University
• W. Mittig, Michigan State University
• B. Monteagudo, Michigan State University
• A. Munoz-Ramos, Instituto Galego de Física de Altas Enerxías (IGFAE)

Document Type

Article

Publication Date

6-1-2024

Publication Source

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

Volume Number

853

ISSN

03702693

Article Number

138678

Abstract

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 1p3/2-1p1/2 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.

Keywords

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

Recommended Citation

Published in: Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, Volume 853, June 1, 2024.