A=19F (1978AJ03)

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¹⁹F (1978AJ03)

(See Energy Level Diagrams for ¹⁹F)

GENERAL: See (1972AJ02) and Table 19.6 [Table of Energy Levels] (in PDF or PS).

Shell model: (1970FL1A, 1972EN03, 1972GU05, 1972LE13, 1972NE1B, 1973DE13, 1973JU1A, 1973LA1D, 1973MA1K, 1973MC06, 1973MC1E, 1973ME1D, 1973SM1C, 1974CO39, 1975BA81, 1975GA1L, 1975MA1U, 1975SUZR, 1977HA33, 1977SH11).

Cluster, collective and rotational models: (1972NE1B, 1973DE06, 1973MC1E, 1973NE1C, 1973RO19, 1976LE19, 1977BU05, 1977HO1F).

Electromagnetic transitions: (1971DU13, 1972EN03, 1972GU05, 1972NE1B, 1973CO1F, 1973GA1H, 1973HA53, 1973PE09, 1973RO19, 1973SU1C, 1974JO12, 1974MC1F, 1974MUZP, 1975BO12, 1975GA06, 1975GA1L, 1975HE1K, 1975NA21, 1975NA20, 1976BO38, 1977BU05).

Special states: (1972FO29, 1972GA14, 1972HI17, 1972EN03, 1972LE13, 1972NE1B, 1973JU1A, 1973MC06, 1973MU18, 1973RO19, 1974OLZT, 1975BA81, 1975BO12, 1975BO1T, 1975MA1U, 1975MC1H, 1975SUZR, 1976BO1T, 1976BO43, 1977BU05, 1977HA33, 1977SC08, 1977SH11).

Complex reactions involving ¹⁹F: (1972PU1B, 1972OH01, 1973WI15, 1974AL17, 1975AR14, 1975HO1K, 1975RE08, 1975VO09, 1976BA08, 1976BR1T, 1976BU16, 1976EG02, 1976HI05, 1976NA11, 1977AR06, 1977BU05, 1977CO14, 1977NA03, 1977PR05, 1977ST1J, 1977TA07, 1977VA02).

Applied topics: (1975BE1U, 1975GO1U, 1976EA1A, 1976EC1B, 1976GO1P, 1976RA1J, 1977CO1F).

Astrophysical questions: (1972CL1A, 1973AU1B, 1973AU1C, 1973CA1B, 1973TA1D, 1973TR1B, 1975BU1H, 1975GO1T, 1975MA1R, 1975TR1A, 1976BO1M, 1976GI1C, 1976RO1J, 1976SI1D, 1977ST1J).

Muon and neutrino captures and reactions: (1972BU29, 1972KH1A, 1973HO34, 1974DO1C, 1974EN10, 1975CA1H, 1977MU1A).

Pion capture and reactions^†: (1971GO29, 1972EC1A, 1972HU1A, 1972MI11, 1972PL04, 1973DA1G, 1973HO43, 1973KA19, 1974HU14, 1974LI1H, 1974ST1G, 1974TA18, 1975KA1G, 1975VA1D, 1975VO1D, 1976AS1B, 1976BAYR, 1976EN02, 1976JA04, 1976LI18, 1976SI1J, 1977BA2H, 1977SI01).

^† Gamma rays with E_γ = 109.8 ± 0.1 and 197.0 ± 0.1 keV (1969PO07), 109.8 ± 0.2 and 197.98 ± 0.19 keV (1970BL07) and 198.10 ± 0.10 keV (1972EC1A) have been reported in pion-induced reactions.

Kaon capture: (1972WI04).

Other topics: (1971RO1C, 1971SY1A, 1972BA25, 1972CA37, 1972GA14, 1973CO1F, 1973DE13, 1973GR11, 1973MA1K, 1973MA48, 1973YO1A, 1974CO39, 1974GA36, 1974RE03, 1975BA81, 1975BL1F, 1975HE10, 1975MC1H, 1976BL1C, 1976BO1T, 1976BO43, 1976MA04, 1977DA10, 1977SH11, 1977SH13).

Ground state of ¹⁹F: (1971SH26, 1971TA1A, 1972GU05, 1972VA36, 1973EN1B, 1973HO32, 1973MC06, 1973ME1E, 1973SU1B, 1973SU1C, 1974CO39, 1974DE1E, 1974EN10, 1974MC1F, 1974OLZT, 1974RE03, 1975GA06, 1976CH1T, 1977AN12, 1977BU05).

