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New isotope 264Sg and decay properties of 262-264Sg

  • Author(s): Gregorich, K.E.
  • Gates, J.M.
  • Duellmann, Ch.E.
  • Sudowe, R.
  • Nelson, S.L.
  • Garcia, M.A.
  • Dragojevic, I.
  • Folden, C.M. III.
  • Neumann, S.H.
  • Hoffman, D.C.
  • Nitsche, H.
  • et al.
Abstract

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.

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