High-spin states inNb96,97

Abstract

The high-spin level structures of the 96,97 Nb isotopes have been studied. The isotopes were produced in the fission of the compound systems formed in two heavy-ion-induced reactions, 24 Mg (134.5 MeV) + 173 Yb and 23 Na (129 MeV) + 176 Yb. Gamma-ray spectroscopy was accomplished with the Gammasphere array. High-spin states are observed for the first time in both isotopes with excitation energies up to 5.2 and 6.6 MeV in 96,97 Nb, respectively. The coupling of the odd proton occupying the g 9/2 orbital to the yrast states in the subshell closure nucleus of 96 Zr can account for the first excited states of 97 Nb. A comparison with the first excited states in 95 Zr is also attempted. The addition of a neutron hole in 96 Nb results in a much more fragmented level scheme.

States built on the 10+isomers in118,120,122,124Sn

“…Such methods have been used several times to collect information on high-spin states of stable nuclei or nuclei near the line of stability (see, for instance, Ref. [12]). 118,120,122,124 Sn can be populated as fission fragments in such reactions and the structure above their isomers can be studied by establishing γ-ray coincidences between transitions feeding the isomers and previously known transitions in the complementary fission fragments.…”

Shell-model Study of Two-neutrino Double-Beta Decay for Z = 40–50 Nuclei and their SSD Properties

“…Thus, the calculated results for 100 intermediate states are believed to be well converged. For the nuclei 94 Nb, 96 Nb, and 98 Tc, no 1 + states are known experimentally and their ground states have large angular momentum [43,44], so the calculated energies are used. Thies et al 2012 suggest that the lowest 1 + state of 96 Nb could be 694.6keV [45], so 694.6 keV is adopted.…”