Elsevier

Nuclear Physics A

Volume 326, Issues 2–3, 10 September 1979, Pages 455-462
Nuclear Physics A

Measurement of kaonic and pionic X-rays from liquid helium

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Abstract

The strong interaction widths, shifts and relative intensities have been measured for the last observed X-ray transitions in kaonic and pionic helium. The effect of the strong interaction on the 2p level in kaonic helium was much larger than anticipated from optical-model calculations. The energy shift of the 2p level was determined to be −35±12eV and the natural line width 30±30eV, whereas optical-model calculations predicted a shift and width of approximately 0.1 eV and 2.0 eV, respectively.

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Present address: EP Division, CERN, Geneva.

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