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GENERAL: References to articles on general properties of ¹⁰He published since the previous review (1988AJ01) are grouped into categories and listed, along with brief descriptions of each item, in the General Tables for ¹⁰He located on our website at (nucldata.tunl.duke.edu/nucldata/General_Tables/10he.shtml).

See also 10.1 [Table of Energy Levels] (in PDF or PS).

1. 1H(11Li, 2p)10He

Qm = -15.302

¹⁰He has been observed in quasifree proton-knockout reaction with 83 MeV/A ¹¹Li incident on targets of CH₂ (1997KO07). The preliminary value determined for the decay energy for ¹⁰He → ⁸He + 2n is 1.7 ± 0.3(stat.) ± 0.3(syst.) MeV.

2. 2H(11Li, 3He)10He

Qm = -9.808

Reaction products from 61 MeV/A ¹¹Li incident on targets of CD₂ and C were studied in experiments described in (1994KO16, 1995KO27). The transfer reaction ²H(¹¹Li, ³He)¹⁰He as well as the final state interaction of particles ⁸He + n + n emitted in fragmentation were considered. Invariant-mass measurements for ⁸He + n + n coincidences were used. Evidence was obtained for a ¹⁰He resonance at 1.2 ± 0.3 MeV above the ⁸He + n + n threshold with a width Γ ≤ 1.2 MeV.

3. 10Be(14C, 14O)10He

Qm = -41.191

The double charge-exchange reaction ¹⁰Be(¹⁴C, ¹⁴O)¹⁰He was studied at E_lab = 334.4 MeV (1994OS04, 1995BO10, 1999BO26). See also (1995OSZX, 1995VO05, 1996OS1A, 1998BO1M). The measured Q-value for the ¹⁰He ground state resonance is -41.19 ± 0.07 MeV which corresponds to a mass excess of 48.81 ± 0.07 MeV. This is also the value adopted in (2003AU03). ¹⁰He is then particle unstable against 2n emission by 1.07 ± 0.07 MeV. The measured width of the ground state resonance is Γ = 0.3 ± 0.2 MeV. Excited states are reported at E_x = 3.24 ± 0.20 MeV, Γ = 1.0 ± 0.3 MeV and E_x = 6.80 ± 0.07 MeV, Γ = 0.6 ± 0.3 MeV. Widths of the two excited-state resonances are described using R-matrix calculations by (1994OS04). See 10.2 (in PDF or PS).