μ_g.s. = +2.6288 nm (1976FU06);

= +2.628866 (8) nm (V. Shirley, private communication);

μ_0.198 = +3.60 nm (1976FU06);

Q_0.198 = ± 0.11 b (1976FU06). See also (1974MI21, 1974SHYR, 1976BR20).

The mass of ¹⁹F derived from the work of (1975SM02) is 18.99840317 (6) a.m.u. Using the conversion factor 931.5016 (26) MeV/a.m.u., the mass excess of ¹⁹F would then be -1.4875 MeV. (1977WA08) adopts -1.48738 ± 0.00013, as we do also.

1. ⁹Be(¹⁴N, α)¹⁹F Q_m = 13.2739

See (1972AJ02).

2. (a) ¹²C(⁷Li, γ)¹⁹F Q_m = 16.396
(b) ¹²C(⁷Li, n)¹⁸F Q_m = 5.964 E_b = 16.396
(c) ¹²C(⁷Li, p)¹⁸O Q_m = 8.402
(d) ¹²C(⁷Li, d)¹⁷O Q_m = 2.582
(e) ¹²C(⁷Li, t)¹⁶O Q_m = 4.695
(f) ¹²C(⁷Li, α)¹⁵N Q_m = 12.382

For reaction (a) see (1977LO1M). The yield of ¹⁸F [reaction (b)] has been determined for E(⁷Li) = 2.5 to 3.5 MeV (1961NO05). The yields of α-particles have been measured by (1962HO06; 3.2 to 4.0 MeV; α₀, α₁₊₂, α₃), by (1970CA14; 4.4 to 14 MeV; α₀), by (1972CR1B, 1974FO1J (prelim. results); 12 to 25 MeV; α₀), by (1973TS02; 28 to 35 MeV; α to ¹⁵N*(5.27, 5.30, 6.32, 8.57, 9.16, 9.83, 10.70, 12.56)). (1970CA14) report that the cross section for reactions (c), (d), (e), (f) vary strongly over the range E(⁷Li) = 4 to 14 MeV but with little, if any, cross correlation. Strong fluctuations continue to E(⁷Li) = 25 MeV (1974FO1J) and there is some evidence of structures at higher energies (1973TS02). For total reaction cross sections at several energies in the range E(⁷Li) = 4.5 to 13.0 MeV see (1972PO07). See also ¹⁸O here, ¹⁶O and ¹⁷O in (1977AJ02) and ¹⁵N in (1976AJ04).

3. ¹²C(⁹Be, d)¹⁹F Q_m = -0.3005

See (1975VE10).

4. ¹²C(¹¹B, α)¹⁹F Q_m = 7.7303

See (1976DA07, 1977HI01) and (1978EN06). See also (1973FO1A).

5. ¹³C(⁶Li, α)¹⁵N Q_m = 16.2748 E_b = 18.6997

Excitation functions for α₀ have been measured for E(⁶Li) = 7.7 to 16.8 MeV: structures are observed but they are not correlated (1974CO13).

6. ¹⁴N(⁶Li, p)¹⁹F Q_m = 11.1491

Angular distributions have been reported at E(⁶Li) = 5.3 to 6.0 MeV for the proton group to ¹⁹F*(2.78) (1968RI13).

7. (a) ¹⁴N(⁷Li, d)¹⁹F Q_m = 6.123
(b) ¹⁴N(¹⁰B, αp)¹⁹F Q_m = 6.6886

See (1968MI09) for reaction (a) and (1977HI01) for reaction (b).

8. ¹⁵N(α, γ)¹⁹F Q_m = 4.0138

Resonances in the yield of γ-rays are observed below E_α = 8.2 MeV: the parameters for these are displayed in Table 19.8 (in PDF or PS) (1970AI01, 1972RO01, 1972RO33, 1972WO15, 1973RO09, 1974UN01, 1976RO07, 1976SY01, 1977DI08, 1977FI06, 1977SY1A). Branching ratios are shown in Table 19.7 (in PDF or PS) and lifetime measurements in Table 19.10 (in PDF or PS). The J^π values shown in Table 19.8 (in PDF or PS) are based on correlation and angular distribution measurements and on branching ratio determinations. The E_x of states involved in cascade decays are 4377 ± 1 and 4548 ± 2 keV (1976RO07), 3999.6 ± 1.2 and 4031.9 ± 0.4 keV (1973RO09). The K^π = 1/2^- band involves ¹⁹F*(0.110 [1/2^-], 1.46 [3/2^-], 1.35 [5/2^-], 4.00 [7/2^-], 4.03 [9/2^-], 7.16 [11/2^-]) (1973RO09) and possibly ¹⁹F*(8.29) [(13/2^-)] (1974UN01) [J^π in brackets]. The situation concerning the other bands is not as clear: see (1972AJ02) for a discussion of the evidence for other assignments of J^π and K^π. It is suggested that ¹⁹F*(10.41) is likely to be the second 13/2⁺ (2s, 1d)³ state in ¹⁹F (1976SY01). See also (1971RO1C) and (1975SC1Y; astrophys. considerations).

