Evidence for New Isotopes of Element 107:B266handB267h

New neutron rich isotopes ${}_{107}^{267}\mathrm{Bh}$ and ${}_{107}^{266}\mathrm{Bh}$ were produced in bombardments of a ${}^{249}\mathrm{Bk}$ target with 117-MeV and 123-MeV ${}^{22}\mathrm{Ne}$ ions at the Lawrence Berkeley National Laboratory 88-Inch Cyclotron. Identification was made by observation of correlated $\alpha$-particle decays between the Bh isotopes and their Db and Lr daughters using a rotating wheel system. ${}^{267}\mathrm{Bh}$ was produced with a cross section of $\approx 70$ pb and decays with a ${17}_{-6\mathrm{}}^{+14\mathrm{}}$ s half life by emission of $\alpha$ particles with an average energy of $8.83\pm 0.03$ MeV. One atom of ${}^{266}\mathrm{Bh}$ was observed, decaying within 1 s by emission of a 9.29-MeV $\alpha$ particle.