First measurement of the x-ray emission of σ-atoms by means of a crystal-diffraction spectrometer
Gur'ev M. P. , Denisov A. S. , Zhelamkov A. V. , Ivanov Yu. M. , Levchenko P. M., Malakhov V. D. , Petrunin A. A., Platonov Yu. P., Sergeev A. G. , Smirnov A. I., Suvorov V. M. , Fedin O. L.
The intensity and energy of the 5g-4/ transition of the 1~-nC atom have been measured by a crystal-diffraction spectrometer with a Cauchois layout at the proton synchrotron of the Institute of High-Energy Physics. The mass of the Σ~ hyperon was found to be 1197.417± 0.040 MeV/c2. This figure is in excellent agreement with the value found from studies of hyperon decays, while it is slightly at odds with a BNL experiment on heavy Σ" atoms. There is a promising outlook for studying Σ~ atoms by the crystal-diffraction method, in which a target is bombarded by a beam of high-energy protons.
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![](/ps/1180/article_17801_800_head.png "The intensity and energy of the 5g-4/ transition of the <i>1~-<sup>n</sup>C </i>atom have been measured by a crystal-diffraction spectrometer with a Cauchois layout at the proton synchrotron of the Institute of High-Energy Physics. The mass of the <i>Σ~ </i>hyperon was found to be 1197.417± 0.040 MeV/c<sup>2</sup>. This figure is in excellent agreement with the value found from studies of hyperon decays, while it is slightly at odds with a BNL experiment on heavy Σ" atoms. There is a promising outlook for studying Σ~ atoms by the crystal-diffraction method, in which a target is bombarded by a beam of high-energy protons.")