Abstract
Using on-line mass separation of evaporation residues from the reaction58Ni +92Mo→150Yb*, a proton line of 1,055±6 keV energy and 0.42±0.10 s half-life was observed at mass number 147. The origin of this activity is very likely the direct proton decay of147Tm. Beta-delayed protons registered at the same mass position show a pronounced peak structure in their energy distribution. A lower limit of their half-life was set to 1 s.
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On leave of absence from Institute of Experimental Physics, University of Warsaw, PL-00-681 Warsaw, Poland
The authors are indebted to Dr. G. Münzenberg, Dr. P. Tidemand-Petersson and Prof. E.F. Zganjar for their assistance in the measurements and to C. Bruske, K.H. Burkard and W. Hüller for their help in operating the on-line mass separator. The excellent collaboration with the target-laboratory and the UNILAC crew is gratefully acknowledged.
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Klepper, O., Batsch, T., Hofmann, S. et al. Direct and beta-delayed proton decay of very neutron-deficient rare-earth isotopes produced in the reaction58Ni+92Mo. Z Physik A 305, 125–130 (1982). https://doi.org/10.1007/BF01415019
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DOI: https://doi.org/10.1007/BF01415019