Information on mass chains and nuclides

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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 E_b for p, ³He and α are, respectively, 1.50, 6.46 and 9.05 MeV. [E_b 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 E_x = 4.69, 5.52 and 6.04 MeV, with J^π = 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 J^π = 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).