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Phys. Rev. C 74, 014316 (2006) [9 pages]

Decay modes of 250No

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D. Peterson, B. B. Back, R. V. F. Janssens, T. L. Khoo, C. J. Lister, D. Seweryniak, I. Ahmad, M. P. Carpenter, C. N. Davids, A. A. Hecht*, C. L. Jiang, T. Lauritsen, X. Wang†, and S. Zhu
Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

F. G. Kondev
Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

A. Heinz, J. Qian, and R. Winkler
A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511, USA

P. Chowdhury, S. K. Tandel, and U. S. Tandel
Department of Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA

Received 7 April 2006; published 28 July 2006

The fragment mass analyzer at the ATLAS facility has been used to unambiguously identify the mass number associated with different decay modes of the nobelium isotopes produced via 204Pb(48Ca,xn)252-xNo reactions. Isotopically pure (>99.7%) 204Pb targets were used to reduce background from more favored reactions on heavier lead isotopes. Two spontaneous fission half-lives (t1/2=3.7-0.8+1.1 and 43-15+22 μs) were deduced from a total of 158 fission events. Both decays originate from 250No rather than from neighboring isotopes as previously suggested. The longer activity most likely corresponds to a K isomer in this nucleus. No conclusive evidence for an α branch was observed, resulting in upper limits of 2.1% for the shorter lifetime and 3.4% for the longer activity.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.74.014316
DOI:
10.1103/PhysRevC.74.014316
PACS:
21.10.Tg, 27.90.+b, 25.60.Pj

*Also Department of Chemistry, University of Maryland, College Park, Maryland 20742, USA

†Also Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA

 
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