9. (a) ¹⁵N(α, α)¹⁵N E_b = 4.0138
(b) ¹⁵N(α, ⁸Be)¹¹B Q_m = -11.0832

The elastic scattering has been studied for E_α = 1.75 to 5.50 MeV (1959SM02, 1961SM02, 1972MO42) and for 5.2 to 12.0 MeV (1973WE1P; abstract): see Table 19.9 (in PDF or PS) for the observed resonances. For reaction (b) see (1974JE1A).

10. ¹⁵N(⁷Li, t)¹⁹F Q_m = 1.547

This reaction has been studied at E(⁷Li) = 15 and 20 MeV (1970MI1E; prelim. results) and analyzed by (1972KU13, 1974KU07). See also (1971BA2V).

11. ¹⁵N(¹³C, ⁹Be)¹⁹F Q_m = -6.6341

At E(¹³C) = 105 MeV, ¹⁹F*(4.04, 8.27, 8.97, 12.26, 12.67) are strongly populated. ¹⁹F*(2.80, 4.64) are also observed. It is suggested that ¹⁹F*(8.97, 12.26, 12.67) have J^π = 11/2^-, 17/2^- and 15/2^-, respectively, with ¹⁹F*(12.26) belonging to the lowest K^π = 1/2^- band (1976PI16). See, however, Table 19.6 (in PDF or PS).

12. (a) ¹⁶O(t, γ)¹⁹F Q_m = 11.7003 E_b = 11.7003
(b) ¹⁶O(t, n)¹⁸F Q_m = 1.2690
(c) ¹⁶O(t, p)¹⁸O Q_m = 3.7069
(d) ¹⁶O(t, t)¹⁶O
(e) ¹⁶O(t, α)¹⁵N Q_m = 7.6865

Resonances in the yield of γ₀₊₁₊₂ (reaction (a)) are reported at E_t = 1.5 and 2.4 MeV with Γ = 0.10 and 0.12 MeV (1973SC1G; abstract). The excitation function for reaction (b) has been measured for E_t = 0.3 to 2.1 MeV (see (1972AJ02)), 1.1 to 1.7 MeV (1976MA54; n₀) and at E_t = 1.6 to 3.7 MeV (1977RE01): there is evidence for a maximum at E_t = 2.5 MeV. At E_t = 3.7 MeV the cross section is ≈ 0.4 b (1977RE01).

Resonances in the yields of p₀, p₁, α₀ and α₁₊₂ are reported by (1967KO11) corresponding to states with E_x = 12.42, 12.67, (12.75), 12.83, 12.91, 12.97, (13.06) and (13.14) MeV (± ≈ 25 keV) [not all resonances observed in every channel]. See also (1974KA1N). An analysis by the Humblet-Rosenfeld theory of the elastic yield (reaction (d)) in the range E_t = 1.4 to 3.7 MeV suggests a large number of resonances: their parameters are displayed in Table 19.11 (in PDF or PS) (1973WE11). See also (1972AJ02), (1976LE19; theor.), (1973BA1R, 1977RE01; applied), ¹⁸O and ¹⁸F here, and ¹⁵N in (1976AJ04).

13. ¹⁶O(α, p)¹⁹F Q_m = -8.1137

Angular distributions have been measured at E_α = 20.1 MeV (1975PO1F; p₀ → p₅), 26.7 and 33.1 MeV (1961YA02; p₀ → 2, p₃ → 5) and at 40 MeV (1976VA26): see Table 19.12 (in PDF or PS). At E_α = 40 MeV ¹⁹F*(9.872) is strongly excited: it is suggested that it is a 11/2^- state and that the 11/2^- cluster strength is split between it and ¹⁹F*(8.957) (1977KO2L; abstract). See also (1974FO1J) and (1975AR1J, 1975GE18; theor.).

14. ¹⁶O(⁶Li, ³He)¹⁹F Q_m = -4.094

This reaction (and its mirror reaction ¹⁶O(⁶Li, t)¹⁹Ne: see reaction 4 in ¹⁹Ne) have been studied at E(⁶Li) = 24 MeV. Members of the K^π = 1/2⁺ and 1/2^- rotational bands have been identified: see Table 19.13 (in PDF or PS) (1972BI14, 1972GA08). See also (1973FO1A, 1977MA2G).

