CALCULATION OF REDUCED TRANSITION PROBABILITIES B(E2) FOR ROTATIONAL EXCITED GROUND BAND STATES EVENEVEN NUCLEI IN LANTHANIDE AND ACTINIDE SERIES

Biniyam; N. Edae.; Chaubey; A. K.

Volume : VI, Issue : VII, July - 2017

CALCULATION OF REDUCED TRANSITION PROBABILITIES B(E2) FOR ROTATIONAL EXCITED GROUND BAND STATES EVENEVEN NUCLEI IN LANTHANIDE AND ACTINIDE SERIES

Biniyam, N. Edae. , Chaubey, A. K.

Abstract :

The measurement of B(E2) values of excited states in nuclei is one of the most active areas of nuclear structure physics. In this work the asymmetric rotor model of Davydov– Filippov (DF) has been employed to study the reduced transition probabilities in the rotational excited ground state band even–even nuclei of lanthanide and actinide series which comprises of 57 nuclides. These E2–transitions raging up to 12⁺ spin states transitions have been studied in detailed in the spectra of nuclei whose mass number ranges as 150<=A<=190 and A>=228, and for those the first excited state 2⁺ and the second excited state 2^+� gamma band energies are available. In data calculations experimental and theoretical methods have been used. The best input parameters for the above approaches have been determined. These input parameters includes the energy involved in the transition, the total internal conversion coefficient, the half–life of rotational excited states, the intrinsic quadrupole moment Qo and the nuclear asymmetric parameter γ. The reduced transition probability B(E2) for the above nuclei have been calculated by using the most recent available experimental data. Comparison of results of theoretical calculations with the corresponding experimental data shows a very good agreement, including high angular momentum states. Both the empirical and experimental B(E2) values usually increase with spin for low–lying states within a rotational ground state band. This work has determined particularly the B(E2) values for rotational excited states of which no report has been done so far. So this work has incorporated many nuclides and transitions for which neither experimental nor theoretical values are available.