Abstract

An experimental search is conducted for the formation of the heavy ⁹He isotope of helium upon the absorption of stopped pions by ¹⁴C nuclei. The structure of ⁹He levels in the missing mass spectra in reactions ¹⁴C(π^–, p⁴He)Х and ¹⁴C(π^–, d³He)Х is studied. A state with a high energy of excitation of 12.5 MeV and a state width of 1.5 MeV is detected for the first time. Suppression of the formation of ground state ⁹He in the considered reactions is established.

中文翻译：

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在14 C核吸收停止的离子后搜索9 He

摘要

进行了实验性搜索，以了解¹⁴ C原子核吸收停止的离子后氦的重⁹ He同位素的形成。结构^9个在缺少质谱他水平反应¹⁴ C（π ^- ，p ⁴赫）Х和¹⁴ C（π ^- ，d ³赫）Х进行了研究。首次检测到具有12.5 MeV的高激发能和1.5 MeV的状态宽度的状态。建立了在考虑的反应中抑制基态⁹ He的形成。