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GENERAL: See (83AJ01) and Table 20.27 [Table of Energy Levels] (in PDF or PS).

(WA81O, AN83D, BR83E, AN85E, HA85W, RO85N, AN86U, GA86N).

1. 20Na(β+)20Ne

Qm = 13.887

²⁰Na decays by positron emission to ²⁰Ne*(1.63) and to a number of other excited states of ²⁰Ne: see Table 20.26 (in PDF or PS) and reaction 53 in ²⁰Ne. The half-life of ²⁰Na is 447.9 ± 2.3 msec [weighted mean of values quoted in (78AJ03) and in (CL83)]; J^π = 2⁺: see (78AJ03). See also (HO86T).

2. 19F(p, π-)20Na

Qm = -140.608

Angular distributions and A_y have been studied at E_{pol. p} = 199.6 MeV to ²⁰Na*(0.74, 1.85, 3.01, 4.11) [probably unresolved]: it is suggested that the latter two have J = 6 or 7 (CA87).

3. 19Ne(p, γ)20Na

Qm = 2.199

(LA86C) have calculated the reaction rates at stellar energies. They are higher than those previously estimated. The higher rate implies a greater production of intermediate A elements in the r-p process in stellar evolution. See also (LA87G).

4. 20Ne(p, n)20Na

Qm = -14.670

For observed neutron groups see Tables 20.40 (in PDF or PS) in (78AJ03) and 20.27 (in PDF or PS) here. For preliminary work at E_p = 120 MeV see (DE83C). See also (BA86K) and (KN83C; theor.).

5. 20Ne(3He, t)20Na

Qm = -13.906

States derived from triton groups listed in Tables 20.40 (in PDF or PS) in (78AJ03) and 20.27 (in PDF or PS) here: see, in particular, (LA87G). [I am grateful to Professor M. Wiescher for communicating these results to me].

6. 20Mg(β+)20Na

Qm = 10.731

²⁰Mg decays to ²⁰Na*(6.57 ± 0.05) [J^π = 0⁺; T = 2]. That state decays by proton emission: see ²⁰Mg.

7. 27Al(20Ne, 27Mg)20Na

Qm = -16.498

The Δ resonance is very strongly excited in this reaction at E(²⁰Ne) = 950 MeV/A (BA86K).