Evidence for new isotopes of element 107: (266)Bh and (267)Bh

Authors
Wilk, PA Gregorich, KE Turler, A Laue, CA Eichler, R Ninov, V Adams, JL Kirbach, UW Lane, MR Lee, DM Patin, JB Shaughnessy, DA Strellis, DA Nitsche, H Hoffman, DC
Citation
Pa. Wilk et al., Evidence for new isotopes of element 107: (266)Bh and (267)Bh, PHYS REV L, 85(13), 2000, pp. 2697-2700
Citations number
19
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
85
Issue
13
Year of publication
2000
Pages
2697 - 2700
Database
ISI
SICI code
0031-9007(20000925)85:13<2697:EFNIOE>2.0.ZU;2-N
Abstract
New neutron rich istotopes (267)(107)Bh and (266)(107)Bh were produced in b ombardments of a Bk-249 target with 117-MeV and 123-MeV Ne-22 ions at the L awrence Berkeley :National Laboratory 88-Inch Cyclotron. Identification was made by observation of correlated alpha-particle decays between the Ph iso topes and their Db and Lr daughters using a rotating wheel system. (267)Bh was produced with a cross section of approximate to 70 pb and decays with a 17(-6)(+14) s half life by emission of alpha z particles with an average e nergy of 8.83 +/- 0.03 MeV. One atom of (266)Bh was observed, decaying with in 1 s by emission of a 9.29-MeV alpha particle.