Pionic and muonic X-rays.

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Pionic and muonic X-rays.

The first run with a hydrogen target will concentrate on the measurement of the $3\rightarrow 1$ transition at two different pressures. We plan a total beam time of 10 weeks presumably for the year 2000. The experiment has to be set up in the $\pi E5$ area and requires the full intensity of the proton beam of 1.5 mA with the full thickness of the pion production target E.

The running in period of 3 weeks before the hydrogen measurement should be used to perform the necessary calibration measurements with pionic atoms as mentioned in chapter 4.2. It will need a special target in order to provide a maximum number of detected X-rays.
1 week should be devoted to verify the pressure independence of the pionic and muonic $3\rightarrow 1$ transition energies as mentioned in chapter 4.3. Also in this case a special target different from the one mentioned above is required in order to allow a simultaneous measurement on hydrogen and oxygen/nitrogen gas at cryogenic temperatures.
6 weeks are planned to measure the strong interaction width at two pressures between $15bar$ and $40bar$ .

The second run period should be devoted to the $2\rightarrow 1$ transition. A total beam time of two months is planned for the year 2001 with a preparatory phase of two weeks and two periodes of three weeks for two pressures between $15bar$ and $40bar$ .

A third run of two months is planned for the year 2002 for a measurement at lower pressures. Depending on the date of the scheduling and termination of the X-ray measurement with the ECR source the pion/muon measurements are planned to start in the years 1999/2000 and will last for about three years.

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Pionic Hydrogen Collaboration
1998