15. ¹⁶O(⁷Li, α)¹⁹F Q_m = 9.234

Many states of ¹⁹F have been populated in this reaction: see Table 19.14 (in PDF or PS) (1974TS03). See also (1969GL06, 1972BA1P, 1973WE11). It is suggested that ¹⁹F*(8.89, 9.81), which are strongly populated at E(⁷Li) = 35 MeV, are the third 11/2⁺ and the second 13/2⁺ states (1974TS03). See also (1975GO15).

16. ¹⁶O(¹⁰B, ⁷Be)¹⁹F Q_m = -6.968

This reaction, as well as the analog reaction [¹⁶O(¹⁰B, ⁷Li)¹⁹Ne] have been studied at E(¹⁰B) = 100 MeV: an attempt is made to match analog states [see reaction 5 in ¹⁹Ne] but problems of energy resolution are evident (1976HA06).

17. ¹⁶O(¹¹B, ⁸Be)¹⁹F Q_m = 0.4765

The angular distribution for the transition to ⁸Be_g.s. + ¹⁹F_g.s. has been measured at E(¹⁶O) = 60 MeV (1972SC17).

18. (a) ¹⁷O(d, n)¹⁸F Q_m = 3.382 E_b = 13.813
(b) ¹⁷O(d, p)¹⁸O Q_m = 5.8199
(c) ¹⁷O(d, α)¹⁵N Q_m = 9.799

For reaction (a) see ¹⁸F in (1972AJ02); for reaction (b) see ¹⁸O; for reaction (c) see ¹⁵N in (1970AJ04).

19. ¹⁷O(t, n)¹⁹F Q_m = 7.556

Not reported.

20. ¹⁷O(³He, p)¹⁹F Q_m = 8.320

This reaction has been studied at E(³He) = 18 MeV (1974BI1C; abstract).

21. ¹⁷O(α, d)¹⁹F Q_m = -10.033

At E_α = 47.5 MeV many states of ¹⁹F have been populated: angular distributions to the two 7/2⁺ states ¹⁹F*(4.38, 5.47) and to the two states 11/2⁺ states ¹⁹F*(6.50, 7.94) are reported.

It is concluded that ¹⁹F*(4.38) is mostly (d_5/2)³ J = 7/2 and that the higher state is more deformed. In the case of the 11/2⁺ states both appear to be deformed to the same extent suggesting that there is no single 11/2⁺ member of the ground-state rotational band (1975FO07).

22. ¹⁷O(¹³C, ¹¹B)¹⁹F Q_m = -4.865

See (1977CH22).

23. ¹⁸O(p, γ)¹⁹F Q_m = 7.9934

Resonances for capture radiation observed for E_p = 0.3 to 3.0 MeV are displayed in Table 19.15 (in PDF or PS). At the E_p = 0.85 MeV resonance [¹⁹F*(8.80)], the intensity of the transition 8.80 → 3.91 and the anisotropy of the 8.80 → 3.91 → 0 γ-rays limit J of ¹⁹F*(3.91) to 3/2 or 5/2. J = 5/2 is ruled out by the angular distribution of the γ-rays. At the E_p = 1.17 MeV resonance [¹⁹F*(9.10)], the angular distribution of the γ-rays to the 5/2⁺ state at 0.197 MeV indicate J^π = 7/2⁺ [9/2⁺ not completely excluded] for ¹⁹F*(9.10). J = 5/2 or 9/2 is suggested for ¹⁹F*(2.78). The γ-decay of the resonances at E_p = 1.77 and 1.93 MeV is very complex (1965AL20). For branching ratios and Γ_γ see Table 19.7 (in PDF or PS) (1962NE03, 1965AL20, 1971WO12, 1972WO15). See also (1973CL1E; astrophys. considerations).

24. ¹⁸O(p, n)¹⁸F Q_m = -2.4379 E_b = 7.9934

Yield measurements have been reported from E_p = 2.5 to 13.5 MeV: the measurements by (1969BE57; n; 2.6 → 3.3 MeV), (1973BA31; σ_t; 2.6 → 3.9 MeV), (1969DI07; n₁, γ, n₂γ, n₃γ) and n; 3.0 → 7.0 MeV), (1964BA16; σ_t; 3.5 → 10 MeV) and (1973FR10; n₀ → n₄; 4.6 → 6.6 MeV) lead to the resonances shown in Table 19.16 (in PDF or PS). See also ¹⁸F.

