Nuclear Spin of ^249Bk from the Hyperfine Structure in its Emission Spectrum*

Elements Beyond 100, Present Status and Future Prospects

“…The first observations of the spectral lines of einsteinium (160) and berkelium (161), of the radioluminescence spectrum of einsteinium (162), and of the absorption spectrum of Bk a + (163,164), BkH (163), Cf a + (165,166), and Es a + (167) in solution have been re ported. In more recent work the nuclear spins of 249Bk (168) and 253Es (169), both 7/2, have been determined from their hyperfine structure. The work by Cunningham and co-workers at Berkeley with einsteinium includes the first isolation of this element (as a pure compound), in visible quantities.…”