Abstract

The formation of the unbound heavy helium isotopes \({}^{7,9}\)He was studied in the reactions of stopped pion absorption by light nuclei. Measurements were carried out using two-arm multilayer semiconductor spectrometer. The data on the level structures obtained in different reaction channels are consistent with each other. Our results on the energies and widths of the low-lying states of the \({}^{7,9}\)He are consistent with the world data. Record values of resonance energies were obtained for highly excited states of \({}^{7}\)He (24.5 MeV) and\({}^{9}\)He (10.5 MeV).

中文翻译：

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未结合重氦同位素的能级结构 $${}^{{7,9}}$$ He

摘要

未结合的重氦同位素的形成\({}^{7,9}\)他在轻核停止π介子吸收的反应中进行了研究。使用两臂多层半导体光谱仪进行测量。不同反应通道中获得的能级结构数据是一致的。我们对\({}^{7,9}\) He低洼态的能量和宽度的结果与世界数据一致。在\({}^{7}\) He (24.5 MeV) 和\({}^{9}\) He (10.5 MeV)的高激发态获得了共振能量的记录值。