(See Energy Level Diagrams for 17O)
Q = -25.78 mb [see (1989RA17)].
Isotopic abundance = (0.038 ± 0.003)% (1984DE53).
For Coulomb excitation of 17O*(0.87) see (1982KU14).
Cross sections for populating 17O*(0.87) were measured at Ecm = 2.38, 2.89, 3.16 MeV by (1986CU02).
Cross sections for populating 17O*(0.87, 3.06, 3.84) were measured at Ecm = 2.22 - 3.23 MeV by (1986CU02).
Angular distributions have been studied for E(6Li) = 3 - 28 MeV [See (1982AJ01, 1986AJ04)]. More recently, differential cross sections at E(6Li) = 28 MeV were measured by (1986SM10). Many of the known levels in 17O were populated. See 17.11 (in PDF or PS). Hauser-Feshbach calculations and DWBA analyses were carried out for the data.
Angular distributions have been reported at E(9Be) = 16.1 - 20 MeV [see (1982AJ01)] and at E(9Be) = 12.0 - 27.0 MeV (1981JA09; α0, α2). For excitation functions see (1982AJ01, 1986AJ04), and see (1988GO1G).
Excitation functions at Ecm = 13.4 - 16.8 MeV and angular distributions at Ecm = 13.8 and 16.38 MeV have been measured by (1988JA14).
At Eα = 3.65 and 6.17 MeV [17O*(9.15, 11.08)] ΓαΓγ1/Γ = 0.65 ± 0.07 and 1.46 ± 0.13 eV, respectively. Assuming Γα/Γ = 0.45 for the lower resonance, Γγ1 for the E1 transition from 17O*(9.15) [Jπ = 1/2-] to 17O*(0.87) [1/2+] is 1.44 ± 0.26 eV. The parameters of 17O*(11.08) are discussed in 17.16 (in PDF or PS). See (1986AJ04).
The yield of neutrons increases monotonically for Eα = 0.475 to 1 MeV: for S(E) see (1977AJ02, 1982AJ01). Resonances observed in the yield of neutrons and through the anomalies in the elastic scattering are displayed in 17.12 (in PDF or PS). See also (1986AJ04). Cross sections for reaction (a) at Eα = 0.40 - 1.20 MeV were measured by (1989KEZZ). Distributions of alpha particle strength were obtained by (1988LE05). See also (1985CA41, 1987BU27).
A microscopic analysis of reactions (a) and (b) with the generator-coordinate method was carried out by (1987DE38).
Angular distributions are reported at E(6Li) = 35.5 MeV to 17O*(13.58 ± 0.02), which is strongly populated. Comparisons with 12C(6Li, d)16O*(16.29) and with the results of reaction 14 below suggest that the peak corresponding to 17O*(13.58) contains a state or states of spin 11/2-, 13/2-, or both, based on 16O*(16.29) (1978CL08). (d, α) angular correlations [E(6Li) = 26, 29 and 34 MeV] indicate the involvement of 17O states at 13.6 ± 0.1 [l= 6], 14.15 ± 0.1 , 15.1 ± 0.1 , 15.95 ± 0.15 , 16.6 ± 0.15 , 17.1 ± 0.15 , 19.6 ± 0.15 , 20.2 ± 0.15 , 21.2 , and 22.1 MeV, Γ ≈ 0.1, 0.5, 0.7, and 0.25 MeV for 17O*(14.2, 15.1, 16.0, 19.6, 20.2) (1978AR15). See, however, (1984CA39). For the earlier work see 17.7 (in PDF or PS) in (1977AJ02).
Measurements and analysis by (1987CA30) of data at E(6Li) = 34 MeV for deuteron peaks corresponding to 16O*(16.1, 13.6) indicated that the reaction proceeds by a direct alpha transfer process which populates doublets of interfering 17O levels.
