Spin assignment and behavior of superdeformed bands in A\\sim 150 mass region

Authors : Ali KHALAF, Manal SIRAG, Mahmoud TAHA

Pages : 49-62

Doi:10.3906/kim-1212-76

View : 20 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The smoothed experimental dynamical moment of inertia Jinsert ignore into journalissuearticles values(2); values were fitted with a theoretical version using the Harris three parameter formula in even powers of angular frequency w, derived for results from the cranking model. The expansion parameters were adjusted by using a computer simulated search program. The best expansion parameters from the fit were used to assign the spins of the superdeformed insert ignore into journalissuearticles values(SD); rotational bands insert ignore into journalissuearticles values(RB); by integrating the calculated Jinsert ignore into journalissuearticles values(2);. The data set includes 23 RB`s in 11 SD nuclei, which show no evidence of either irregular behavior near the bottom of the bands or abrupt angular momentum at low rotational frequency in the mass region ranging from A = 142 to A = 154. We used the differences of angular momenta at constant frequency as effective alignment. The relative properties of superdeformed rotational bands insert ignore into journalissuearticles values(SDRB`s); are analyzed in terms of the effective alignment of the valence nucleons. The effective alignment is a powerful tool to assign the configurations, to select the identical bands as well as to predict new SD bands from other combination of the orbitals. The D I = 2 energy staggering observed in 3 of our selected SDRB`s are also described from a smooth reference representing the finite difference approximation to the fourth derivative of the g-ray transition energies.
Keywords : Superdeformed rotational bands, nuclear effective alignment, identical bands, nuclear staggering