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¹⁰He has not been observed when ²³²Th has been bombarded with 145 MeV ¹⁵N ions (AR71H), nor in the spontaneous fission of ²⁵²Cf (CO67A). See also (PO66H). It is particle unstable: the calculated (M - A) = 52.75 MeV. The breakup energies into ⁹He + n and ⁸He + 2n are calculated to be -1.1 and -4.9 MeV, respectively (TH72K). See also (GA66C, GA72Q).

See also (CE68A, KO73F) and (BA69NN, RY70B, LO71E, RY71; theor.).