Elsevier

Nuclear Physics A

Volume 392, Issues 2–3, 10–17 January 1983, Pages 297-310
Nuclear Physics A

Measurements on exotic atoms of helium

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Abstract

Measurements of X-ray yields, energies and strong interaction effects have been made for muonic, pionic, kaonic, antiprotonic and sigma-helium atoms. The strong interaction measurements for kaons confirm the discrepancy previously reported between experiment and values calculated with an optical model. However, in contradiction to previous work there is good agreement between theory and experimental measurements of strong interaction effects in antiprotonic-helium. The first observation of X-rays from sigma-helium atoms is reported.

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    Citation Excerpt :

    The X-ray events were selected using this timing information, to obtain a good signal-to-background ratio in the energy spectra of kaonic atom X-rays without reducing their statistics [7,10]. Combined with the results of the shift values determined in [7], the correlations of the shift and width values of the kaonic 3He and 4He 2p states are plotted in Fig. 5, together with the average value reported in [1,2], where the error bars were calculated by adding the statistical and systematic errors quadratically. Clearly, the new results gave significantly smaller values both for the shift and width.

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Present address: CERN, Geneva 23, Switzerland.

∗∗

Present address: Royal Greenwich Observatory, Herstmonceux, Sussex, BN27 1RP, England.

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