Evidence for New Isotopes of Element 107: B266h and B267h

P. A. Wilk, K. E. Gregorich, A. Türler, C. A. Laue, R. Eichler, V. Ninov, J. L. Adams, U. W. Kirbach, M. R. Lane, D. M. Lee, J. B. Patin, D. A. Shaughnessy, D. A. Strellis, H. Nitsche, and D. C. Hoffman
Phys. Rev. Lett. 85, 2697 – Published 25 September 2000
PDFExport Citation

Abstract

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 176+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.

  • Received 23 February 2000

DOI:https://doi.org/10.1103/PhysRevLett.85.2697

©2000 American Physical Society

Authors & Affiliations

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

References (Subscription Required)

Click to Expand
Issue

Vol. 85, Iss. 13 — 25 September 2000

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×