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## 17Ne (1971AJ02)

(See the Isobar Diagram for 17Ne)

GENERAL: See also Table 17.22 [Table of Energy Levels] (in PDF or PS).

Theory: (1964WI1B, 1965MA16, 1966MA12).

Reviews: (1960BA1F, 1960GO1B, 1961BA1C, 1962GO31, 1964GO1G, 1966GO1B, 1966GO1K, 1966MC1C, 1968CE01, 1969GA1P).

Mass of 17Ne: M - A, determined from the Q-value of the 20Ne(3He, 6He)17Ne reaction, is 16.479 ± 0.050 MeV (1970ME11). See also (1967ES02). Then 17Ne - 17F = 14.53 MeV and Eb for p, 3He and α are, respectively, 1.50, 6.46 and 9.05 MeV. [Eb for an α-particle is calculated using the mass of (1970ME11) for 13O.] The mass of 17Ne predicted from mass formulae are M - A = 16.508 ± 0.023 MeV (1970ME11), 16.517 ± 0.026 MeV (1968CE01), 16.63 MeV (1966KE16). See also (1964WI1B, 1965JA1C).

 1. 17Ne(β+)17F* → 16O + p

The half-life of 17Ne is 102 ± 7 msec (1964MC16), 105 ± 5 msec (1967ES02), 107 ± 5 msec (1967FI10), 115 ± 5 msec (1969HAZE): the mean value is 108.0 ± 2.7 msec. See also (1964FL03, 1964FL05, 1965HA20). The decay is primarily to proton unstable states of 17F at Ex = 4.69, 5.52 and 6.04 MeV, with Jπ = 3/2-, 3/2- and 1/2-, respectively: see Table 17.23 (in PDF or PS) (1967ES02, 1969HAZE). The super-allowed decay to the analog state [17F*(11.20)] has log ft = 3.35 ± 0.10 (1969HAZE). The character of the decay leads to Jπ = 1/2- for 17Ne(0). See also (1963BA63, 1963VL1B, 1964DA13, 1965HA31, 1965MA16, 1965MI1B, 1966HA22).

 2. 20Ne(3He, 6He)17Ne Qm = -26.187

At E(3He) = 62 MeV, 6He groups are observed to five states of 17Ne: see Table 17.22 (in PDF or PS) (R. Mendelson, J.M. Loiseaux, G. Wozniak and J. Cerny, private communication).