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Published December 1, 1983 | public
Journal Article Open

Determination of the 2p-1s transition energy and strong interaction shift in pionic hydrogen using crystal diffraction


The 2p-1s atomic transition in pionic hydrogen has been studied with the help of a point-focusing graphite diffraction spectrometer. The transition energy was measured to be E(2p-1s)=2433.5±1.7 eV. From this result a strong interaction shift of -3.9±1.7 eV was derived. The Kα x-ray yield in the 2.7 atm hydrogen target at 40 K was found to be 0.025±0.013 per stopped pion.

Additional Information

©1983 The American Physical Society. Received 29 July 1983. Thanks are due to the staff of LAMPF for generous technical support and assistance. The help of J. Markey during the experiment is gratefully acknowledged. One of us (A.F.) wishes to thank Alexander von Humboldt Foundation for financial support. This work was supported by the US DOE under Contract No. DEAT-0381-ER40002.


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