Nuclear and Atomic Physics

2607 Submissions

[2] viXra:2607.0059 [pdf] submitted on 2026-07-13 21:40:13

Nuclear Shell Model Composed of Spin-coupled Dinucleon

Authors: Naili Cui
Comments: 6 Pages.

This paper constructs a Nuclear Shell Model composed of spin-coupled dinucleon nuclei. Using pn (proton-neutron) and nn (neutron-neutron) pairs formed by antiparallel spin coupling as the basic structural units of the atomic nucleus, a shell model isomorphic to the outer electron orbitals is established. By comparing the microscopic orbital configurations of various typical magic number nuclei, the formation of magic numbers is explained from the perspective of nuclear structure. This paper distinguishes between orbital shell configurations and the actual steady state of the atomic nucleus, thus resolving paradoxes that magic number models cannot explain, such as the instability of certain double magic number nuclei and the stability of isotopes in non-magic number nuclei. Research shows that a complete inner neutron cores is a necessary condition for maintaining the stable state of the atomic nucleus. Magic numbers merely represent the geometric characteristics of fully occupied orbitals and cannot be used as a standard for judging nuclear stability. This model can construct a unified nuclear shell system applicable to nuclei within the magic number range without the need for artificial fitting of empirical parameters, providing a new theoretical framework for studying nuclear structure and isotope stability.
Category: Nuclear and Atomic Physics

[1] viXra:2607.0053 [pdf] submitted on 2026-07-12 23:21:26

Electrohydrodynamic Wind Generation in Planar DBDs: Role of Electrode Symmetry and Geometry

Authors: Farshad Sohbatzadeh, Saeed Ranjbar Malekshah, Hamed Soltani Ahmadi, S. Mirzanejhad, Ramin Mehrabifard, Samira Mavvadati, Zdenko Machala
Comments: 19 Pages.

This study experimentally and numerically investigates the electrohydrodynamic (EHD) interaction induced by a surface dielectric barrier discharge (SDBD) actuator at atmospheric pressure. The EHD effect, driven by non-thermal plasma in a dielectric barrier discharge (DBD), generates ionic wind, which is characterized here for a symmetric annular-type DBD actuator. A symmetric annular-type DBD actuator, consisting of concentric ring—disk electrodes that generate a predominantly vertical ionic wind rather than a tangential jet. Despite extensive studies on linear and tangential SDBD actuators, the influence of annular electrode geometry on vertically induced ionic wind and associated ozone generation remains insufficiently explored. We analyze the induced wind velocity perpendicular to the electrode plane, focusing on the influence of geometric parameters—electrode diameter (D) and thickness (δ)—on performance. Experimental results reveal a maximum wind velocity of 3.42 m s−1 ± 1% for an optimized configuration (D = 32 mm, δ = 0.06 mm), corroborated by numerical simulations. The simulations further elucidate the velocity profile, volumetric force, electron temperature, and gas pressure distribution within the plasma region. Complementary diagnostics, including O3 concentration measurements and Schlieren imaging, demonstrate that larger electrode diameters (e.g., 32 mm and 22 mm) enhance vertical flow height but concurrently increase ozone production. These findings provide actionable insights for designing DBD-based systems in applications such as plasma flow control, air purification, and biomedical plasma technologies.
Category: Nuclear and Atomic Physics