Comparison of complementary reactions for the production of Bh261,262
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Two heavy-ion induced fusion reactions producing Bh261,262 were studied using the Berkeley Gas-filled Separator at the Lawrence Berkeley National Laboratory 88-Inch Cyclotron. An excitation function for the production of Bh262 via the reaction 209Bi(54Cr,n)262Bh was measured with a maximum cross section from a fit to the data of 430 Â± 110 pb observed at a compound nucleus excitation energy of 15.7 MeV. New data have been measured for the 1n exit channel of the 208Pb(55Mn, n)262Bh reaction. We present an updated excitation function with an observed maximum cross section of 530Â±100 pb at a compound nucleus excitation energy of 14.1 MeV. Events corresponding to the 2n exit channel for the 209Bi(54Cr,2n)261Bh and 208Pb(55Mn,2n)261Bh reactions were also observed and are presented as partial excitation functions. The measured decay properties correspond well with existing experimental data. We compare these experimental results to cross section predictions from a model by Świa,tecki and discuss entrance channel effects on the magnitude of 1n cross sections. © 2008 The American Physical Society.
author list (cited authors)
Nelson, S. L., Folden, C. M., Gregorich, K. E., Dragojević, I., Düllmann, C. E., Eichler, R., ... Nitsche, H.