The fission fragment mass distributions have been measured in the reactions ${}^{16}\mathrm{O}+{}^{184}\mathrm{W}$ and ${}^{19}\mathrm{F}+{}^{181}\mathrm{Ta}$ populating the same compound nucleus ${{}^{200}\mathrm{Pb}}^{*}$ at similar excitation energies. It is found that the widths of the mass distributions increase monotonically with excitation energy, indicating the absence of quasifission for both reactions. This is contrary to two recent claims of the presence of quasifission in the above-mentioned reactions.

• Received 8 April 2016
• Revised 14 July 2016

DOI:https://doi.org/10.1103/PhysRevC.94.024617