Abstract
Rotational bands up to spin of ≈10h̵ have been studied in even-even and odd-A nuclei in the mass 100 region, by observing prompt γ-rays from the spontaneous fission of 248Cm. Transitions in the neutro-rich nuclei 103Zr, 104Zr, 107Mo and 108Mo have been observed for the first time, and evidence for a band in 105Nb is presented. Rotational bands are also reported in 98–100Sr, 99,101Y, 100–102Zr, 101,103Nb and 102–106Mo. In most cases these bands have been extended to much higher spins than previously known. The data on the even-even nuclei provide information on deformation trends in this region. The level structures of the odd-A nuclei indicates which Nilsson orbitals lie close to the Fermi level. Bands based on the 52+[422] and52−[303] configurations are identified in the odd-A nuclei with Z = 39 and 41. Evidence is presented that certain bands observed in N = 61 and 63 nuclei are built on the 52−[532] configuration, and the role of the neutron h112 orbital in stabilizing the deformation in this region is discussed.
Published Version
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