학술논문
Evolution of the nuclear spin-orbit splitting explored via the $^{32}$Si($d$,$p$)$^{33}$Si reaction using SOLARIS
Document Type
Working Paper
Author
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.; Zhang, Y. N.
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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
Comment: 10 pages, 5 figures