A=17F (1977AJ02)

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¹⁷F (1977AJ02)

(See Energy Level Diagrams for ¹⁷F)

GENERAL: See also (1971AJ02) and Table 17.17 [Table of Energy Levels] (in PDF or PS).

Shell and cluster models: (1970HA49, 1972EN03, 1972LE1L, 1973DE13, 1973KU04, 1973LA1D, 1973RE17, 1973SM1C, 1974LO04).

Special levels: (1969WI1C, 1971SE1C, 1972BE1E, 1972EN03, 1973LE06, 1974VA24).

Electromagnetic transitions: (1970AL1D, 1970HA49, 1970SI1J, 1972EN03, 1972SE1G, 1973HA53, 1973LE06, 1974HA1C, 1974LO04, 1974MC1F, 1976SH04).

Special reactions: (1971AR02, 1974LI1D, 1975WI07).

Other topics: (1970RY04, 1970SI1J, 1971AU02, 1971SE1C, 1971NG01, 1972BA25, 1972CA37, 1972CH16, 1972LE1L, 1972SH32, 1973DE13, 1973GO1H, 1973OS1A, 1973RE17, 1973RO1R, 1974BR1E, 1974RE03, 1974SL1C, 1974VA24, 1975SH20, 1975SH1H).

Ground state:

μ = 4.7223 ± 0.0012 nm (1974SHYR);

Q = 0.10 ± 0.02 b (1974MI21).

1. ¹⁷F(β⁺)¹⁷O Q_m = 2.762

The half-life of ¹⁷F is 65.2 ± 0.2 sec (1969WO09), 64.50 ± 0.25 sec (1972AL42). The mean of previous values [see Table 17.18 (in PDF or PS) in (1971AJ02)] was 66.0 ± 0.2 sec which was the value reported by (1960JA12). We adopt τ_1/2 = 64.50 ± 0.25 sec, log ft = 3.488 ± 0.001 (1972AL42) but suggest that another measurement of this half-life is in order. The upper limit for the β⁺ decay to ¹⁷O*(0.87) is < 3.4 × 10^-4 per decay (1969GA05) [log ft > 5.6]. See also (1970KO41, 1970MC23, 1971BH04, 1971LI1H, 1971WI18, 1972WI28, 1972WI1C, 1973LA03, 1973MU1D, 1973WI04, 1973WI11, 1974WI1M, 1975BA59, 1975BL1G, 1975KR14, 1975WI1E; theor.).

2. ¹²C(¹²C, ⁷Li)¹⁷F Q_m = -16.861

See (1971AJ02).

3. ¹²C(¹⁴N, ⁹Be)¹⁷F Q_m = -10.436

See (1975ZE1C).

4. ¹⁴N(³He, γ)¹⁷F Q_m = 15.8437

The yield of γ₀₊₁ at 90° shows resonant structures at E(³He) = 4.35 ± 0.05, 5.36 ± 0.05, 5.7 and 6.28 ± 0.05 MeV, corresponding to ¹⁷F*(19.42, 20.25, 20.5, 21.01), respectively. Angular distribution measurements are consistent with J^π = 5/2⁺, 7/2^-, (3/2^-) and 1/2⁺ for these states; the widths of the three highest ones are ≈ 350, 210 and 280 keV (1972MO39).

5. (a) ¹⁴N(³He, n)¹⁶F Q_m = -0.969 E_b = 15.8437
(b) ¹⁴N(³He, p)¹⁶O Q_m = 15.2430
(c) ¹⁴N(³He, d)¹⁵O Q_m = 1.8037
(d) ¹⁴N(³He, np)¹⁵O Q_m = -0.4210
(e) ¹⁴N(³He, ³He)¹⁴N
(f) ¹⁴N(³He, α)¹³N Q_m = 10.025
(g) ¹⁴N(³He, 2α)¹¹C Q_m = 2.2955