Angular distributions are reported to 17O*(3.06) and to 17O*(13.58), which is preferentially populated (see discussion in reaction 13), at E(7Li) = 35.7 MeV. Narrow states at Ex = 14.86, 18.17 and 19.24 MeV are also strongly excited (1978CL08). See (1986AJ04) and for the earlier work see 17.6 (in PDF or PS) in (1977AJ02). Recent measurements of the cross section for Ec.m. = 1.46 - 6.48 MeV are reported in (1990DA03).
Cross sections for population of 17O*(0.87, 3.06, 3.84) were measured at Ecm = 2.76 - 4.82 MeV by (1986CU02).
States of 17O with Ex = 3.9, 5.2, 5.8 ± 0.1, 7.2, 7.6, 8.4 ± 0.06, 8.9, 9.8 ± 0.07, 10.55 ± 0.06, 12.1 ± 0.06, 13.3, 14.6 and 18.9 ± 0.14 MeV have been reported (1979BR04) at E(13C) = 105 MeV.
Angular distributions involving 17O*(0, 0.87) have been studied for E(16O) = 12 - 25 MeV: see (1977AJ02, 1982AJ01, 1986AJ04). See also (1989FR04). More recently, cross sections were measured for Ec.m. = 4.8 - 9.8 MeV by (1991DA05). A calculation involving application of the nuclear molecular-orbital model and Landau-Zener coupling effects is discussed in (1990IM01).
The capture cross sections at 90° for γ0 and for γ1 have been studied for E(3He) = 3.2 to 7.5 MeV and angular distributions of the γ-rays have been studied at the six observed resonances: see 17.13 (in PDF or PS).
At E(6Li) = 34 MeV angular distributions have been reported (1986AJ04) to 17O*(0,0.87, 3.06, 3.84, 4.55, 5.70, 6.36, 7.17 (u), 7.38 (u), 7.76, 8.20, 8.47 (u), 9.18 (u), 9.71, 9.87 (u), 10.42, 11.24, 11.82, 12.01, 12.27, 13.00 (u), 13.6 (u), 14.76 (u), 15.20, 16.3 (u)) (1981CU11, 1983CU02, 1983CU04; u = unresolved). (1983CU02) suggests evidence for two 3p-2h bands in 17O and (1983CU04) for analog states in 17N - 17O. See these two papers for spectroscopic factors.
The excitation functions for γ0 and γ1 have been measured for Et = 0.8 to 3.3 MeV: broad resonances are observed at 2.2 and 2.8 MeV in the γ0 cross section, and at 2.4 and 2.8 MeV in the γ1 cross section. Both also exhibit a structure at 1.5 MeV. The data are consistent with the states in 17.14 (in PDF or PS) and possibly with a state at ≈ 19.3 MeV (1980LI05). For the charged particle channels see (1977AJ02).
Angular distributions have been measured for 17O states with Ex < 7.6 MeV in the range Eα = 8.1 → 33.3 MeV: see a listing of the references in (1971AJ02). The sequential decay (reaction (b)) appears to take place via 17O states with 8.46 ≤ Ex ≤ 13.57 MeV. Those involved are believed to have J ≥ 5/2, Γα/Γ ≥ 0.6. See also the measurements at Eα = 48 MeV of (1987MIZY, 1988BRZY).
Angular distributions (a) and angular correlations (b) have been measured at E(6Li) = 36 MeV involving 17O*(8.48, 10.7, 12.0, 13.53, 14.88). Comparisons are made with the results in the analog reaction (6Li, t) involving states in 17F. See (1982AJ01, 1986AJ04).
Radiative capture cross sections (reaction (a)) have been measured for Ex = 25 - 40 MeV by (1986ANZL, 1988CO1D). Excitation functions have been measured for Ed = 0.5 - 5.9 MeV (b) and 0.3 - 6.3 MeV (reaction (c)): see (1977AJ02). Unresolved structures are observed in the neutron data. There is some evidence for structures at Ed = 1.8 MeV [p0, p1, p3] and 2.4 MeV [p2] [17O*(15.6, 16.2)]: see (1982AJ01). See also (1986AJ04) and 16N, 16O here.
