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GENERAL: See 16.29 [General Table] (in PDF or PS) and 16.32 [Table of Energy Levels] (in PDF or PS).

Mass of ¹⁶Ne: The Q-values of the ²⁰Ne(α, ⁸He) and ¹⁶O(π⁺, π^-) reactions lead to atomic mass excesses of 23.93 ± 0.08 MeV (1978KE06), 23.978 ± 0.024 MeV (1983WO01) and 24.048 ± 0.045 MeV (1980BU15) [recalculated using the (1985WA02) masses for ⁸He, ¹⁶O and ²⁰Ne]. The weighted mean is 23.989 ± 0.020 MeV, which is also the (1985WA02) value. ¹⁶Ne is then bound with respect to decay into ¹⁵F + p by 0.07 MeV and unbound with respect to ¹⁴O + 2p by 1.40 MeV (1986AJ04).

1. 16O(π+, π-)16Ne

Qm = -24.77

For ground state cross sections and analyses for E_π⁺ = 80 to 292 MeV see (1982AJ01, 1986AJ04). A recent measurement at θ_lab = 5° for E_π⁺ = 140 - 292 MeV has been reported (1990SE11).

2. 20Ne(α, 8He)16Ne

Qm = -60.21

At E_α ≈ 117.5 MeV, ¹⁶Ne*(0, 1.69 ± 0.07) are populated, the former with a differential cross section of 5 ± 3 nb/sr at 8°(lab). The Γ_c.m. for the ground state group is 200 ± 100 keV; applying penetrability corrections leads to a total decay width of 5 - 100 keV. The di-proton branching ratio is 10 - 90%, with the most probable value being 20%. The cubic term, d, in the IMME (Isobaric Multiplet Mass Equation) is 8 ± 5 keV, 15 ± 6 keV based, respectively, on the masses of ¹⁶Ne*(0, 1.69). The first T = 2 states in ¹⁶F[0⁺, 2⁺] are predicted to lie at E_x = 10.08 ± 0.02 and 11.87 ± 0.03 MeV (1978KE06). At E_α = 129 MeV (1983WO01) find Γ_c.m. for ¹⁶Ne_g.s. = 110 ± 40 keV and the d and e coefficients in the IMME are both 4 ± 3 keV.