Phys. Rev. Lett. 85, 2697 - 2700 (2000)Evidence for New Isotopes of Element 107: 266Bh and 267Bh |
PRL Celebrates 50 Years
This Week's Milestone Letters are from 1984: |
P. A. Wilk1,2, K. E. Gregorich1, A. Türler3, C. A. Laue1, R. Eichler3,4, V. Ninov1, J. L. Adams1,2, U. W. Kirbach1, M. R. Lane1,2, D. M. Lee1, J. B. Patin1,2, D. A. Shaughnessy1,2, D. A. Strellis1,5, H. Nitsche1,2, and D. C. Hoffman1,2
1Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
2Department of Chemistry, University of California, Berkeley, California 94720-1460
3Paul Scherrer Institut, CH-5232 Villigen, Switzerland
4Department of Chemistry and Biochemistry, University of Bern, CH-3012 Bern, Switzerland
5Department of Nuclear Engineering, University of California, Berkeley, California 94720-1730
Received 23 February 2000
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.
©2000 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v85/p2697
DOI: 10.1103/PhysRevLett.85.2697
PACS: 27.90.+b, 23.60.+e, 25.70.Gh
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