The decay of174Ta

Abstract

Abstract. Levels in t74Hf excited in the decay of ~V4Ta have been studied. Measurements of gamma-rays, conversion electrons and gamma-gamma-time coincidences were performed. The ground state band, the beta-vibrational band, the gamma-vibrational band with its head at 1226.81keV, a K=3 + band at 1303.42keV and a K=2-octupole band at 1308.67 keV were observed. Several 2 + levels with K -0 are excited. The main fl+-branches proceed through allowed or first-forbidden transitions to the 2 + and 4 + levels of the ground state band. The character of the I" = 3 ~ +) ground state of 174Ta is discussed. E Radioactivity 174Ta I-from 175Lu(3He, 4n)

Enhanced mixing of intrinsic states in deformed Hf nuclei

“…174 Hf has been studied previously in significant detail in four different β-decay experiments [24][25][26][27]. The present experiment finds mostly agreement with the literature data on 174 Hf.…”

Level structure of170Er observed in the decay of the 2.76 min170Ho

“…This can be seen in Figure 3b, where the y-ray branching ratios of the I217.5 and 1304.5 keV states are compared with those of the 1303(3 + ) and 1394keV(4 +) K=3 states in 174Hf [17]. Similar K = 3 + bands are observed also in some other neighbours of lV~ (e.g.…”

“…a Comparison between the experimental gamma ray branching ratios of the proposed gamma band (in front of the parentheses) and the theoretical ones calculated with the projection model (after parentheses) [14]. The experimental values observed in 168Er [16] and lV4Hf [17] are given inside the parentheses, b Experimental branching ratios of the K'= 3 + band compared with the corresponding results in 174Hf [17]. e Experimental branching ratios of the K'=4 -band compared with the results in ~68Er [16] [ 14,15] produces the gamma band (K=2) with energies 932keV (2+), 1014keV (3+), l123keV (4+), 1258 keV (5 +) and 1416keV (6+).…”

“…For example, the c~K-value of the 103.54 keV gamma ray was obtained from the spectrum gated by the 258. 17 181.57 keV transitions, but without setting any restrictions for the multipolarities of other gamma rays coincident with the 258.17 keV transition (multipole orders higher than M2 were, however, neglected due to their slowness). The results are given in Table 3 together with theoretical values for various multipolarities calculated by Hager and Seltzer [8].…”

“…The comparison between the observed gamma ray branching ratios and the theoretical ones given in Figure 3a supports strongly all of these assignments. The experimental branching ratios of the gamma bands in two neighbouring even-even nuclei ~168F.. 174T4r ~ [16,17] are given for t, 68~1100~ 72~x~1021…”