Excitation functions for p₀ have been measured for E(³He) = 2.5 to 5.5 MeV (1963GO09), 3.5 to 18 MeV (1972BI01) and 5.5 to 10.5 MeV (1971GU22; also p₁₊₂, p₃, p₄): some large structures are observed. The elastic scattering of ³He (reaction (e)) has been studied for E(³He) = 4 to 7 MeV: there is some evidence in the excitation functions of the resonances reported in (³He, γ) (reaction 4) (1972MO39). The yields of α₀, α₁ and α₂₊₃ (reaction (f)) in the range E(³He) = 2.5 to 8.5 MeV show broad un-correlated fluctuations, except for a structure at E(³He) = 4.5 MeV (1970KN01). However, a study of α₀ [E(³He) = 3.5 to 7 MeV] shows, at θ = 150°, strong structures corresponding to the resonances at E(³He) = 4.35 and 5.36 MeV reported in (³He, γ): their analysis suggests Γ = 300 and 350 keV (1972MO39). For reaction (d) see (1973AD02). See also (1971ADZZ), (1971AJ02, 1974LO1B), (1974FA1A; theor.), ¹⁶O, ¹⁶F, and ¹³N, ¹⁴N and ¹⁵O in (1976AJ04).

6. ¹⁴N(α, n)¹⁷F Q_m = -4.7347

See ¹⁸F in (1972AJ02). See also (1973DO1K).

7. ¹⁴N(⁶Li, t)¹⁷F Q_m = 0.049

At E(⁶Li) = 18 MeV the triton groups in this reaction and the ³He groups in the mirror reaction have been compared. ¹⁷F*(3.86, 5.22, 5.67 + 5.68) are strongly excited. A state at E_x = 5.220 ± 0.010 MeV is identified as the mirror state to ¹⁷O*(5.22): its probable J^π is 9/2^-. ¹⁷F*(0, 0.50, 3.10, 4.70, 5.52, 5.82, 6.04, 6.70) are also populated (1973BI01). See also (1972BA1P).

8. ¹⁴N(¹⁰B, ⁷Li)¹⁷F Q_m = -1.944

See (1976HAXX).

9. ¹⁵N(³He, n)¹⁷F Q_m = 5.0101

Angular distributions have been measured for the neutron groups to ¹⁷F*(0, 0.50, 3.10, 3.86) at E(³He) = 3.8 and 4.8 MeV and to ¹⁷F*(4.70, 5.52, 5.68) at the higher energy. The population of a state at E_x = 5.179 ± 0.020 MeV and of ¹⁷F*(6.04, 6.70, 7.03, 7.36, 8.08) is also reported. ¹⁷F*(5.18) probably has J^π = 3/2⁺ or 9/2⁺ (1972TH07, 1973ET01). Neutron groups have also been reported to ¹⁷F states at E_x = 11.195 ± 0.007, 12.540 ± 0.010 and 13.059 MeV, with Γ < 20, < 25 and < 25 keV, respectively. Angular distributions at E(³He) = 10.36 and 11.88 MeV lead to J^π = 1/2^- for ¹⁷F*(11.20) [L = 0], 3/2^- or 5/2^- for ¹⁷F*(12.54) and (3/2^-, 5/2^-) for ¹⁷F*(13.06). These three states are probably the first three T = 3/2 states in ¹⁷F (1969AD02). The branching ratios for transitions to ¹⁶O*(0, 6.05, 6.13) for ¹⁷F*(11.20) and for the analog T = 3/2 state in ¹⁷O are displayed in Table 17.11 (in PDF or PS): the ratios of the reduced widths are quite different in the two mirror nuclei (1970MC02, 1973AD02).

10. ¹⁶O(p, γ)¹⁷F Q_m = 0.6007
Q₀ = 600.35 ± 0.28 keV (1975RO05).

At low energies the direct capture to ¹⁷F*(0, 0.50) has been observed: see (1971AJ02) for a summary of the earlier measurements and (1973RO34: 0.3 - 3.1 MeV), (1975CH34: 0.85 - 2.55 MeV). Extrapolation of cross section data leads to S(0) = 9 keV · b (1973RO34), 7.45 keV · b (1971BA1A). See also (1973CL1E, 1975CH34). An anomaly is observed at E_p = 2.66 MeV [¹⁷F*(3.10)] in the yield of the γ-ray transition to ¹⁷F*(0.50): Γ_γ = 12 ± 2 meV; C²S = 0.90 and 1.00, respectively, for ¹⁷F*(0, 0.50) (1973RO34). Another resonance is observed at E_p = 3.47 MeV [¹⁷F*(3.86)]: angular distributions of the γ-rays are characteristic of an almost pure dipole transition. The data lead to J^π = 5/2^-, Γ < 1.5 keV, Γ_γ = 0.11 ± 0.02 eV, τ_m = 6 ± 1 fsec (1963SE14). For ¹⁷F*(0.50), τ_m = 445 ± 22 psec (1960KA10).

