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## 17Ne (1977AJ02)

(See the Isobar Diagram for 17Ne)

GENERAL: See also (1971AJ02) and Table 17.20 [Table of Energy Levels] (in PDF or PS).

Theory and reviews: (1971HA1Y, 1973HA77, 1973RE17, 1975BE31).

Mass of 17Ne: The mass excess of 17Ne, determined from a measurement of the Q-value of 20Ne(3He, 6He)17Ne is 16.48 ± 0.05 MeV (1970ME11, 1972CE1A). Then 17Ne - 17F = 14.53 MeV and Eb for p, 3He and α are, respectively, 1.50, 6.46 and 9.05 MeV. See also (1971AJ02).

 1. (a) 17Ne(β+)17F* → 16O + p Qm = 13.93 (b) 17Ne(β+)17F Qm = 14.53

The half-life of 17Ne is 109.0 ± 1.0 msec (1971HA05). Earlier values (see (1971AJ02)) gave a mean value of 108.0 ± 2.7 msec. The decay is primarily to the proton unstable states of 17F at 4.70, 5.52 and 6.04 MeV with Jπ = 3/2-, 3/2- and 1/2-, respectively: see Table 17.21 (in PDF or PS). The super-allowed decay to the analog state [17F*(11.20)] has log ft = 3.29+0.04-0.07. The character of the decay leads to Jπ = 1/2- for 17Neg.s. (1971HA05). See Table 17.3 (in PDF or PS) for a comparison of the mirror 17N and 17Ne decays (1976AL02) and Table 17.11 (in PDF or PS) for the decay of 17F*(11.20). See also (1971HO1D, 1972TO03; theor.).

 2. 20Ne(3He, 6He)17Ne Qm = -26.19

At E(6He) = 62.6 MeV, 6He groups are observed to 17Ne*(0, 1.35, 1.84, 2.77, 3.70, 5.28) [from Fig. 3 in (1972CE1A)]. See also (1970WO1D).