
^{17}F (1986AJ04)(See Energy Level Diagrams for ^{17}F) GENERAL: See (1982AJ01) and Table 17.17 [Table of Energy Levels] (in PDF or PS). Nuclear models: (1982ZH01, 1983BR29, 1984ZI04, 1985ME06). Special states: (1981WI1K, 1983AU1B, 1983BR29, 1983WI15, 1984ANZV, 1985ME06, 1985SH24). Electromagnetic transitions: (1982BR24, 1983BR29, 1983TO08, 1984SAZW, 1985AL21). Astrophysical questions: (1981WA1Q, 1981WE1F, 1982WI1B). Complex reactions involving ^{17}F: (1984GR08, 1984HI1A, 1984HO23). Pion reactions: (1980CR03). Hypernuclei: (1981KO1V, 1984AS1D). Other topics: (1981SH17, 1983AR1J, 1983BR29, 1983KH1D, 1983MA38, 1983SH1T, 1983TO08, 1985AL21, 1985AN28, 1985SH24, 1986WI03). Ground state of ^{17}F: (1983AD1B, 1983ANZQ, 1983AR1J, 1983AU1B, 1983BU07, 1983DE1X, 1983MA38, 1983TO08, 1983ZI1C, 1984BE11, 1984BO11, 1984BR25, 1984ZI04, 1985AN28, 1985AR11, 1985HA18, 1985ZI05, 1986WI03).
Q = 0.10 ± 0.02 b (1974MI21).
The halflife of ^{17}F is 64.49 ± 0.16 sec; log ft = 3.358 ± 0.002. The log ft for the transition to ^{17}O*(0.87) is > 5.6: see (1982AJ01). See also (1983GO2C, 1983RA29, 1985BR29) and (1981ME1H, 1982OS1C, 1984AR1D, 1984BE11; theor.).
See (1982AJ01).
Excitation functions for γ_{0+1}, γ_{2} and γ_{3} have been studied for E(^{3}He) ≈ 3 to 18 MeV. Resonances are reported corresponding to ^{17}F states at 20.1 ± 0.2 (γ_{2}) [Γ = 1.07 ± 0.16 MeV], 20.4 ± 0.1 (γ_{1}) [0.7 ± 0.1] and 21.3 ± 0.1 MeV (γ_{1}) [0.9 ± 0.1] (1983WA05): see Table 17.19 (in PDF or PS) in (1982AJ01). For neutron and chargedparticle channels see reaction 6 in (1982AJ01).
Angular distributions (reaction (a)) have been measured at E(^{6}Li) = 36 MeV involving ^{17}F*(8.43, 10.7, 11.9, 13.51, 14.84). Comparisons are made with the results in the analog reaction (reaction 19) in ^{17}O (1984ET01). [Comment: compare the experimental resolution with the density of states]. For the earlier work see (1982AJ01).
Angular distributions have been reported to most of the states of ^{17}F with E_{x} < 8.1 MeV at E(^{3}He) = 3.8 and 4.8 MeV. Neutron groups have also been reported to ^{17}F 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(^{3}He) = 10.36 and 11.88 MeV lead to J^{π} = 1/2^{} for ^{17}F*(11.20)[L = 0], 3/2^{} or 5/2^{} for ^{17}F*(12.54) and (3/2^{}, 5/2^{}) for ^{17}F*(13.06). These three states are probably the first three T = 3/2 states in ^{17}F (1969AD02). The branching ratios for transitions to ^{16}O*(0, 6.05, 6.13) for ^{17}F*(11.20) and for the analog T = 3/2 state in ^{17}O are displayed in Table 17.11 (in PDF or PS): the ratios of the reduced widths are quite different in the two mirror nuclei. See (1977AJ02) for references.
At low energies the direct capture to ^{17}F*(0, 0.50) is observed. Extrapolation of crosssection data leads to S(0) ≈ 8 keV · b: see (1977AJ02). In addition to two T = 1/2 resonances, five resonances corresponding to T = 3/2 states are observed in the γ_{1} and γ_{0} + γ_{1} yields: see Table 17.18 (in PDF or PS) for the reported parameters. 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 (γ_{0} + γ_{1}) 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 2p1h, 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 (1982AN1D, 1982BE29, 1983RA1G, 1984JEZY), (1982BA80, 1984BO1Q; astrophysics), (1985BL1B, 1986WE1D) and (1982DU1A, 1984PE02; theor.).
