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¹⁰He has not been observed in the bombardment of ²³²Th by 4.8 GeV/c deuterons [the production cross section is < / ~ 2 μb] (BE79II) nor in the interaction of ¹⁰B, ¹¹B and ²²Ne [8 to 10 MeV/A] with Ti and ²³²Th targets [the cross section is < 5 x 10^-4 μb/sr] (OG82). See also (74AJ01). The calculated value of the atomic mass excess of ¹⁰He is 49.40 MeV: ¹⁰He is then unstable with respect to breakup into ⁹He + n and ⁸He + 2n by 0.52 and 1.66 MeV, respectively (SE80D). See also (79AJ01), (BO80T, BI82A) and (BO79GG, AV81B, KI81C, AV82A, NG82, VE82F; theor.).