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17N (1977AJ02)

(See Energy Level Diagrams for 17N)

GENERAL: See also (1971AJ02) and Table 17.1 [Table of Energy Levels] (in PDF or PS).

Theory and reviews: (1973PA1F, 1973RE17, 1973TO16, 1973WI15, 1974HA61, 1975BE31).

Experimental papers: (1971AR02, 1973KO1D, 1976DE1P).

1. (a) 17N(β-)17O* → 16O + n Qm = 4.536
(b) 17N(β-)17O Qm = 8.682

The half-life of 17N is 4.169 ± 0.008 sec (1972AL42): the mean of earlier values (see (1971AJ02)) was 4.16 ± 0.01 sec. See also (1976FI03). The decay is principally [see Table 17.2 (in PDF or PS)] to the neutron unbound states 17O*(4.55, 5.38, 5.94) [Jπ = 3/2-, 3/2- and 1/2-, respectively]. The nature of the decay is in agreement with Jπ = 1/2- for 17Ng.s. (1973PO11, 1976AL02). For measurements of the neutron energies see (1973PO11). Excitation energies of 17O states have been determined by (1973PO11) from En [e.g., 4.552 ± 0.004 MeV] and by (1976AL02). From Eγ to the first excited state whose Ex was taken to be 870.8 ± 0.2 keV, Ex for the second excited state of 17O is 3055.2 ± 0.3 keV; the direct ground state decay of that state is < 1.5% (1976AL02). See also (1972SH1F) and (1972TO03; theor.). For a comparison of the 17N and 17Ne decays see Table 17.3 (in PDF or PS) (1976AL02): the large values of δ show the importance of final state nuclear asymmetry in odd-A nuclei. See also (1972AL42).

2. 10Be(11B, α)17N Qm = 10.980

See (1976FI03).

3. 11B(7Li, p)17N Qm = 8.416

Proton groups and γ-rays have been studied by several groups: see Tables 17.4 (in PDF or PS) and 17.5 (in PDF or PS). Angular distributions of γ-rays, branching ratio and lifetime measurements lead to most of the Jπ shown in these two tables; transition energies have also been very accurately determined (1974RO27, 1974RO28). See also (1971AJ02).

4. 12C(7Li, 2p)17N Qm = -7.541

See (1971HO26, 1976CE1E).

5. 14C(α, p)17N Qm = -9.715

See (1961PE28).

6. 14C(18O, 15N)17N Qm = -5.735

See (1972EY01).

7. 15N(t, p)17N Qm = -0.108

See (1971AJ02).

8. 17O(n, p)17N Qm = -7.896

See 18O in (1978AJ03).

9. 18O(γ, p)17N Qm = -15.943

See 18O in (1978AJ03).

10. 18O(n, d)17N Qm = -13.718

See 19O in (1972AJ02).

11. 18O(d, 3He)17N Qm = -10.449

Angular distributions of eight 3He groups have been measured at Ed = 52 MeV; see Table 17.4 (in PDF or PS) (1971HA48).

12. 18O(t, α)17N Qm = 3.872

Alpha particle groups corresponding to 17N states with Ex < 4.3 MeV have been studied by (1960JA13): see Table 17.3 (in PDF or PS) in (1971AJ02). (1976GU14: Et = 3.5 MeV) have studied α - γ angular correlations and γ-branching ratios for the first six excited states of 17N: see Tables 17.4 (in PDF or PS) and 17.5 (in PDF or PS).