(See Energy Level Diagrams for 15N)
Astrophysical questions:(1982BU1A, 1982CA1A, 1982WO1A, 1985PR1D, 1986FR1G, 1987AR1C, 1987AU1A, 1987LE1J, 1987ZI1C, 1988FE1A, 1988KR1G, 1988PI1C, 1988WA1I, 1989CH1X, 1989GU1Q, 1989GU1J, 1989GU1L, 1989JI1A, 1989KA1K, 1989KE1D, 1989ME1C, 1989NO1A, 1989WY1A, 1989YO1H, 1990HA1W, 1990RA1O).
Complex reactions involving 15N:(1985AR1H, 1985BE40, 1985HA1N, 1985PO11, 1985SI19, 1985UT01, 1986AI1A, 1986CH2G, 1986CO1Q, 1986GR1A, 1986HA1B, 1986MA13, 1986MA19, 1986ME06, 1986PO06, 1986PO15, 1986SA30, 1986SC28, 1986SO10, 1986TO10, 1986UT01, 1986VA23, 1987BA38, 1987BE1I, 1987BU07, 1987FE1A, 1987MI27, 1987NA01, 1987OL1A, 1987RI03, 1987ST01, 1987VI02, 1988AR1D, 1988GO11, 1988JO1B, 1988SA19, 1988UT02, 1989BA92, 1989GE11, 1989GRZQ, 1989KI13, 1989PA06, 1989SA10, 1989TE02, 1989YO02, 1990DA03, 1990GL01, 1990WE14).
Pion capture and reactions (See also reactions 1915, 43, and 46.): (1985LE1E, 1985MA1K, 1986BA1C, 1986SI11, 1987KA09, 1987LE1B, 1988LI23, 1988MI1K, 1988RO1M, 1988TA21, 1989CH31, 1989GE10, 1989JO07, 1989LE1L, 1990ER03, 1990OD1A, 1990TA1K).
Hypernuclei:(1984BO1H, 1985IA01, 1986AN1R, 1986DA1G, 1986DA1B, 1986FE1A, 1986GA1H, 1986KO1A, 1986YA1F, 1987MA2A, 1987MI38, 1987PO1H, 1987WU05, 1988MO1L, 1989BA92, 1989BA93, 1989DO1K, 1989KO1H, 1989MI30, 1989TA17).
Ground-state properties of 15N:(1985AN28, 1985AR11, 1985BL20, 1985GO1A, 1986BA04, 1986BA49, 1986MC13, 1986WI03, 1986WUZX, 1987DE03, 1987FU06, 1987IC02, 1987KI1C, 1987MI27, 1988AR1B, 1988AR1I, 1988CH1T, 1988DE09, 1988FU04, 1988KE1B, 1988NI05, 1988SH07, 1988VA03, 1988WA08, 1988WO04, 1989CH24, 1989FU05, 1989GOZQ, 1989NE02, 1990SA10, 1989WO1E, 1990VA1G, 1990VA01).
μ = -0.283188842 (45) nm (see (1989RA17))
Natural abundance:(0.366 ± 0.009)% (1984DE53).
15N*(5.27):μ = +(2.35 ± 0.18) nm (see (1989RA17)).
Thick target neutron yields are reported at E(6Li) = 40 MeV (1987SC11). The yield of p0 and p1 (reaction (b)) for E(6Li) = 3.84 to 6.40 MeV shows some broad structure: analysis in terms of Ericson fluctuation theory gives a value of ~ 0.4 MeV for the average level width at Ex = 28 MeV in 15N. The excitation functions for t0 (reaction (c)), α0, α1 and α2 (reaction (d)) show broad structures for E(6Li) = 4 to 14 MeV. See (1976AJ04) for the references.
See (1985MC1C; applied).
See (1988GO1H; E(12C) = 65 MeV; prelim.).
At E(6Li) = 4.9 MeV, thirty proton groups are observed corresponding to 15N states with Ex < 16.8 MeV. Angular distributions have been measured for the proton groups corresponding to 15N*(5.27 + 5.30, 6.32, 7.16 + 7.30, 7.57, 8.31, 8.57, 9.05 + 9.15): see (1976AJ04).
At E(7Li) = 24 MeV angular distributions have been studied to many of the 15N states with Ex < 15.5 MeV: see (1981AJ01).
The 90° differential cross section for γ0 production has been measured for Eα = 5.74 to 18.0 MeV: see (1981AJ01, 1986AJ01). For the observed resonances see Table 15.6 (in PDF or PS). See also (1988WAZY; prelim.).
Reported resonances are displayed in Table 15.7 (in PDF or PS). Nine resonances have been observed in the total cross section for reaction (a) in the range Eα = 0.55 to 2.40 MeV (1988WAZY; prelim.) [astrophysical reaction rates will be derived]. For thick target neutron yields for Eα = 1.0 to 9.8 MeV, see the review in (1989HE04). See also (1987EL1B; applied).
