1. Evolution of the nuclear spin-orbit splitting explored via the $^{32}$Si($d$,$p$)$^{33}$Si reaction using SOLARIS
- Author
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Chen, J., Kay, B. P., Hoffman, C. R., Tang, T. L., Tolstukhin, I. A., Bazin, D., Lubna, R. S., Ayyad, Y., Beceiro-Novo, S., Coombes, B. J., Freeman, S. J., Gaffney, L. P., Garg, R., Jayatissa, H., Kuchera, A. N., MacGregor, P., Mitchell, A. J., Mittig, W., Monteagudo, B., Munoz-Ramos, A., Müller-Gatermann, C., Recchia, F., Rijal, N., Santamaria, C., Serikow, M. Z., Sharp, D. K., Smith, J., Stecenko, J. K., Wilson, G. L., Wuosmaa, A. H., Yuan, C. X., Zamora, J. C., and Zhang, Y. N.
- Subjects
Nuclear Experiment - Abstract
The spin-orbit splitting between neutron 1$p$ orbitals at $^{33}$Si has been deduced using the single-neutron-adding ($d$,$p$) reaction in inverse kinematics with a beam of $^{32}$Si, 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 1$p$-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 $1p_{3/2}$-$1p_{1/2}$ 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., Comment: 10 pages, 5 figures
- Published
- 2024