Direct proton decay of 0.56-s147Tm and search for this decay mode among very neutron-deficient isotopes with 53≦Z≦67 |
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Authors: | P. O. Larsson T. Batsch R. Kirchner O. Klepper W. Kurcewicz E. Roeckl D. Schardt W. F. Feix G. Nyman P. Tidemand-Petersson |
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Affiliation: | 1. GSI Darmstadt, Germany 3. Institut für Kernphysik, Technische Hochschule Darmstadt, Germany 4. Department of Physics, Chalmers University of Technology, G?teborg, Sweden 5. II. Physikalisches Institut, Universit?t G?ttingen, Germany
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Abstract: | The earlier preliminary assignment of a 1,055±6 keV proton line to direct proton decay of147Tm is supported by cross bombardment measurements and by a negative result from a positron-proton coincidence experiment. The half-life was remeasured to be 0.56 ±0.04s. For two types of thermal ion sources, overall efficiencies were estimated for on-line mass separation of known short-lived isotopes of promethium, europium, terbium, and holmium. Direct proton decay was searched for among very neutron-deficient isotopes of these elements, and of iodine and caesium. No evidence for direct proton decay was found. Based on estimated overall efficiencies, on calculated cross-sections, and on predictions from the gross-theory ofβ decay, half-life limits for direct proton decay were deduced. |
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