The total cross section for reaction (b) has been measured for Eα = 0.9 to 1.7 MeV: resonance information is deduced by (1987TU01). At higher energies (to 25 MeV) the p0 excitation functions show broad features: see (1981AJ01).
At E(6Li) = 34 MeV angular distributions are reported to the states with 5.3 < Ex < 16.3 MeV: this reaction appears to be less selective than reaction 11. The most strongly populated states are 15N*(9.2, 10.5, 10.7, 13.1, 14.8, 15.5). See (1981AJ01). See also (1990AZZZ).
At E(7Li) = 24 and 34 MeV, angular distributions to states with 5.3 < Ex < 15.6 MeV have been measured: 15N*(9.8, 10.5, 10.7, 15.4, 15.5) are particularly strongly populated at 34 MeV. Jπ = 9/2+, 9/2, 11/2, 9/2, 11/2, 13/2, 15/2 are suggested for 15N*(10.69, 12.56, 13.03, 13.19, 13.84, 14.11, 15.37). Only 15N*(15.52) appears to have a large cluster component corresponding to 11B + α. See (1981AJ01). For a study of the γ-decay, see (1981AJ01). At E(7Li) = 34, 40, 45 and 55 MeV states at Ex = 13.88, 17.10, 18.67, 18.81, 19.70, 19.93 and 22.86 MeV are reported to be strongly populated (1990AZZZ; prelim.). See also (1990DA03).
Angular distributions have been measured at E(16O) = 27 to 60 MeV involving the two proton-hole states of 15N[15N*(0, 6.32); Jπ = 1/2-, 3/2-] and 12C*(0, 4.4, 9.6): see (1976AJ04). See also (1989KA1N; theor.).
The 90° excitation function for γ0 in the range 1.0 to 6.5 MeV [see (1981AJ01, 1986AJ01)] shows one very strong resonance (at peak, 4.4 ± 0.5 μb/sr) corresponding to 15N*(16.7) as well as two other strong (unresolved and/or broad) resonances at Et ~ 3.3 and 6 MeV: Table 15.8 (in PDF or PS) shows the derived parameters. Table 15.8 (in PDF or PS) also displays the structures observed in reactions (b) → (e). At Epol. t = 17 MeV the polarization and analyzing power for the transition to 14Cg.s. (reaction (c)) are shown to be the same, as required by the conservation of parity. The VAP for the elastic scattering (reaction (d)) has been measured at Et = 9 and 11 MeV: see (1985AJ01). See (1981AJ01) for the earlier work. See also (1985SA31, 1990HA46; theor.).
Individual states have not been resolved in this reaction. The cross section over the bound states of 15N is < 0.03 nb at Eπ+ = 5 MeV and 0.8 ± 0.2 nb at Eπ+ ~ 60 MeV [E(3He) = 170.2 and 236.3 MeV, respectively] (1988HO15). For the earlier work see (1984BI08, 1986SC23).
Angular distributions have been measured at many energies for Eα = 13.4 to 96.8 MeV: see (1976AJ04, 1981AJ01, 1986AJ01). See also (1987MIZY, 1988BRZY; Eα = 48 MeV; prelim.), (1987BI1C; Eα = 218 MeV; prelim.) and (1989BR1J).
Observed 3He groups are displayed in Table 15.9 (in PDF or PS) of (1981AJ01). Comparisons of the angular distributions obtained in this reaction at E(6Li) = 60.1 MeV and in the (6Li, t) reaction shows analog correspondence for the following pairs of levels: 5.27 - 5.24, 7.16 - 6.86, 7.57 - 7.28, 8.57 - 8.28, 10.80 - 10.48, 13.15(u) - 12.84, 15.49(u) - 15.05 [first listed is Ex in 15N-second in 15O]. [Ex are nominal; u = unresolved.] For γ-decay measurements see Table 15.5 (in PDF or PS). See also (1990AZZZ).
Observed α-groups are shown in Table 15.9 (in PDF or PS). Angular distributions have been measured to E(7Li) = 48 MeV. Comparison of spectra from this reaction (E(7Li) = 34.9 MeV) with those from 13C(6Li, α) (reaction 26) lead to configurations of (d)3 for 15N*(10.7, 12.57, 13.20, 15.42) and suggest that 15N*(12.57, 13.20) have lower J than 15N*(10.7, 15.5), probably J ≤ 7/2. 15N*(13.02) is shown to be p(d)2 in aggreement with Jπ = 11/2-: see (1981AJ01).
15N*(9.155) [J = 5/2] decays to 15N*(5.30) [J = 1/2+] by an E2 transition; therefore its parity is positive. It has a large triton cluster parentage. This is not true of 15N*(9.152): see (1981AJ01). For γ-decay measurements see Table 15.5 (in PDF or PS). See also (1985SA31; theor.).
The 90° - 95° yields of γ0 have been measured for Ed = 1 to 10 MeV: observed resonances are displayed in Table 15.10 (in PDF or PS). The γ-ray angular distributions are consistent with the emission of predominantly E1 radiation except for evidence of M1/E2 transitions in the region Ex = 20 - 21.5 MeV: see (1981AJ01). See also (1990HA46).
