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GENERAL: See also (82AJ01) and Table 16.26 [Table of Energy Levels] (in PDF or PS) here.

See (SE81I, AN83D, AN85E, MA85T).

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 (KE78C), 23.978 ± 0.024 MeV (WO83) and 24.048 ± 0.045 MeV (BU80B) [recalculated using the (WA85C) masses for ⁸He, ¹⁶O and ²⁰Ne]. The weighted mean is 23.989 ± 0.020 MeV which is also the (WA85C) 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.

1. 16O(π+, π-)16Ne

Qm = -24.77

Angular distributions to ¹⁶Ne_g.s. have been studied at E_π⁺ = 120 and 200 MeV (GI84B) and at 164 MeV (GR83C). For the ground state cross section for E_π⁺ = 80 to 292 MeV see (GR82, GR82A) and the analysis in (BL82F, GI84B, GI85E). See also (82AJ01, IN82, MO82E, BA84Q, WO85A).

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, b, in the IMME is 8 ± 5 keV, 15 ± d 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 (KE78C). At E_α = 129 MeV (WO83) 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.