QC338 : Clustering Phenomenon in Nuclear Matter and the Study of Light Alpha-Conjugate Nuclei using Cluster Approach
Thesis > Central Library of Shahrood University > Physics > PhD > 2016
Authors:
Niloufar Zoghi [Author], Mohammad Reza Shojaee [Supervisor], Ali Akbar Rajabi[Advisor]
Abstarct: When one uses Shell Model to study the even-even nuclei, he faces more complexities compared to other nuclei. In cluster model, physicists consider a few basic assumptions to simplify the problem and provide a good dynamical descxription of quantum systems of Alpha-Conjugate nuclei. In general, the basic and most important parameter which can affect the clustering phenomenon in nuclei is the energy of the quantum system. In other words, in each of the light Alpha-Conjugate nuclei, depending on the amount of the energy of system, one can expect a variety of structural changes from a cluster perspective, all of which lead to structures that are similar to molecular structures in these nuclei. These changes start from a structure consisting of an alpha particle and a smaller nucleus and eventually end in a structure consisting of several alpha clusters. The main purpose of this research is to obtain an appropriate model in a non-microscopic approach to study the clustering phenomenon in light Alpha-Conjugate Nuclei. In this research, at first a suitable equation of state for nuclear matter has been provided; then the clustering phenomenon in nuclei has been explained. After that, taking into account the localization parameter relationship in finite nucleonic systems, the range of potential well's depth for clustering phenomenon in each of the light Alpha-Conjugate nuclei intended in this research has been determined. Additionally, the time interval related to clustering phenomenon in these nuclei is studied. Besides, with regard to quasi-molecular structure model for clustered nuclei, the variation of the clustering energy versus the number of alpha bonds in light Alpha-Conjugate Nuclei has been investigated; It has also been demonstrated that the cluster-cluster interaction is similar to the nucleon-nucleon interaction, and has a saturable nature. Finally, two suitable potentials for interaction between Alpha clusters has been assumed, then for the first time the cluster model for non-microscopic computational analysis of clustering phenomenon has been utilized in 8Be ,12C ,16O and 20Ne nuclei as two, three, four and five alpha clusters respectively.
Keywords:
#Nuclear matter #Clustering phenomenon #Cluster-Cluster interaction #Clustering energy Link
Keeping place: Central Library of Shahrood University
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