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9He (1984AJ01)(Not illustrated)
9He has been observed in the 9Be(π-, π+)9He reaction at Eπ- = 194 MeV; the atomic mass excess is 40.81 ± 0.12 MeV. 9He is then unstable with respect to decay into 8He + n by 1.14 MeV (1980NA1D, 1980SE1C, 1980SEZX, 1981SEZR). See also (1979AJ01) and (1982PO1C; hypernuclei) and (1982NG01; theor.).
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