25. ¹⁸O(p, p)¹⁸O E_b = 7.9934

Scattering studies have been carried out for E_p = 0.6 to 16.3 MeV [see (1972AJ02)] and at E_p = 3.4 to 6.2 MeV (1973OR01; p₀, R-matrix analysis) and with polarized protons for E_p = 3.8 to 6.1 MeV (1975AL20; p₀, p₁) and at 6.0 to 16.6 MeV (1976MUZP; p₀; prelim.). Observed resonances are displayed in Table 19.17 (in PDF or PS). Pronounced resonance structure continues to E_p = 12 MeV (1976MUZP). Polarization measurements are also reported at E_p = 24.5 MeV (1974ES02). See also (1974PL05, 1974LO1B, 1976PL1C, 1977KU1L, 1977PL1A) and (1975BA05, 1976ES1B; theor.).

26. (a) ¹⁸O(p, d)¹⁷O Q_m = -5.820 E_b = 7.9934
(b) ¹⁸O(p, t)¹⁶O Q_m = -3.7069

Polarized protons at E_p = 24.4 MeV have been used to study both reactions (a) and (b) (1973PI09): see ¹⁶O and ¹⁷O in (1977AJ02). Total cross sections for several deuteron and triton groups are reported at E_p = 20.0, 24.4, 29.8, 37.5 and 43.6 MeV by (1974PI05). See also (1976DA1K, 1976PL1C).

27. ¹⁸O(p, α)¹⁵N Q_m = 3.9796 E_b = 7.9934

Yield measurements have been studied for E_p = 0.50 to 14 MeV: see (1972AJ02). See also (1972WO15). Observed resonances are displayed in Table 19.17 (in PDF or PS). The (astrophysical) hydrogen burning of ¹⁸O proceeds predominantly (≥ 99 %) through the reaction ¹⁸O(p, α)¹⁵N (1974RO1N). See also (1975FO19, 1977CL1F). Total cross section measurements are reported by (1974PI05; 20.6, 26.1, 34.2, 42.2 MeV; α₀, α₁₊₂, α₃). See also (1974LO1B), (1973TU1B; applied) and (1974NI1A; theor).

28. (a) ¹⁸O(d, n)¹⁹F Q_m = 5.7685
(b) ¹⁸O(d, nα)¹⁵N Q_m = 1.7546

Angular distributions of neutron groups corresponding to ¹⁹F states with E_x < 8.2 MeV have been measured at E_d = 3 and 4 MeV: see Table 19.18 (in PDF or PS) (1968GU07, 1972TA26). Gamma-ray measurements are reported in Tables 19.18 (in PDF or PS) (E_x), 19.7 (in PDF or PS) (branching ratios) and 19.10 (in PDF or PS) (τ_m) (1972LE20, 1975LE16). For slow neutron threshold measurements see Table 19.15 (in PDF or PS) in (1972AJ02). At E_d ≈ 5.1 MeV, reaction (b) appears to involve ¹⁹F states at E_x ≈ 8 to 10 MeV (1970BO08).

29. ¹⁸O(³He, d)¹⁹F Q_m = 2.4998

Angular distributions of the deuterons corresponding to many states of ¹⁹F have been analyzed by DWBA: the results are shown in Table 19.18 (in PDF or PS) (1970SC25; E(³He) = 16 MeV). See also (1970GR04). The spectroscopic factors obtained by DWBA for ¹⁹F*(7.54, 8.80), the T = 3/2, J^π = 5/2⁺ and 1/2⁺ analogs of ¹⁹O*(0, 1.47) are in good agreement with those obtained for the ¹⁹O states in the ¹⁸O(d, p)¹⁹O reaction (1971FO18). See also (1970SC25) and (1972EN03, 1973VI01; theor).

30. ¹⁸O(α, t)¹⁹F Q_m = -11.8207

Not reported.

31. ¹⁸O(⁶Li, αn)¹⁹F Q_m = 4.295

For τ_m of ¹⁹F*(0.110) see Table 19.10 (in PDF or PS) (1969NI09).

32. ¹⁹O(β^-)¹⁹F Q_m = 4.819

The decay is primarily by allowed transitions to ¹⁹F*(0.197, 1.55), J^π = 5/2⁺ and 3/2⁺, respectively. Very weak branches are also observed to ¹⁹F*(0.11, 4.39), J^π = 1/2^- and 7/2⁺, respectively: see Table 19.19 (in PDF or PS). The half-life is 26.91 ± 0.08 sec: see reaction 1 in ¹⁹O. The character of the allowed decay to the 5/2⁺ and 3/2⁺ states, and the forbiddeness of the decay to the ground state of ¹⁹F are consistent with J^π = 5/2⁺ for the ground state of ¹⁹O, and then with (7/2⁺) for ¹⁹F*(4.39): see (1966OL01). Gamma-ray branching ratios are displayed in Table 19.7 (in PDF or PS) (1966OL01, 1970CO22). See also (1970CO1D). A preliminary study of the allowed decay to ¹⁹F*(0.197) has been carried out to measure the F/GT mixing ratio (1976PE1D).

