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Evidence for New Isotopes of Element 107: B 266 h and B 267 h

Wilk, P. A.; Gregorich, K. E.; Türler, A.; Laue, C. A.; Eichler, R.; Ninov, V.; Adams, J. L.; Kirbach, U. W.; Lane, M. R.; Lee, D. M.; Patin, J. B.; Shaughnessy, D. A.; Strellis, D. A.; Nitsche, H.; Hoffman, D. C.

New neutron rich isotopes 107267Bh and 107266Bh were produced in bombardments of a 249Bk target with 117-MeV and 123-MeV 22Ne ions at the Lawrence Berkeley National Laboratory 88-Inch Cyclotron. Identification was made by observation of correlated α-particle decays between the Bh isotopes and their Db and Lr daughters using a rotating wheel system. 267Bh was produced with a cross section of ≈70 pb and decays with a 17−6+14 s half life by emission of α particles with an average energy of 8.83±0.03 MeV. One atom of 266Bh was observed, decaying within 1 s by emission of a 9.29-MeV α particle.

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