Study of band structures and crossings in 180Os

Isomeric states in180Os

“…The previously known K ~ = 7-isomer [6,7] with an excitation energy of 1928 keV has been confirmed, and from the analysis of the tx_b~ spectra of the 324.4 and 361.4 keV transitions a half-life of T~/2 = 26 + 3 ns was measured in agreement with previous results [6,7]. In Fig.…”

“…In Fig. Also the 7-member of the previously known ( -, 1)3 band [6,7] at 1862 keV was found to be isomeric. Also the 7-member of the previously known ( -, 1)3 band [6,7] at 1862 keV was found to be isomeric.…”

“…This was quite unexpected since from the large difference of K-quantum numbers between these states one would expect a partial half-life which is orders of magnitude larger than observed. In order to get more information about the deexcitation of high-K isomers, we have studied the neighbouring even-even nucleus ~S~ In this nucleus a low-K isomer with K ~ = 7-at 1928 keV has previously been established [6,7]. The small hindrance factor of the 1062 keV transition in 182Os is not fully understood as yet.…”

Study of band structures and crossings in179Re

“…In Fig. 3 it can be seen that the dependence of the rotational parameter (Er-E~_ 1)/21 on 2I 2 is similar for band 2 in 179Re and the 7-bands in lvsW [11] and 18~ [12]. It is, therefore, reasonable to assume that the quasiparticles involved in these 7-bands, viz.…”

“…It is, therefore, reasonable to assume that the quasiparticles involved in these 7-bands, viz. The experimental g~ factor has been determined from the branching ratios of AI = 1 and AI = 2 transitions deexciting the same levels of band 2 using the equations given in [12]. A value of g~V = 0.69 -+ 0.15 has been obtained using Qo=6.0+__0.5b and gR=0.30_+0.05 [13,14].…”