High-K quasiparticle structures in 159Er and 160Er

Structure changes inEr160from low to ultrahigh spin

“…1 were previously observed and reported in Ref. [23], but were not linked to the main level scheme. In the present work, two tentative linking transitions have been observed at 901 and 764 keV, the former can be seen in Fig.…”

“…The strongly coupled sequence, band 7 and 8, was observed previously [23] (labeled band 3 in this previous work) and was interpreted at low rotational frequency as the AE ⊗ A p E p (F p ) configuration. The alignment plot of Fig.…”

“…Therefore, an I π of 13 + and 14 + is tentatively assigned to the bandheads of bands 7 and 8, respectively. Two other strongly coupled bands were also reported in [23]. One of these was connected to the yrast band at low spin and the other was a higher spin "floating" structure.…”

“…Previous work has exposed a wide variety of rotational and vibrational bands [21][22][23] in this nucleus and its yrast structure has been observed up to ∼ 50h [24,25]. The present article reports on the observation of new rotational bands and extensions to existing structures and discusses these in the framework of the cranked shell model.…”

“…The strongly-coupled signature-partner bands observed in 160 Er have previously been discussed in terms of being based on multi-quasiparticle excitations involving the πh 11/2 [523]7/2 and πg 7/2 [404]7/2 configurations [23]. The assignments made were strengthened through the ratios of the reduced transition probabilities B(M 1)/B(E2), which can be deduced from measured (I→ I − 1) to (I→ I − 2) branching ratios.…”