Differential cross sections and analyzing powers for reaction (a) were measured for Ed = 88, 89 MeV by (1988SA19, 1988SAZY). Yield curves for reaction (b) have been measured for Ed = 0.8 to 2.7 MeV. Structures are reported at Ed = 1.06, 1.25 and ≈ 1.8 MeV. The latter has Γ ≈ 300 keV: see (1982AJ01).
At Eα = 45.4 MeV, the deuteron spectrum is dominated by the groups corresponding to states with Ex = 7.742 ± 0.020 and 9.137 ± 0.030 MeV. These states are assigned Jπ = (11/2-) and (9/2-) and arise from a dominant (d5/2)25p-11/2 configuration: see (1977AJ02).
The capture cross section for thermal neutrons is σcapt. = 202 ± 28 μb (1977MC05). See also (1981MUZQ). At thermal energies the branchings via 17O*(0.87, 3.05) are (18 ± 3) and (82 ± 3)%; Eγ = 870.89 ± 0.22 and 2184.47 ± 0.12 keV [the latter leads to Ex = 3055.43 ± 0.19 keV for 17O*(3.09); [see (1986AJ04)]. The cross section for two-photon emission σ2γ < 3 ± 19 μb for 1200 < Eγ < 2943 keV. The two-photon branching ratio is (1.6 ± 10) × 10-2 (1977MC05). The mechanism of p-wave neutron resonance capture was studied by measurements of gamma spectra from the En = 434 keV resonance (Ex = 4552 keV) by (1988KI02, 1992IG01). Partial radiative widths and off-resonance capture cross sections were obtained. See footnote b) in 17.17 (in PDF or PS) and see 2 (in PDF or PS) in the Introduction of this compilation.
The scattering length (bound) a = 5.805 ± 0.005 fm, σfree = 3.761 ± 0.007 b (1979KO26). See also (1981MUZQ). Resonances observed in the elastic scattering and in the (n, α) reaction are displayed in 17.17 (in PDF or PS). A two-channel R-matrix analysis finds that five states contain nearly 100% of the 1d3/2 strength and have their eigenenergy at Ex ≈ 5.7 MeV [the dominant state is 17O*(5.08)]. Spectroscopic factors are deduced for 26 states in 17O for 4.5 < Ex < 9.5 MeV [see 17.12 (in PDF or PS) in (1977AJ02)]: the sum of these factors is 1% for Jπ = 1/2+ , 5% for 1/2-, 12% for 3/2-, 99% for 3/2+, 0.1% for 5/2+, 1% for 5/2- and 14% for 7/2-. T = 3/2 resonances are discussed by (1981HI01): see 17.16 (in PDF or PS) and 17.17 (in PDF or PS). See also the review of neutron resonance spectroscopy by (1986WE1B).
Cross-section measurements are listed in 17.10 (in PDF or PS) of (1971AJ02) and in (1977AJ02, 1982AJ01). An optical model analysis of angular distributions leads to predictions of σR and σT for En = 6 to 19 MeV (1983DA22). Analyzing power measurements for n0 have been carried out at En = 5 - 23 MeV (1986AJ04). More recently scattering cross sections have been reported for En = 14.1 MeV (1986BAYL) and En = 21.6 MeV (1990OL01). Optical model parameters were deduced. Small angle scattering cross sections at En = 14.8 MeV are reported by (1992QI02). Neutron total cross section measurements from 160 to 575 MeV are reported by (1988FR23) from an experiment which included a test of charge symmetry. An experimental study of p-wave strength functions is described in (1988KO18).
A cascade statistical-model study of nucleon induced reactions in the range 50 MeV - 1 GeV is reported in (1990TA21). A resonating group study of the 16O + single nucleon problem is discussed in (1990HA38). See also the analyses reported in (1992KA21) and (1992KA41).