Yield curves for elastic protons, protons scattered to ^{16}O*(6.05, 6.13, 6.92, 7.12, 8.87) and for γrays from ^{16}O*(6.13, 6.92) have been studied at many energies up to E_{p} = 46 MeV: see (1971AJ02, 1977AJ02, 1982AJ01). The observed resonances are displayed in Table 17.19 (in PDF or PS). Absolute σ(θ) [θ = 110° to 160°] have been measured for E_{p} = 0.60 to 2.00 MeV to ± 5% (1983BR11). Cross sections for bremsstrahlung emission are reported in the vicinity of the E_{p} = 2.66 MeV resonance by (1983TRZZ). The cross sections of the 6.13 MeV γray at E_{p} = 23.7 and 44.6 MeV have been measured by (1981NA14), and (1979SC07) report the σ_{t} for E_{p} = 190 to 558 MeV. See also (1982AJ01). A_{y} measurements have beem recently reported at E_{pol. p} = 35 MeV (1986OH1C; to ^{16}O*(10.96, 12.80)), 65 MeV (1982SA19; p_{0}), 65 MeV (1984HO17; to ^{16}O*(10.96, 12.80)), 135 and 180 MeV (1983HYZZ; to ^{16}O*(8.87)), 180 MeV (1983FIZW; to many states including ^{16}O*(11.10)) and 200 MeV (1985GL01; p_{0}). At E_{pol. p} = 318 and 498 MeV (1983LOZW, 1986LO1D) have measured A_{y} and spin transfer observables for the p_{0}, p_{2}, p_{3} and p_{4} groups. Polarization transfer coefficients have been studied at E_{pol. p} = 200 MeV to the 4^{} states ^{16}O*(17.79, 19.81) [T = 0] and ^{16}O*(18.98) [T = 1] (1985WIZW, 1986OL1A). The spin rotation parameter Q has been measured for the elastic scattering at E_{pol. p} = 65 MeV by (1986SA1J), at 200 MeV by (1985STZW, 1986ST1G) [see (1986ST1F) for polarization transfer coefficients for ^{16}O*(17.79, 18.98, 19.81)] and at 800 MeV by (1986FE01). See also (1986GL1G). For the earlier work see (1982AJ01). For reaction (b) see (1982REZZ). For reaction (c) see (1983WA1C, 1984WA21). See also (1982REZZ). For fragmentation see (1985GU1A, 1985VDZX). See also ^{16}O and (1982AU1A, 1982BE1A, 1982YA1A, 1983BE1A, 1984GE1A, 1984RE14) and (1981PI11, 1981SH1A, 1982CO17, 1982KO23, 1982NA13, 1982YA07, 1983BE1B, 1983KE1B, 1983KO1B, 1983SH05, 1984GO04, 1984HY01, 1984PH02, 1984PI05, 1984PI17, 1984WO12, 1985AU02, 1985DY03, 1985HY01, 1985KE1A, 1985KO37, 1986DE1G, 1986KU1D, 1986LO1A; theor.).
The analyzing power for the transition to the 4^{} state ^{16}F*(6.37) has been measured at E_{pol. p} = 135 MeV (1982MA11). See also ^{16}F.
The excitation function for d_{0} (θ = 70°) has been measured for E_{p} = 21 to 38.5 MeV. A strong resonance is observed at E_{p} = 24 MeV: see Table 17.19 (in PDF or PS). The analyzing power has been measured for the d_{0} group at E_{pol. p} = 65 MeV (1980HO18). See (1982AJ01) for the earlier work.
See (1982AJ01) and ^{14}N, ^{14}O in (1986AJ01).
Observed resonances are displayed in Table 17.19 (in PDF or PS). Some broad structures have been reported above E_{p} ≈ 15 MeV; particularly strong peaks appear at E_{p} ≈ 22 and 25.5 MeV: see (1977AJ02). This reaction is involved in explosive burning in stars: see (1977AJ02, 1982AJ01) for the earlier work and (1979MO04).
Parameters of the first excited state of ^{17}F are E_{x} = 495.33 ± 0.10 keV, τ_{m} = 407 ± 9 psec: see (1971AJ02). See also Table 17.21 (in PDF or PS) in (1971AJ02). For polarization measurements see (1981LI23) and ^{18}F in (1983AJ01). See also (1983CR1A).
At E(^{3}He) = 18 MeV, angular distributions of the deuterons to ^{17}F*(0, 0.50, 3104 ± 0.003, 3.857 ± 0.004) have been measured. The spectroscopic factors for ^{17}F*(0, 0.50) are 0.94 and 0.83. Twostep processes appear to be involved in the excitation of ^{17}F*(3.10, 3.86). Angular distributions have also been measured at E(^{3}He) = 30 MeV (to ^{17}F*(5.1, 5.7)) and at E(pol. ^{3}He) = 33 MeV (d_{0}, d_{1}): see (1982AJ01) for references.
See (1982AJ01). See also (1984CL09; theor.) for reaction (f).
At E_{p} = 135.2 MeV differential cross sections are reported for the transitions to ^{17}F*(0, 0.5 ± 0.05, 4.84 ± 0.1, 5.89 ± 0.2, 6.34 ± 0.2, 7.26 ± 0.2, 7.64 ± 0.2, 9.3 ± 0.1, 14.3 ± 0.1). [Note known density of states.] The group to ^{17}F*(4.84) has Γ = 1.8 ± 0.05 MeV (1985PU1A). For a discussion of GamowTeller transition probabilites see (1985WA24). For A_{y} measurements see (1985PU1A, 1983PUZZ). For the earlier work see (1982AJ01).
Angular distributions have been studied at E(^{3}He) = 17.3 MeV [t_{0}, t_{1}] and at E(pol. ^{3}He) = 33 MeV [t_{0}]: see (1982AJ01).
See ^{17}Ne.
See (1983DE1A).
See (1977AJ02).
See (1985FI08). 