Decay modes of 250No
Peterson, D. · Back, B. B. · Janssens, R. V. F. · Khoo, T. L. · Lister, C. J. · Seweryniak, D. · Ahmad, I. · Carpenter, M. P. · Davids, C. N. · Hecht, A. A. · Jiang, C. L. · Lauritsen, T. · Wang, X. · Zhu, S. · Kondev, F. G. · Heinz, A. · Qian, J. · Winkler, R. · Chowdhury, P. · Tandel, S. K. · Tandel, U. S.
الأصل · EN
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-x)No 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+1.1-0.8 us and 43+22-15 us) 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 alpha branch was observed, resulting in upper limits of 2.1% for the shorter lifetime and 3.4% for the longer activity.
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