Abstract
We study the nearest neighbor spacing distribution of energy levels of even even nuclei classified according to their reduced electric quadrupole transition probability B(E2)up arrow using the available experimental data. We compare between Brody, and Abul-Magd distributions that extract the degree of chaoticity within nuclear dynamics. The results show that Abul-Magd parameter f can represents the chaotic behavior in more acceptable way than Brody, especially if a statistically significant study is desired. A smooth transition from chaos to order is observed as B(E2)f increases. An apparent regularity was located at the second interval, namely: at 0.05 <= B(E2) < 0.1 in e(2)b(2) units, and at 10 <= B(E2) < 15 in Weisskopf unit. Finally, the chaotic behavior parameterized in terms of B(E2)up arrow f does not depend on the unit used. (C) 2015 Elsevier B.V. All rights reserved.