Pionic and muonic X-ray transitions in liquid helium |
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Authors: | G. Backenstoss J. Egger T. von Egidy R. Hagelberg C.J. Herrlander H. Koch H.P. Povel A. Schwitter L. Tauscher |
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Affiliation: | 1. CERN, Geneva, Switzerland;2. Institut für Experimentelle Kernphysik der Universität und des Kernforschungszentrums, Karlsruhe, Germany;3. Research Institute for Physics, Stockholm, Sweden |
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Abstract: | Energies and intensities of pionic and muonic X-rays in liquid 4He have been measured with a Si (Li) detector. The energy shift due to strong interaction effects of the pionic 1s level in 4He was determined to be ?75.7±2.0 eV. The natural line width of this level is 45±3 eV. These values are compared with different theoretical predictions. Cascade calculations, including external Auger effect and sliding transitions, have been performed to reproduce the yields of the muonic and pionic transitions. The pionic 2p level width is deduced: . |
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