Observation of identical superdeformed bands inN=86 nuclei

Structure of the highly deformed nucleus101Sr63 and evidence for identical K=3/2 bands

“…It is interesting to note that whenever identical bands are observed, the single-particle spectrum shows a deformed gap followed by a stronly down-sloping low-K orbital of highj origin [15]. This emphasizes the importance of the hn/2 neutron shell in the A~ 100 region.…”

“…Since our first report on identical bands [8], this topic has become a rapidly expanding field owing to the findings in superdeformed regions, first by Byrski et al [15] in the rare-earth region and Stephens et al [38] in the Hg region. Near-equality of transition energies in ground-state bands in adjacent nuclei has also been observed in the actinide region.…”

“…Another intriguing phenomenon is that the moments of inertia of the ground-state bands of the even-even isotopes 9SSr and l~176 when extracted from the unperturbed 6 + --+ 4 + --+ 2 + cascades, are equal within 1%, [8,9], although the A 5/3 scaling of the rigid-rotor expression would imply an increase of 3.3%. It is interesting in this context to note that the crossing of the Fermi surface by strongly up-or down-sloping orbitals has also been suggested as a possible explanation for the occurence of identical superdeformed bands in neighbouring nuclei in the Dysprosium region [15]. With respect to A 100 odd-mass nuclei, a better understanding of the structure is highly desirable in order to unambigously identify the low-lying Nilsson orbitals.…”

Superfluid liquid model with triplet pairing for superdeformed bands inA?130?150 region

“…The experimental data are taken from [23] for 15~ from [18] for 15~Tb (1) and from [21] can be found in Table 13 where we summarize our results of the A ,~ 150 mass region. In Table 6, one can find the application to bands 147Gd (2), 148Gd (1) [35] and to the two bands observed in 25~ [21,28] whereas Table 7 deals with the superdeformed bands in the odd Z Tb isotopes 150 and 151 [18,21,23]. The conclusions drawn for lS2Dy can practically all be extended to the data analysed in this subsection.…”

“…Same as for Table 5 but for different superdeformed bands observed in Gd isotopes. The experimental data are taken from [35] for 147Gd (2) and 148Gd (1), from [28] for ~5~ (1) and from [21] for lS~ (2) ~47Gd (2) ~48Gd (1) ~5~ (1) Table 8. Results for 136Nd.…”