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GENERAL: See also (72AJ02) and Table 20.39 [Table of Energy Levels] (in PDF or PS).

(HA73J, SU73D, HA74K, CH76D, SH77I).

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 20.37 (in PDF or PS). The half-life of ²⁰Na is 442 ± 5 msec (GO71F, WI71F), 446 ± 8 msec (MO72A), 448 ± 4 msec (TO73C): the weighted mean of these measurements is 446 ± 3 msec. The character of the β⁺ decay sets J^π = 2⁺ for the ground state of ²⁰Na. J = 2 is confirmed also by the work of (SC75M) who studied the asymmetry in the β⁺ decay of polarized ²⁰Na nuclei to detect r.f. transitions between h.f.s. Zeeman levels of the atomic ground state [see the "GENERAL" section here]. See also reaction 58 in ²⁰Ne.

2. 20Ne(p, n)20Na

Qm = -14.669

Observed neutron groups at E_p = 22.9 MeV are displayed in Table 20.40 (in PDF or PS) (MO71L). See also (BA72GG) and (72AJ02).

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

Qm = -13.906

At E(³He) = 32 MeV, triton groups are observed to nine states of ²⁰Na: see Table 20.40 (in PDF or PS) (DO65, PE65).

4. 24Mg(3He, 7Li)20Na

Qm = -20.751

See (BE76T).