Evidence for New Isotopes of Element 107: 266Bh and 267Bh
Abstract
New neutron rich isotopes 267107Bh and 266107Bh 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+14-6 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.
- Publication:
-
Physical Review Letters
- Pub Date:
- September 2000
- DOI:
- Bibcode:
- 2000PhRvL..85.2697W