Neutron elastic-scattering observables were calculated on the basis of the relativistic impulse approximation by (1991KA22).
A number of resonances have been observed in the cross sections for production of 6.13 and (6.92 + 7.12) MeV γ-rays: see 17.13 (in PDF or PS) in (1977AJ02) and (1982AJ01). For cross-section measurements see 17.10 (in PDF or PS) in (1971AJ01) and (1977AJ02, 1982AJ01). Studies of circular polarization of gamma rays from inelastic scattering of partially polarized neutrons from a nuclear reactor are reported by (1988LI34). See also the measurements at En = 21.6 MeV and DWBA coupled channels analysis reported in (1990OL01).
See (1982AJ01). See also (1981HAZJ, 1982HA1A). Differential cross sections for neutron-induced reactions (a, b, c, d) have been measured for incident neutron energies of 27.4, 39.7, and 60.7 MeV by (1986RO1F, 1986SU15).
In a recent measurement of reaction (a) at En = 298 MeV, the Gamow-Teller and spin dipole strength functions were extracted (1991HI05).
17.17 (in PDF or PS) displays the results from a multilevel two-channel R-matrix analysis of the data from this reaction and from the elastic scattering of neutrons: see (1982AJ01). See also (1981HAZJ, 1982HA1A). More recently differential cross sections were measured for incident neutron energies of 27.4, 39.7, and 60.7 MeV by (1986RO1F, 1986SU15).
Angular distributions have been measured at Ep = 185 and 800 MeV [to 17O*(0, 0.87, 3.05)] [see (1982AJ01)], as well as at Ep = 154 to 185 MeV [for π+ to 17O*(0, 0.87)]. See (1986AJ04). More recently angular distributions and analyzing powers at Ep = 250, 354, 489 MeV were measured to 17O*(0, 5.22, 7.76, 15.78) by (1988HU02) and to 17O*(0, 5.22, 7.76, 14.20, 14.60) at Ep = 200 MeV by (1987AZZZ, 1988AZZZ). Studies of (p, π+) reactions to the Δ1232 region are described in (1988HU06).
A relativistic stripping model is applied to the 16O(p, π+)17O reaction and discussed in (1986CO20).
Observed proton groups are displayed in 17.14 (in PDF or PS) of (1977AJ02). Angular distributions have been measured at many energies in the range Ed = 0.3 - 698 MeV [see (1982AJ01, 1986AJ04)] and at Ed = 12.3 MeV (1990PI05). Reported level parameters are τm = 258.6 ± 2.6 psec [see 17.7 (in PDF or PS) in (1971AJ02)] and Ex = 870.749 ± 0.020 keV [Eγ = 870.725 ± 0.020 keV] for 17O*(0.87) and Γn = 97 ± 5 keV for 17O*(5.09): see (1982AJ01), and see (1988GU1E). Recent measurements at Ed = 12.3 MeV (1990PI05) determined high precision excitation energies for the first ten levels of 17O (see 17.10 (in PDF or PS)). For applications, see (1990CA32, 1992LA08).
Reaction (a) has been studied at E(7Li) = 36 MeV [see (1982AJ01, 1986AJ04)] and more recently at E(7Li) = 34 MeV (1988KE07). For reaction (b) see (1979CU1A, 1985CU1A) and the measurements at Ecm = 10.3, 12.8 MeV reported by (1988JA14). See also (1988WE17). For reaction (c) see (1982AJ01).
