Abstract
Theα-branching ratios (b α ) of192,190,188Pb are measured using mass-separated sources. Different experimental set-ups are used — one detector as well as two detector set-ups — thereby detecting theα particles from the parent and/or viaα decay formed daughter nuclei, theβ-delayed gamma radiation from the parent and/or viaβ decay formed daughter nuclei and the Tl KX rays from electron capture decay. Values forb α of 6.2(6) 10−5 and 4.0(4) 10-3 were found for192,190Pb respectively. For188Pb, limits on theb α values were obtained: 0.03<b α <0.10. A careful analysis of the previously reportedb α values showed that the discrepancies in theb α values were not due to inadequate correction procedures, as was suggested, but to experimental uncertainties in the efficiency determination of the different detection set-ups and to an unreliableβ-decay scheme for188Pb. Theb α obtained in this work show that the leadα decay is not faster than the Hgα decay and that there is no need to assume a disappearance of theZ=82 shell closure halfway betweenN=82 andN=126.
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The authors would like to thank the crew of the CYCLONE cyclotron in Louvain-la-Neuve for the excellent beams, J. Gentens and P. Vandenberghe for operating the LISOL separator, and C. Bruske, K. Burkard and W. Hüller for running the G.S.I. on-line mass separator.
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Wauters, J., Dendooven, P., Decrock, P. et al. The alpha-branching ratios of the188,190,192Pb isotopes. Z. Physik A - Hadrons and Nuclei 342, 277–282 (1992). https://doi.org/10.1007/BF01291510
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DOI: https://doi.org/10.1007/BF01291510