The main parameters and technical features of the PrimEx experiment conducting in Jefferson Lab (USA) are presented. One of the main parts of the PrimEx setup-electromagnetic calorimeter is described in details. Value of π~0 meson decay width into two γ-quanta, obtained from PrimEx 2004 year data is Γ(π~o → 2γ) = 7.82 eV 2.2% (stat.) 2.1% (syst.)
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机译：介绍了在美国杰斐逊实验室进行的PrimEx实验的主要参数和技术特征。详细介绍了PrimEx设置电磁热量计的主要部分之一。从PrimEx 2004年数据获得的π〜0介子衰变宽度变成两个γ量子的值是Γ（π〜o→2γ）= 7.82 eV 2.2％（stat。）2.1％（syst。）
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