دراسة نظرية للخواص النووية للانوية السوجية - السوجية 198 - 208Po و200 - 210Rn و218 - 228Ra و218 - 228Th و226 - 236U ا بسثعمال انموذج البوزونات المتفاعلة بنسختيه IBM - 1 وIBM - 2 == Theoretical Study for the Nuclear Properties of the even - even 198 - 208Po,200 - 210Rn,218 - 228Ra, 218 - 228Th,226 - 236U by using the Interacting Boson Model IBM - 1 , IBM - 2
Author name:
علي فاخر حبيب
Supervisor name:
عبد الرضا حسين صبر
General topic:
Physics
Specific topic:
Nuclear and Environmental Physics
Degree:
Master
University:
University Of Basrah - College Of Education For Pure Sciences
Language:
Arabic
University location:
Basrah
First pages:
26T1685 - p.pdf
Abstract:
This work aims to study the details the nuclear structure of selected heavy nuclei 198 - 208Po ,200 - 210Rn, 218 - 228Ra, 218 - 218 - 228Th and 226 - 236U, due to the important of nuclear structure of these nuclei in applied nuclear physics. In this study two IBM version have been used, IBM - 1 and IBM - 2. The versions of model used to described the ground band, quizi - beta and quadruple reduced transition probability B(E2) for selected transition. Also, the IBM - 2 version has been used to calculate the magnetic reduce transition probability B(M1) and mixing ratio for group transition emitted from ground band, quazi - beta and quazi - gamma band . the mixed symmetry states and the effect of majorana parameters of the energy of these state have been studied extensively .the potential energy surface of each isotope has been produced as contour lines using the output of IBM - 1.From the result calculation it is found that there is an agreement between the available experimental data and the calculated results of both IBM - 1 and IBM - 2 . The agreement concerns the energies of ground band and less in the beta and gamma band for 198 - 208Po isotopes. Also we have agood agreement in values of B(E2) and B(M1) from the results of the two version. It is noticed that all the studied isotopes are belong to the vibrational U(5) limit.The result of 200 - 210Rn isotopes show closed to the vibrational U(5) moving toward the O(6) . the calculated values are very closed the experimental data for the positive parity states of the ground, beta and gamma bands with increasing of energy value near the closed shell.The variable position of 218 - 228Ra isotopes between the three limits of IBM - 1 ((SU(3), O(6), U(5)) ,where is; these isotopes moving towards rotational away from the closed shell . We notice the excellent agreement between calculated values and available experimental data for energy level and other nuclear properties. The value of E41/E21 for 218 - 228Th isotopes decreases with moving away from the closed shell, in the same time; the values of level energies decreases also. The agreement between the experimental and calculated values of energy level is very clear for energy level and B(E2) and B(M1) values.All studied 226 - 236U are belong to the rotational SU(3) limit and both versions of the model succeed in producing such limit and found agood agreement for all the bands specially the IBM - 2. It is found that the change in the Majorana parameter FS has an effect on the energy of the mixed symmetry state in studies isotopes . The B(E2) values also calculated and compared with experimental data.In the comparison between all the studied nuclei it is found that systematic of energy level of single nucleus and all isotopes it is found that the energy of the first excited state is different for such isotope and also the ratio of E41/E21 found to be moving toward rotational limit with increase of atomic number. In the present work we found that the ratio N/Z is always agree when we used different isotopes in the studied nuclei