Five resonances corresponding to T = 3/2 states are observed in the γ₁ and γ₀ + γ₁ yields: see Table 17.18 (in PDF or PS) for the reported parameters (1975HA06). The lowest T = 3/2 states of even parity at E_x = 13.27 and 14.02 MeV [J^π = (1/2⁺) and 5/2⁺] (see Table 17.19 (in PDF or PS)) are not observed here: Γ_γ ≤ 7 and ≤ 11.8 eV, respectively (1975HA06). The (E1) values for the T = 3/2 states are in good agreement with shell model 2p - 1h calculations using realistic Kuo-Brown interaction matrix elements (1975HA06).

The (γ₀ + γ₁) yield at 90° has been studied for E_p = 15.75 to 31.66 MeV: it shows the giant dipole resonance centered at E_x = 22 MeV with a width of ≈ 5 MeV and a pigmy resonance centered at 17.5 MeV. The integrated strength of the, mainly T = 1/2, giant resonance is 10 MeV · mb: the observed strength distribution is in good agreement with odd parity 2p - 1h, 1p excitation calculations. The pigmy resonance is due to f_7/2 → d_5/2: the main f_7/2 strength lies in two states at E_x = 16.9 and 18.0 MeV (1975HA07). See also (1971JO1D).

11. (a) ¹⁶O(p, p)¹⁶O E_b = 0.6007
(b) ¹⁶O(p, pα)¹²C Q_m = -7.1616
(c) ¹⁶O(p, pn)¹⁵O Q_m = -15.6640

Yield curves for elastic protons, protons scattered to ¹⁶O*(6.05, 6.13, 6.92, 7.12, 8.87) and for γ-rays from ¹⁶O*(6.13, 6.92) have been studied at many energies up to E_p = 46 MeV: see Table 17.19 (in PDF or PS) in (1971AJ02) for a listing of the earlier measurements and (1975CH34: p₀, 171.5_c.m., E_p = 0.39 to 1.99 MeV), (1971AU04: p₁₊₂, p₅; σ_t; E_p = 17.0 to 46.1 MeV) and (1969BU1B, 1971BU05: p₀, p₁₊₂, p₅; E_p = 21.3 to 38.5 MeV). The observed resonances are displayed in Table 17.19 (in PDF or PS). Phase-shift analyses of elastic scattering polarization and cross section data have led to an increased understanding of the T = 1/2 states of ¹⁷F (1971PR05, 1975HI02) and the work of (1974SK02, 1976HI09) has fixed the characteristics of the first seven T = 3/2 states of ¹⁷F. (1974SK02) has studied the isospin multiplet mass equation by comparing analog T = 3/2 states in A = 17. See also (1976IK01).

Other polarization measurements are reported at E_p = 3.47 and 6.83 MeV (1974DA04; p₀), 20 MeV (1974PL05, 1976PL1C; p₃, p₄, p₆, p₇), 30.3 MeV (1976DE12; p₀, p₂, p₃, p₅), 30.4 MeV (1972GR02; p₀, p₅), 30.4 to 39.9 MeV (1976LE16; p₅) and 49.4 MeV (1970CL10; p₀). See also (1971KL03). Total reaction cross section measurements are reported at E_p = 18.8 to 47.7 MeV (1975CA26), 21 to 43 MeV (1975SL02), and 231, 345, 464 and 552 MeV (1972RE06). See also (1971BE1D, 1971CR1A, 1973GO27, 1976WUZZ).

For reaction (b) see (1971EP03: 46.8 MeV). For reaction (c) see (1965VA23). For spallation measurements see (1973BE36, 1974LA18). See also (1970SH1J, 1971EP1D, 1971ST30, 1972AM04, 1973BA81).

