Evaporation residue excitation function measurements in Ti50- and Cr54-induced reactions with lanthanide targets Academic Article uri icon

abstract

  • ©2015 American Physical Society. Cross sections for the production of shell-stabilized evaporation residues in the Ti50+Gd160, Tb159, Dy162, and Cr54+Dy162 reactions are reported. The compound nucleus excitation energy range considered principally covers the 4n evaporation channel with segments of the 3n and 5n channels also measured. The resultant production cross sections are for nuclides with Z=86-90. From an analysis based on a statistical model, it is concluded that a larger fission probability than that predicted by the Bohr-Wheeler transition-state theory is needed to describe the data. This outcome is attributed to the influence of collective nuclear excitations. Subsequently, the expected stability enhancement against fission due to the influence of the magic N=126 shell is not evident. The xn excitation functions measured in previous experiments in the reactions Ca48+Gd154, Tb159,Dy162, and Ho165 are combined with the present data for Z>20 projectiles to illustrate systematic behavior of measured cross sections as a function of the difference in fission barrier and neutron separation energy.

author list (cited authors)

  • Mayorov, D. A., Werke, T. A., Alfonso, M. C., Tereshatov, E. E., Bennett, M. E., Frey, M. M., & Folden, C. M.

citation count

  • 12

publication date

  • November 2015