Effects of velocity-dependent and spin-orbit terms of the Skyrme interaction on non-locality parameter of microscopic optical potentials
Vol. 135 No. 1B (2026), Original Article
Vol. 135 No. 1B (2026)

Effects of velocity-dependent and spin-orbit terms of the Skyrme interaction on non-locality parameter of microscopic optical potentials

Original Article
https://doi.org/10.26459/hueunijns.v135i1B.8422
Published 2026-06-26
Tam Do Quang
Faculty of Physics, University of Education, Hue University, Vietnam
T. D. Quynh Nhu
Faculty of Basic Sciences, University of Medicine and Pharmacy, Hue University, Vietnam
N. N. Bao Nguyen
Faculty of Physics, University of Education, Hue University, Vietnam
P. Hai Dang
Center for Theoretical and Computational Physics, University of Education, Hue University, Vietnam
P. N. Son Hung
Center for Theoretical and Computational Physics, University of Education, Hue University, Vietnam
H. Thai Hieu
Faculty of Physics, University of Education, Hue University, Vietnam
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Keywords

non-locality parameter
microscopic optical potential
neutron elastic scattering
Skyrme interaction
velocity-dependent and spin–orbit terms

How to Cite

1.
Do Quang T, Tran DQN, Nguyen NBN, Phan HD, Pham Nguyen SH, Hoang TH. Effects of velocity-dependent and spin-orbit terms of the Skyrme interaction on non-locality parameter of microscopic optical potentials. hueuni-jns [Internet]. 2026Jun.26 [cited 2026Oct.1];135(1B):113-27. Available from: http://222.255.146.83/index.php/hujos-ns/article/view/8422
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Abstract

We investigate how the velocity-dependent (t1 and t2) and spin-orbit (W0) terms of the Skyrme effective interaction influence the non-locality parameter β of the microscopic optical potential (MOP) for neutron elastic scattering off the doubly closed-shell nuclei 16O, 40Ca, 48Ca, and 208Pb at incident energies below 20 MeV. The MOP is constructed within the particle-vibration coupling framework on top of self-consistent Hartree-Fock plus random-phase approximation calculations by using the SLy5 parametrisation. Three calculation schemes are compared: the full Skyrme interaction, the interaction without t1 and t2, and the interaction without W0 in the residual interaction. The velocity-dependent terms exert a pronounced and mass-dependent influence on β: removing them increases βv by 0.27 fm for 16O but decreases it by 0.50 fm for 208Pb. The spin-orbit term, by contrast, produces much weaker modifications, typically below 0.1 fm. The extracted β values lie in the range 0.70–1.43 fm, with most values exceeding the widely adopted Perey-Buck value of 0.85 fm, suggesting that this empirical parameter underestimates the true microscopic non-locality for most nuclei.

https://doi.org/10.26459/hueunijns.v135i1B.8422
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