See also ¹⁶O, (1971AJ02, 1971PA1H), (1975ME1E; astrophys. considerations) and (1972GE07, 1972PH06, 1973CL01, 1973MO1E, 1973RU07, 1973TH02, 1974SI13, 1975BA05, 1975CA05, 1975GE08, 1975SM01, 1975TA1A, 1975TH03, 1975TH12, 1976COZV; theor.).

12. ¹⁶O(p, n)¹⁶F Q_m = -16.212 E_b = 0.6007

See ¹⁶F and (1974MO06; theor.).

13. ¹⁶O(p, d)¹⁵O Q_m = -13.4393 E_b = 0.6007

The excitation function for d₀ at θ = 70° has been measured for E_p = 21 to 38.5 MeV: a strong resonance is observed at E_p ≈ 24 MeV (1969BU1B, 1971BU05): see Table 17.19 (in PDF or PS). For polarization measurements see (1967CH15; 30.3 MeV; d₀, d₃). See also ¹⁵O in (1976AJ04) and (1970DE38, 1971SA1D; theor.).

14. (a) ¹⁶O(p, t)¹⁴O Q_m = -20.4064 E_b = 0.6007
(b) ¹⁶O(p, ³He)¹⁴N Q_m = -15.2430

The excitation function at θ = 70° for tritons (reaction (a)) has been measured for E_p = 32 to 39.5 MeV: no structure is observed (1969BU1B, 1971BU05). Differential cross sections and analyzing powers have been studied at E_p = 43.8 MeV for the transitions to ¹⁴O*(0, 5.17, 6.29, 6.59, 7.78, 9.72) and ¹⁴N*(0, 2.31, 3.95, 5.11, 7.03, 9.17): attempts to fit the analyzing powers with zero-range DWBA were only successful for the first pair of analog states [¹⁴O_g.s., ¹⁴N*(2.31)] (1974MA12). For other polarization measurements see (1970NE17: E_p = 49.5 MeV; t₀, ³He to ¹⁴N*(0, 2.31)). See also (1975MI01, 1976PL1C), (1971AJ02, 1972HA1X, 1976DA1K) and ¹⁴N and ¹⁴O in (1976AJ04).

15. ¹⁶O(p, α)¹³N Q_m = -5.218 E_b = 0.6007

Excitation functions of various α-groups and activation functions have been measured from threshold to E_p = 44 MeV: see Table 17.19 (in PDF or PS) in (1971AJ02) for the earlier work and (1973MC12, 1973MC1H: 5.6 to 7.7 MeV; σ_t), (1973NE12: 5.7 to 10.5 MeV; σ_t for α₀). (1971GU23: 19 to 44 MeV; σ_t for α₀, α₁, α₂₊₃, α₄) and (1969BU1B, 1971BU05: 21.5 to 38.5 MeV). In addition, the work of (1974SK02, 1976HI09) has established the parameters of the first seven T = 3/2 states of ¹⁷F: see Table 17.19 (in PDF or PS). No other resonances corresponding to T = 3/2 states have been observed below E_x = 16.21 MeV (1974SK02). Resonances corresponding to T = 1/2 states are also reported in Table 17.19 (in PDF or PS). Some broad structures have been reported above E_p ≈ 15 MeV: see (1971AJ02) and (1971BU05, 1971GU23): particularly strong peaks appear at E_p ≈ 22 and 25.5 MeV (1971BU05).

This reaction is involved in explosive oxygen burning in stars: cross sections, and reaction rates determined as a function of the temperature of the star are discussed in (1973NE12, 1973MC12, 1973WO1C). See also (1973AR1E).

16. ¹⁶O(d, n)¹⁷F Q_m = -1.6239

E_thresh. for ²H(¹⁶O, n)¹⁷F = 14530 ± 3.2 keV (1973MA1V).

Slow neutron thresholds have been observed corresponding to the ground and first excited states of ¹⁷F: see (1971AJ02). The E_x of ¹⁷F*(0.50) is 495.33 ± 0.10 keV (1966AL10; from γ-measurement); τ_m = 407 ± 9 psec (1964BE15). Neutron groups have been observed corresponding to ¹⁷F*(0, 0.50, 3.10, 3.86, 4.70). Angular measurements have been obtained for the n₀ and n₁ groups (l_p = 2 and 0; J^π = 5/2⁺ and 1/2⁺, respectively) for E_d ≤ 12 MeV: see Table 17.21 (in PDF or PS) in (1971AJ02). For polarization measurements see (1972AN1G; n₀, n₁; E_d = 3 - 4 MeV). See also (1971TH1E, 1976FR13), (1976LO1B; applied) and (1971DZ07, 1976SH13; theor.).

