Levels in 106Ru and 108Ru

Level structure of106Mo

“…This value is in good agreement with the value of 20 ~ which was used for a fit of the levels of l~ [13] and which Faessler et al [16] Here, it has been assumed that the M1 fraction of the 25 --* 2[ transition is small as is predicted by the model. The experimental value of R is considerably larger than the rigid rotor value of 1.4.…”

“…It is similar to the values that have been found for asymmetric rotors at A ~ 170. It is therefore expected that 1~ has a non-zero value for the deformation parameter 7 similar to the situation in neighbouring nuclei like 1~ [4] and I~ [13].…”

Nuclear structure effects in the mass region aroundA=100, derived from experimentalQ ? -values

“…from that of a~ here, the /~-branches with the strongest intensities populate excited levels in ~~ with energies above 2.2 MeV [14], cf. the partial decay scheme shown in Fig.…”

“…Kurieplot with calculated fit of a fl-ray spectrum measured in coincidence with the 2239 keV 7-transition in l~ (background spectrum subtracted). The partial level scheme shown as an insert is taken from [14] with N>60) seem to be correlated much stronger than in other parts of the nuclear chart. The transition from shell closure (sphericity) to deformation, for isotopes of the same element differing only by few neutrons, is easily observed for example in a plot of the two-neutron separation energies S(2n) as a function of neutron number N, as will be shown in a later section.…”

The collective structure of106,108Ru

“…The aim of the present investigation is to extend this information on the nuclei 106, lOSRu ' i.e., towards the middle of the N= 50-82 neutron shell, where in analogy to higher shells maximum deformation is expected. The level schemes of lo6, lO8Ru have previously been investigated [3] by measuring 77 coincidences of the 7-radiation following the fl-decay of 36 s 1~ and 5 s 1~…”