Shell structure evolution in isotopes (even Z and even N) of Silicon (Si), Sulphur (S), Argon (Ar) and Calcium (Ca) has been analysed. We have used both Relativistic Hartree-Bogoliubov theory and Non-Relativistic Hartree-Fock-Bogoliubov theory for the theoretical calculations of the physical observables of interest. We have employed the model based on Relativistic Hartree-Bogoliubov theory with the density dependent effective interactions of meson exchange and point coupling types. Calculations based on Hartree-Fock-Bogoliubov theory are carried out with different skyrme forces and their sensitivity has been tested. Physical observables of interest include binding energies, single neutron separation energies, two-neutron separation energies, shell closure parameter $D_n$(Z, N) and differential variation $d{S}_{2n}$(Z, N) based on two neutron separation energy. Our theoretical results gives indication of shell closure at neutron number N =14 and neutron number N = 20 for the nuclei of Silicon (Si). Shell closures at neutron numbers N = 14, 20 and neutron number N = 28 are observed for Sulphur (S) nuclides. Argon (Ar) and Calcium (Ca) isotopes also provides the signature of shell closures at neutron numbers N = 20 and neutron number N = 28.

分析了硅（Si），硫（S），氩（Ar）和钙（Ca）的同位素（甚至Z和N）的壳结构演化。我们已经使用相对论的Hartree-Bogoliubov理论和非相对论的Hartree-Fock-Bogoliubov理论来进行感兴趣的物理观测值的理论计算。我们采用了基于相对论Hartree-Bogoliubov理论的模型，该模型具有介子交换和点耦合类型的密度相关有效相互作用。基于Hartree-Fock-Bogoliubov理论的计算是在不同的Skyrme力下进行的，并且已经测试了它们的敏感性。感兴趣的物理可观察物包括束缚能，单中子分离能，二中子分离能，壳封闭参数$d_{ñ}$（Z，N）和微分变化 $d{\mathrm{小号}}_{2ñ}$（Z，N）基于两个中子分离能。我们的理论结果表明，对于硅（Si）原子核，在中子数N = 14且中子数N = 20时壳层闭合。对于硫（S）核素，观察到中子数N = 14、20和中子数N = 28的壳封闭。氩（Ar）和钙（Ca）同位素还提供了中子数N = 20和中子数N = 28时壳封闭的特征。