Monoenergetic photons with Eγ = 8.5 to 39.7 MeV have been used to measure the (γ, n) and the (γ, 2n) [above 10 MeV] cross sections. The giant dipole resonance, 6 MeV broad, is centered at 23 MeV; a pigmy resonance is also observed at 13 MeV. The pigmy resonance [Jπ = 3/2-] decays primarily to 16Og.s., (1986AJ04), and the work of (1985JU02) indicates that above Ex ≈ 17 MeV nearly all of the decay is to excited states of 16O. See, however, the experimental results of (1989OR07), which determine that the neutron emission from the 17O GDR to 16O is primarily to the ground state with ≈ 4% going to the 6.13 MeV 3- level. Four resonances have been inferred at Ex = 10.5, 14.0, 16.6 and 21.0 MeV with Jπ = 5/2-, 3/2-, 7/2-, and 7/2- respectively (1985JU02). Recent work of (1990MC06) reanalyzes earlier data and reports that the 17O levels at Ex = 14.4, 15.2 and 15.6 MeV should be assigned T = 1/2. Most of the GDR strength decays to T = 1 states in 16O: this implies a T = 3/2 assignment for the main part of the GDR (1986AJ04). A broad structure, of T = 1/2 nature, with 28 < Ex < 36 MeV is also reported (1980JU01). For radiative widths see 17.13 (in PDF or PS) in (1982AJ01). Measurements of bremsstrahlung-weighted integral cross sections for reaction (c) carried out by (1989OR07) indicated that 90% of the photoproton emission to 16N populates the ground state (2-) and the 0.298 MeV (3-) levels. More recently, the GDR was studied with reaction (c) using quasimonoenergetic photons from Eγ = 13.5 to 43.15 MeV (1992ZU01). Major peaks were observed at Eγ = 15.1, 18.1, 19.3, 20.3, 22.2, 23.1, 24.4 and ≈ 26.5 MeV.
Comparisons of 17O photonuclear data with shell model and continuum shell model calculations are discussed in (1987KI1C).
The 17O charge radius is reported to be < r2 >1/2 = 2.710 ± 0.015 fm (1978KI01). The r.m.s. radius of the 1d5/2 neutron orbit deduced from the data is 3.56 ± 0.09 fm (1982HI01). The elastic magnetic form factor was measured for 2.47 ≤ qeff ≤ 3.65 fm-1 by (1988KA08). Inelastic scattering is reported to a number of 17O states: see 17.18 (in PDF or PS) and 17.19 (in PDF or PS). Excited states in 16O up to Ex = 15 MeV were studied in high resolution at q = 0.8 - 2.6 fm-1 by (1987MA52). Recent form-factor measurements for momentum transfers q = 1.4 - 1.9 fm-1 at 90° and q = 1.7 fm-1 at 160°, for levels between Ex = 15 and 27 MeV, were reported by (1986MA48). See also footnote e in 17.10 (in PDF or PS). Note, however, the comments by (1987MI25) and reply by (1987MA40) concerning the spin assignments of (1986MA48). See also (1986AJ04) and reaction 50.
Calculations of charge and magnetic form factors in a consistent relativistic formalism are described in (1986KI10, 1986WA1D, 1991BL14). See also (1989FU05). Excitation energies, magnetic moments and M2 magnetic ground state transitions for five T = 3/2 excited states were calculated in a microscopic 2p-1h model by (1986TO13). Nuclear currents and amplitudes for elastic magnetic scattering in a relativistic mean-field theory were studied by (1987FU06, 1988FU04). A relativistic direct-interaction-based impulse approximation model is discussed in (1989GA04).
Model dependence of r.m.s. radii as determined from elastic magnetic form factors was studied by (1991CO12). See also (1991GO1F, 1991GO1G, 1992GO07). See also the study by (1992BO07) of 17O(e, e'n)16O as a tool for investigation of the role of two-body currents in quasi-free electron scattering.
At Eπ± = 164 MeV angular distributions to 17O*(3.85, 4.55, 5.22, 5.69, 7.76, 8.1, 8.4, 15.7, 17.1) have been analyzed by DWBA. Evidence is suggested for E2 strength near 8 MeV and for M4 strength to the two states at Ex = 15.7 and 17.1 MeV (1984BL17). [See, however, caveat on p. 1990 of that reference, and the density of states above Ex = 5 MeV in 17.10 (in PDF or PS).]