33. ¹⁹F(γ, γ)¹⁹F

The energy of the first excited state is 109.894 ± 0.005 keV: its width is (5.1 ± 0.7) × 10^-7 eV (1962BO1A, 1962SE12). ¹⁹F*(1.46, 3.91, 7.66) are also excited: for τ_m of the first of these states see Table 19.10 (in PDF or PS) (1964BO22); E_x = 3906 ± 6 and 7663 ± 4 keV for the latter (1972SH07) [see also for Γ_γ]. The scattering cross section is relatively small and structureless for E_γ = 14 to 30 MeV (1967LO1B).

34. ¹⁹F(γ, n)¹⁸F Q_m = -10.4313

The (γ, n₀) and (γ, n₁) cross section, derived from bremsstrahlung show peaks at E_γ = 12.10 ± 0.04 [0.20 ± 0.05], 12.38 ± 0.04 [0.17 ± 0.05], 13.82 ± 0.05 [0.25 ± 0.10] and 16.24 ± 0.05 [0.30 ± 0.15] MeV [Γ in brackets]. It is suggested that the two lower states have J^π = 1/2^- and the two upper states have J^π = 3/2^-. The integrated cross section in the interval E_γ = 11.9 → 17.9 is 14.4 ± 2.2 MeV · mb (1976SH12). The cross section for (γ, Tn) has been measured for E_γ = 10.5 to 28 MeV: it shows a clear resonance at E_γ ≈ 12 MeV and unresolved structures at higher energies. The integrated cross section to 29 MeV is 108 ± 7 MeV · mb (1974VE06). See also (1976BE1H). Additional structures have been reported in earlier work [see (1972AJ02)] and by (1971BA2W, 1972VA32, 1973CA19). See also (1972TH15, 1975NO10, 1975WO04), (1974BU1A, 1975AB1F, 1975BR1F, 1977DA1B) and ¹⁸F.

35. (a) ¹⁹F(γ, 2n)¹⁷F Q_m = -19.5819
(b) ¹⁹F(γ, 2np)¹⁶O Q_m = -20.1823

The integrated (γ, 2n) cross section to 60 MeV is given as 9.1 ± 0.9 MeV · mb by (1976AN06) who also report a number of structures. The cross section for reactions (a) and (b) for E_γ = 22 to 28 MeV shows no structure (1974VE06). See also (1972VA32, 1973CA19, 1976MA62) and (1976BE1H).

36. ¹⁹F(γ, p)¹⁸O Q_m = -7.9934

The integrated cross sections for the p₀ and p₁ processes at 90° for E_γ = 13.3 → 25.4 and 15.2 → 26.0 MeV are, respectively, 1.80 ± 0.27 and 0.50 ± 0.45 MeV · mb/sr. The (γ, p₀) cross section at 90° shows broad structures at E_γ = 15.0, 17.0 and 23 MeV (1975TS03). Peaks have also been reported corresponding to ¹⁹F*(10.4, 11.4, 11.9, (12.8), 13.6, 15.4, 16.5, (18.1)) (1960FO10). See also (1972TH15, 1976TH1E) and ¹⁸O.

37. ¹⁹F(γ, t)¹⁶O Q_m = -11.7003

This reaction has been studied for the transition to ¹⁶O_g.s. for E_γ = 18 to 23 MeV. Two peaks are observed at E_γ = 18.8 and 20.1 MeV: the angular distribution of t₀ indicates J^π = 1/2^- or 3/2^-, T = 1/2. The triton GDR contributes ≈ 1 % of the total GDR (1974SK04).

38. ¹⁹F(γ, α)¹⁵N Q_m = -4.0138

See (1972TH15). See also (1972SP1B, 1976TH1E, 1977SP06) and ¹⁵N in (1976AJ04).

39. (a) ¹⁹F(e, e)¹⁹F
(b) ¹⁹F(e, en)¹⁸F Q_m = -10.4313
(c) ¹⁹F(e, ep)¹⁸O Q_m = -7.9934

The rms radius of ¹⁹F = 2.885 ± 0.015 fm (1973HA13). Elastic and inelastic form factors have been measured for a number of ¹⁹F states: see (1973HA13, 1975OY01). Table 19.20 (in PDF or PS) shows the extracted radiative ground-state transition strengths (1973HA13, 1975OY01, 1975WI1H). The deformation parameters for the ground state K^π = 1/2⁺ rotational band are β₂ = 0.43 ± 0.02, β₄ = 0.12 ± 0.02 (1975OY01).

