Abstract
There are three experiments in the history of this subject up to the Santa Fe Conference (1975) which might be taken as benchmarks from which to view the many results of the past two years, (i) There is the measurement in 1950 with a pair spectrometer by Panofsky et al. 1) of what is now called the Panofsky ratio, which opened the field of radiative pion capture. In the past year this ratio was measured with Nal crystals for 1H, 2H, 3He, and 6Li with highest accuracy and a new level of sensitivity to rare π0, s. (ii) In 1970 there was the measurement of 12C(π-, γ) 12B by Crowe et al. 2) which showed sharp lines in the photon spectrum near 125 MeV and thereby demonstrated nuclear structure sensitivity. In the past two years the spectroscopy of high energy photons was pushed to 0. 9 MeV (FWHM) and applied to nuclei from throughout the periodic table with many new levels resolved. Moreover, high resolution γ spectra in coincidence with 2p → 1s pionic X-rays were obtained.
Work supported in part by US ERDA and by the NSF.
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Baer, H.W. (1977). Radiative Pion Capture and Charged Photo-Pion Production in the Threshold Region. In: Locher, M.P. (eds) Seventh International Conference on High-Energy Physics and Nuclear Structure . Experientia Supplementum, vol 31. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-5918-9_23
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