Decay modes of 250No
Abstract
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 (t_1/2 = 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.
Cite
@article{arxiv.nucl-ex/0604005,
title = {Decay modes of 250No},
author = {D. Peterson and B. B. Back and R. V. F. Janssens and T. L. Khoo and C. J. Lister and D. Seweryniak and I. Ahmad and M. P. Carpenter and C. N. Davids and A. A. Hecht and C. L. Jiang and T. Lauritsen and X. Wang and S. Zhu and F. G. Kondev and A. Heinz and J. Qian and R. Winkler and P. Chowdhury and S. K. Tandel and U. S. Tandel},
journal= {arXiv preprint arXiv:nucl-ex/0604005},
year = {2009}
}
Comments
RevTex4, 10 pages, 5 figures, submitted to PRC