ON PROBABILITIES OF E2 TRANSITIONS BETWEEN POSITIVE-PARITY STATES IN 160 Dy NUCLEUS
Reduced probabilities B(E2) of transitions between states of positive parity in the 160 Dy nucleus are calculated within the framework of the interacting boson model (IBM-1). The results are compared with the experimental data. Thorough and comprehensive investigations of the 160 Er ! 160m,g Ho ! 160 Dy decay have yielded new extensive experimental data on excited states and transitions between them in the 160 Dy nucleus [1]. In particular, observation of over 100 new levels and over 500 new transitions is reported and about 150 multipolarities are said to be established for the first time. The 160m,g Ho ! 160 Dy decay scheme proposed by the authors includes practically all known and newly discovered transitions except few of them whose total intensity is 0.9% of decays. In [2] we made an attempt to describe theoretically energy positions of most excited states of positive parity and to reproduce energies of levels belonging to ground rotational, gamma, and other rotational bands manifesting themselves in this nucleus. In this paper, using our data [1] on intensities and energies of transitions de-exciting positive-parity levels with known T1/2 [3], we found experimental values of reduced probabilities B(E2) by the formula