Electromagnetic transition probabilities in the doubly odd N = 91 nucleus 154Eu

Low-lying excitations in the odd-odd nucleus154Eu

“…Almost all low-energy gamma rays connected with those isomers in previous papers [3,4] have been identified in the present study. Thus the results of these experiments largely confirm the earlier data, but many other, new gamma rays were also included in our level schemes as well.…”

“…The earlier, most comprehensive level scheme of t54Eu is that of Rotter et al in [4]. The partial schemes displayed in Figs.…”

“…For some placements the excitation energies and 77-coincidences tabulated in [-3, 5] are utilized. The spin assignments shown without parentheses refer to the values established previously [4], while the others are based on the observation of 7-ray cascades in our experiments. The suggestions made for these sequences are supported by the fact that no possible branchings through energetically favoured gamma rays have been identified in the present or previous experiments.…”

“…This together with the results of a previous 77-coincidence measurement in an (n, 7) study [3] has provided a firm basis for later investigations. A more recent series of measurements with the (n, 7)-and (d, p)-reactions summarized in [4,5] yielded a lot of additional information on individual lowenergy excitations in l S4Eu. In particular, the existence of several rotational structures has been suggested [5], but the interpretations are usually based at most only on two or three identified first states.…”

“…For example, the prompt coincidence data undoubtedly indicate the existence of a very regular ground band populated up to the spin value of (10-). Placings of the first-time observed transitions as well as the spin assignments tentatively suggested are entirely based on the established levels [3][4][5]. …”