• MOHAMMAD REZA SHOJAEI

      Articles written in Pramana – Journal of Physics

    • A new approach for cluster structures in $^{16}$O and $^{20}Ne$

      NILOUFAR ZOGHI-FOUMANI MOHAMMAD REZA SHOJAEI ALI AKBAR RAJABI

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      In this article, the cluster–cluster interaction between $\alpha$-clusters in $^{16}$O and $^{20}$Ne is studied theoretically. Using the generalized Nikiforov–Uvarov (NU) technique, the clusterization energy for these nuclei is calculated. Based on the obtained results, one can find out that the clustering phenomenon does not take place neither at the ground state, nor at the excited states of these nuclei and it is more probable at energies among excited levels. It is shown that the formulation presented for the clustering phenomenon reproduces the results obtained in previous experimental and theoretical attempts. It is worth mentioning that the consistency of the results with the previous experimental and theoretical predictions for clustering phenomenon in $^{16}$O and $^{20}$Ne indicates the reliability of this formulation for various types of light $\alpha$-conjugate nuclei, such as $^{8}$Be, $^{12}$C, $^{24}$Mg and so on.

    • Relativistic effects in the study of weakly bound $^{17}\rm{F}$ and $^{11}\rm{Be}$ nuclei

      FAHIME REZVANI MOHAMMAD REZA SHOJAEI

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      Relativistic effects are employed to describe the weakly bound nuclei of $^{17}\rm{F}$ and $^{11}\rm{Be}$. In order to calculate the energy levels of the ground state and the excited states of these nuclei, we solved the Dirac equation with pseudospin symmetry in the shell model by using the basic concept of supersymmetric shape invariance method. The results obtained from this approach are compared with a non-relativistic approach and experiment. It was then seen that the relativistic approach matches more with the experimental results.

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