For reaction (b) see (1975WO04); for reaction (c) see (1975TS03). See also (1975BE1T), (1972THZF, 1974DE1E, 1975BE1G) and (1972AJ02) for the earlier work.

40. ¹⁹F(n, n')¹⁹F

Angular distributions of neutron groups have been reported for E_n = 2.6 and 14.1 and 14.2 MeV: see (1972AJ02). E_x for the first six excited states of ¹⁹F, derived from γ-ray measurements, are 109.8 ± 0.2, 197.2 ± 0.2, 1345.4 ± 0.3, 1456.9 ± 1.1, 1554.0 ± 0.3 and 2775.1 ± 3.5 keV (1968SP01) [see (1972AJ02) for other, unpublished, measurements]. E_γ = 110.1 ± 0.2 and 197.2 ± 0.3 keV (1972OP01), 1236.9 ± 0.6 and 1358.6 ± 0.7 keV (1976PR08). Gamma decay of states with E_x < 5.4 MeV is reported by (1972NI05). See also (1973LE1C, 1974RO03) and ²⁰F.

41. (a) ¹⁹F(p, p)¹⁹F
(b) ¹⁹F(p, 2p)¹⁸O Q_m = -7.9934

Table 19.21 (in PDF or PS) displays energy levels of ¹⁹F derived from this reaction (1968GU07, 1969PO03, 1978BH01). Angular distributions of various proton groups have been measured from E_p = 4.3 to 17.5 MeV: see (1972AJ02) and at 30 MeV (1973DE06, 1974DE46; see Table 19.21 (in PDF or PS)). The ground state rotational band is characterized by β₂ = 0.44 ± 0.04, β₄ = 0.14 ± 0.04 (1973DE06, 1974DE46). See Tables 19.7 (in PDF or PS) and 19.10 (in PDF or PS) for branching ratio and τ_m measurements. See also (1972SO1A, 1973HE1E). For reaction (b) see (1972HI10). See also (1973LE1C), (1973RU1B; applied work), (1973PE09, 1977DE17; theor.) and (1972AJ02).

42. ¹⁹F(d, d)¹⁹F

Angular distributions of elastically scattered deuterons have been measured for E_d = 2.0 to 15 MeV: see (1972AJ02). In addition, angular distributions have been measured at E_d = 15 MeV for d₁ → d₅ (1970DE06) and B(Eλ) have been derived. See also (1971BE2F). For polarization measurements see (1971BO39, 1977AN24) and (1978EN06). See also (1972SC1F; theor.).

43. ¹⁹F(t, t)¹⁹F

Elastic angular distributions have been measured at E_t = 2 and 7.2 MeV: see (1972AJ02).

44. (a) ¹⁹F(³He, ³He)¹⁹F
(b) ¹⁹F(³He, ⁶He)¹⁶F Q_m = -14.845

Elastic angular distributions have been measured for E(³He) = 4.0 to 29 MeV [see (1972AJ02)] and at 16 MeV (1974VE03; also to ¹⁹F*(0.20)). The triton reduced width for ¹⁹F, derived from a study of reaction (b) at E(³He) = 30.0 and 40.7 MeV, is 0.021 (1972OH01). See also (1972YO02).

45. (a) ¹⁹F(α, α)¹⁹F
(b) ¹⁹F(α, 2α)¹⁵N Q_m = -4.0138
(c) ¹⁹F(α, αt)¹⁶O Q_m = -11.7003

Angular distributions of elastically scattered α-particles have been measured at E_α = 19.9 to 23.3 MeV and at 38 MeV [see (1972AJ02)]. Many inelastic groups have also been studied: see Table 19.22 (in PDF or PS) (1973KR20). The ground state K^π = 1/2⁺ rotational band is characterized by β₂ = 0.35 and β₄ = 0.12 (1973KR20).

The energy of the γ-ray from 1.35 → 0.11 transition is 1235.8 ± 0.2 keV. Using E_x = 109.894 ± 0.005 keV for the energy of the first excited state, E_x for ¹⁹F* is then 1345.7 ± 0.2 keV (1967WA13). At E_α = 12.7 MeV, a state at 4.648 MeV is populated which is then observed to γ-decay to the 9/2⁺ state at 2.78 MeV. The angular distribution of the cascade γ-rays and the lifetime of ¹⁹F*(4.65), set J^π = 13/2⁺ for ¹⁹F*(4.65) (1969JA09). See also (1971BE60, 1972BA1R). For reactions (b) and (c) at E_α = 60.2 MeV, see (1972CH18).

