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¹⁰He has not been observed when ²³²Th has been bombarded with 145 MeV ¹⁵N ions (1971AR21), nor in the spontaneous fission of ²⁵²Cf (1967CO36). See also (1966PO09). 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 (1972TH13). See also (1966GA25, 1972GA1F). See also (1968CE01, 1973KO1D) and (1969BA55, 1970RY03, 1970RY04, 1971LO13; theor.).