17. (a) ¹⁶O(³He, d)¹⁷F Q_m = -4.8930
(b) ¹⁶O(³He, dp)¹⁶O Q_m = -5.4938

At E(³He) = 18 MeV, angular distributions of the deuterons to ¹⁷F*(0, 0.50, 3.104 ± 0.003, 3.857 ± 0.004) have been measured. The spectroscopic factors for ¹⁷F*(0, 0.50) are 0.94 and 0.83. Two step processes appear to be involved in the excitation of ¹⁷F*(3.10, 3.86) (1975FO16). See also (1972PR1D). For reaction (b) see (1967HO14). See also (1971AJ02).

18. ¹⁶O(α, t)¹⁷F Q_m = -19.2139

See (1972PR1D). See also (1971AJ02).

19. ¹⁶O(⁷Li, ⁶He)¹⁷F Q_m = -9.377

The angular distribution involving ¹⁷F_g.s. has been measured at E(⁷Li) = 36 MeV (1973SC26).

20. ¹⁶O(¹⁰B, ⁹Be)¹⁷F Q_m = -5.985

Angular distributions have been measured at E(¹⁰B) = 100 MeV for the transitions to ¹⁷F*(0 + 0.50, 5.1, 8.1) (1975NA15).

21. ¹⁶O(¹¹B, ¹⁰Be)¹⁷F Q_m = -10.629

¹⁷F*(0 + 0.50) are populated at E(¹¹B) = 113 MeV (1967PO13). See also (1971AL1D; theor.).

22. ¹⁶O(¹²C, ¹¹B)¹⁷F Q_m = -15.357

See (1972SC21). See also (1971SC1F).

23. ¹⁶O(¹⁴N, ¹³C)¹⁷F Q_m = -6.950

Angular distributions involving ¹⁷F*(0, 0.50) have been measured at E(¹⁴N) = 79 MeV (1976MO03) and 155 MeV (1975NA15, 1976NA09).

24. ¹⁶O(¹⁶O, ¹⁵N)¹⁷F Q_m = -11.527

See (1974RO04).

25. ¹⁷O(p, n)¹⁷F Q_m = -3.542

E_thresh. = 3743 ± 6 keV (1973BA31).

Angular distributions of the n₀ and n₁ groups have been obtained for E_p = 6.95 to 13.50 MeV (n₀) and 6.95 to 12.45 MeV (n₁). There appears to be collective enhancement in the L = 2 transition to ¹⁷F*(0.5). A large spin-flip term in the effective two-body force is necessary to account for the strength of the ground state transition (1969AN06). See also ¹⁸F in (1978AJ03).

26. ¹⁷O(³He, t)¹⁷F Q_m = -2.778

At E(³He) = 17.3 MeV, angular distributions have been obtained for the tritons corresponding to ¹⁷F*(0, 0.50). The data have been analyzed using DWBA and a two-body interaction between the incident and target nucleons. An exact coupled-channel-equation calculation was also made for the ground state transition (1968HA30). See also (1971AJ02).

27. ¹⁷Ne(β⁺)¹⁷F Q_m = 14.53

See ¹⁷Ne.

28. ¹⁹F(γ, 2n)¹⁷F Q_m = -19.581

See (1959OC07, 1976AN06) and ¹⁹F in (1978AJ03).

29. ¹⁹F(p, t)¹⁷F Q_m = -11.099

Angular distributions have been measured for the t₀, t₁, t₂ and t₃ groups at E_p = 22.8 MeV (1963HO24), 42.4 MeV (1974NE03) and 45 MeV (1972HU1B). See also (1968AN1A, 1972PR1D), (1971AJ02) and ²⁰Ne in (1978AJ03).

30. ²⁰Ne(p, α)¹⁷F Q_m = -4.1293

See (1971AJ02). See also (1973CL1E; astrophys. considerations).