46. (a) ¹⁹F(⁶Li, ⁶Li)¹⁹F
(b) ¹⁹F(⁷Li, ⁷Li)¹⁹F

Elastic angular distributions have been reported for both reactions at E(Li) = 20 MeV (1969BE90) and 34 MeV (1975WI30). See also (1972WA31; theor.).

47. (a) ¹⁹F(¹⁰B, ¹⁰B)¹⁹F
(b) ¹⁹F(¹²C, ¹²C)¹⁹F

For reaction (a) see (1971KN05). For reaction (b) see (1969VO10, 1972SC03; E(¹⁹F) = 40, 60 and 68.8 MeV). See also (1973BR1C, 1975GR41, 1975VO1B, 1977BA3E, 1977PE1J).

48. (a) ¹⁹F(¹⁴N, ¹⁴N)¹⁹F
(b) ¹⁹F(¹⁵N, ¹⁵N)¹⁹F

For reaction (a) see (1972AJ02). The elastic scattering has been studied at E(¹⁵N) = 23, 26 and 29 MeV by (1973GA14). See also (1975VO1B).

49. (a) ¹⁹F(¹⁶O, ¹⁶O)¹⁹F
(b) ¹⁹F(¹⁸O, ¹⁸O)¹⁹F

Elastic angular distributions have been studied at E(¹⁶O) = 21.4 and 25.8 MeV (1975MO31) and at E(¹⁹F) = 27, 30, 33 and 36 MeV (reaction (a)) [also to ¹⁹F*(1.46) at the two higher energies] and at 27, 30 and 33 MeV (reaction (b)) (1973GA14). See also (1973VO1E, 1975VO1B) and (1976OH03, 1977SC1K; theor.).

50. ¹⁹F(²⁰Ne, ²⁰Ne)¹⁹F

See (1972AJ02).

51. ¹⁹Ne(β⁺)¹⁹F Q_m = 3.2383

See ¹⁹Ne.

52. ²⁰Ne(γ, p)¹⁹F Q_m = -12.8447

See (1972AJ02) and ²⁰Ne here.

53. ²⁰Ne(n, d)¹⁹F Q_m = -10.6200

See (1976KI1D).

54. ²⁰Ne(d, ³He)¹⁹F Q_m = -7.3515

At E_d = 52 MeV, ³He groups are observed, and angular distributions are reported, corresponding to states at E_x = 0.15 ± 0.04, 1.51 ± 0.03, 2.83 ± 0.04 (l = 4), 3.99 ± 0.07, 4.56 ± 0.02 (l = 1), 5.44 ± 0.05, 5.69 ± 0.07 (l = 1), 6.10 ± 0.03, 6.78 ± 0.02 (l = 1) and 10.42 ± 0.15 MeV (1970KA31). See also (1971IN1C) and (1972EN03, 1973EL07, 1973SA1A; theor.).

55. ²⁰Ne(t, α)¹⁹F Q_m = 6.9694

Observed α-groups are displayed in Table 19.23 (in PDF or PS) where spectroscopic factors are compared with those of analog states in n¹⁹Ne (1961SI03, 1974GA28). For τ_m of ¹⁹F*(4.65) see Table 19.10 (in PDF or PS) (1969BH01).

56. ²¹Ne(n, t)¹⁹F Q_m = -11.124

Not reported.

57. ²¹Ne(p, ³He)¹⁹F Q_m = -11.888

At E_p = 45 MeV, ³He groups are observed to some T = 1/2 states in ¹⁹F and to the 3/2⁺, T = 3/2 analog of ¹⁹O*(0.095): E_x = 7.660 ± 0.035 MeV (1969HA38). At E_p = 40 MeV comparison of the ground-state angular distributions in this reaction and in the mirror (p, t) reaction [see reaction 15 in ¹⁹Ne] shows a suppression of the S = 1, T = 0 component of the (p, ³He) cross section: this is observed to occur for all T_Z = 1/2 nuclei with A < 40 (1976NA18).

58. ²¹Ne(d, α)¹⁹F Q_m = 6.465

The population of the first three states of ¹⁹F has been observed (1952MI54).

59. ²²Ne(p, α)¹⁹F Q_m = -1.675

The parity-non-conserving asymmetry of the 110 keV γ-rays emitted by polarized ¹⁹F* nuclei in δ = -(1.8 ± 0.9) × 10^-4 (1975AD01). See also (1973BR1C, 1976AD1B, 1977AD1C) and (1975BO12, 1976BO38).

60. ²³Na(n, n'α)¹⁹F Q_m = -10.467

See (1966WO03).