Angular distributions for the elastic scattering have been reported for Ep = 8.6 to 65.8 MeV and Ed = 18 MeV: see (1982AJ01). Analyzing power measurements for Ep = 89.7 MeV are reported in (1985VO12). For reaction (a) see also 18F in (1983AJ01, 1987AJ02).
A coupled-channels variational-method calculation has been applied to reaction (a) and is discussed in (1986KA1A).
Elastic angular distributions have been measured at E(3He) = 11.0 and 17.3 MeV [see (1977AJ02)], and at 14 MeV (1982AB04). Analyzing powers were measured at E(3He) = 33.3 MeV [see (1986AJ04); also Ay to 17O*(0.87)]. For reaction (b) see (1982AJ01, 1986AJ04). More recently, differential cross sections were measured at Eα = 54.1 MeV (1987AB03).
Microscopic spin-orbit potentials for polarized 3He scattering on 17O have been calculated (1987CO07) by a double folding model.
Elastic angular distributions (reactions (a) and (b)) have been reported at E(17O) = 30.5 to 33.8 MeV [see (1982AJ01)] and at E(17O) = 40 to 70 MeV (1986FR04; also 17O*(0.87)) and 85.4, 120 and 140 MeV (1982HE07). See also the comparison of reaction (a) with 16O + 13C by (1989FR04). For fusion cross section and yield measurements see (1982AJ01, 1986AJ04).
Results of a barrier-penetration calculation for these reactions is discussed in (1986HA13). The energy dependence of nucleus-nucleus potentials is explored in (1987BA01). Molecular single-particle effects are studied in an asymmetric two-center shell model in (1987MO27). See also (1988MI25). The origin of the resonant structure in reaction (b) is treated in (1988FR15). The nuclear Landau-Zener effect in reaction (a) is discussed in (1988TH02, 1988THZZ). Some features in inelastic scattering angular distributions that had been attributed to the existence of nucleon promotion are explained in terms of DWBA calculations by (1987VO05).
Angular distributions involving 17O*(0, 0.87) in reaction (a) have been studied at E(16O) = 22 to 32 MeV and E(17O) = 25.7 to 32.0 MeV [see (1977AJ02)] as well as at E(17O) = 22 MeV [see (1986AJ04)]. A model independent value of 0.82 ± 0.07 is obtained for the coupling constant of the 1d5/2 neutron in 17O. A review of magnetic electron scattering on 17O then leads to a spectroscopic factor S= 1.03 ± 0.07. This corresponds to (91 ± 7)% of the single-particle value [see (1982AJ01, 1986AJ04)]. For fusion cross sections see (1982AJ01) and (1986TH01). The elastic scattering angular distribution in reaction (b) has been reported at E(17O) = 36 MeV: see (1982AJ01, 1986AJ04).
Rotational coupling effects on nucleon molecular orbits in reaction (a) are studied in (1987IMZY, 1988IM02). See also (1987IMZZ). Subbarrier interactions are discussed in (1987PO11, 1988BE1W). Calculations of Gamow states in a realistic two-center potential are described in (1986MI22). Two-particle transfer is studied with a semiclassical approach in (1987MA22). Parity dependence in heavy ion collisions is discussed in (1986BA69).
Angular distributions (reaction (a)) have been measured at E(18O) = 20 and 24 MeV: see (1977AJ02). For S-factor measurements see (1977AJ02). Cross sections for reaction (b) are several orders of magnitude less than those for reaction (a) for E(18O)c.m. = 3 - 7.7 MeV: see (1977AJ02).
Observed α-groups are displayed in 17.14 (in PDF or PS) of (1977AJ02). Angular distributions have been measured at many energies in the range Ed = 0.3 to 27.5 MeV [see (1977AJ02)] and at Ed = 2.75 MeV [see (1986AJ04)].