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Open Access Publications from the University of California

Scholarly Works (3 results)

  • Article
Lawrence Berkeley National Laboratory (2008)
    Cover page: Extraction systems for the study of dubnium
    • Article
    Lawrence Berkeley National Laboratory (2006)

    New isotope, 264Sg, was identified using the 38U(30Si,xn)268-xSg reaction and excitation functions for 262-264Sg were measured. 264Sg decays by spontaneous fission with a half life of 37 +27/-11 ms. The spontaneous fission branch for 0.9-s 263Sg was measured for the first time and found to be (13+-8) percent. 262Sg decays by spontaneous fission with a 15 +5/-3 ms half-life. Spontaneous fission partial half-life systematics are evaluated for even-even Sg isotopes from 258Sg through 266Sg, spanning the transition region between the N=152, Z=100 and N=162, Z=108 deformed shells.

      Cover page: New isotope 264Sg and decay properties of 262-264Sg
      • Article
      LBL Publications (2008)
      K-isomers occur in deformed, axially-symmetric nuclei, (where K is the projection of the total angular momentum on the symmetry axis). K-isomers have been observed in A~130 and A~180 regions. High-K states are also predicted to occur near A=250 in the deformed trans-fermium region. So far there has been relatively little structure information on nuclei in this region of the chart of nuclides due to small production cross sections. However, recent experiments have studied the decay of high-K isomers in 252,254No yielding important information on these multi-quasiparticle states. I will describe our recent identification of high-K isomeric states in 256Rf. Nuclei of interest were produced via the 208Pb(50Ti, 2n)256Rf reaction at the Lawrence Berkeley National Laboratory?s 88-Inch Cyclotron and the decay was studied at the focal plane of the Berkeley Gas-filled Separator (BGS).
        Cover page: Production and Investigation of K isomers in 256Rf
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