Observed resonsnces are displayed in Table 15.10 (in PDF or PS). Polarization measurements have been carried out at Epol. d = 12.3 MeV (reaction (a)) and 13 and 56 MeV (reaction (b)): see (1986AJ01). See also (1987AB04). For VAP measurements (reaction (c)) at Epol. d = 70 MeV to 13Bg.s. see (1986MO27).
Excitation functions for elastically scattered deuterons have been measured in the range Ed = 0.4 to 5.7 MeV: see (1976AJ04). Polarization studies have been reported for Ed = 12.5 to 15 MeV and at Epol. d = 56 MeV: see (1981AJ01, 1986AJ01).
At Eα = 34.9 MeV a ZRDWBA analysis has been made of the angular distributions to 15N*(5.27, 5.30, 7.16, 7.30, 7.56, 8.31, 8.57, 9.05, 9.15, 10.07, 10.53, 10.69, 11.43, 11.94, 12.10, 12.33, 12.49, 12.56, 13.00, 13.83, 14.08). L = 0 for the group(s) to 15N*(9.15, 10.69); L = 2 for 15N*(12.56); L = 3 for 15N*(5.27, 7.16, 7.56); L = 4 for 15N*(11.94, 13.00); L = 1 for the remaining transitions (1984YA03). See also Table 15.11 (in PDF or PS) of (1976AJ04).
Angular distributions have been measured at E(6Li) = 32 MeV to 15N*(0, 5.30, 6.32, 7.16, 7.30, 7.57, 8.31, 8.57, 9.15, 9.23, 9.83, 10.07, 10.70, 11.94, 13.00): the results are consistent with the previously known Jπ, with (odd) parity for 15N*(9.83) and with Jπ = 9/2- for 15N*(11.94): see (1981AJ01).
Observed resonances are displayed in Table 15.11 (in PDF or PS); the branching ratios are shown in Table 15.5 (in PDF or PS). Narrow anamolies (in the γ0 yield for Ep = 2.8 to 30 MeV) are reported at Ep = 10.0, 11.0, 12.35, 13.6, 16.4 MeV. A good fit to the total cross section (Epol. p = 7.5 to 19 MeV) is obtained with the GDR split into peaks at Ex = 21.0 and 25.5 MeV with Γ = 6 and 2 MeV, respectively. The integrated E2 cross section for Ex = 19.5 to 27.0 MeV is (6.8 ± 1.4)% of the isoscalar sum rule. The reaction thus shows no sign of a collective E2 resonance in that Ex region. [Another study shows no appreciable E2 strength concentration for Ex = 14.3 to 23.3 MeV.] Above the GDR region the 90° γ0 cross section decreases smoothly with energy except for a small peak which would correspond to 15N*(37.0). See (1981AJ01, 1986AJ01) for the references. See also (1985CA41, 1988CA26, 1990GO25; astrophysics) and (1990HA46; theor.).
Observed resonances are displayed in Table 15.11 (in PDF or PS). Cross sections have recently been measured for Ep = 0.67 to 1.20 MeV (1989KEZZ; prelim.). Polarization measurements are reported at Epol. p = 160 MeV (1984TA07, 1987RA15; Ay; DNN(0°); n to 14N*(0, 2.31, 3.95, 13.72)). Forward-angle differential cross sections have been measured at Ep = 200, 300, (400), 450 MeV (1986AL18, 1989AL04; n1 + n2) and at 492 MeV (1989RA09; n1, n2). See (1986AJ01) for the earlier work. See also (1985TA23), (1986TA1E, 1987TA22, 1989SU1J), (1985CA41, 1988CA26; astrophysics) and (1987BE1D, 1987LO1D; theor.).
Angular distributions have been measured for Ed = 1.3 to 6.5 MeV: see (1976AJ04).
See (1988AL1G); E(7Li) = 27 MeV; prelim.).
Observed γ-rays from thermal neutron capture are displayed in Table 15.12 (in PDF or PS). See also Table 15.5 (in PDF or PS). The 90° γ0 yield and angular distributions have been measured for En = 5.6 to 15.3 MeV. The cross section shows two prominent dips at Ex = 16.7 and 18.1 MeV [compare with 14N(p, γ); reaction 9 in 15O] and broad structures at Ex ~ 17 and 19 MeV. The angular distribution data are consistent with essentially pure E1 radiation in the region Ex = 17 to 24 MeV (1982WE01). See also (1989WO1C) and (1989GU1J; astrophys.).
The scattering amplitude (bound) a = 9.37 ± 0.03 fm, σfree = 10.05 ± 0.12 b, σspininc (bound nucleus) = 0.49 ± 0.11 b (1979KO26). Observed resonances are displayed in Table 15.13 (in PDF or PS): for a discussion of the evidence leading to Jπ assignments see (1959AJ76). Cross section curves and a listing of references can be found in (1988MCZT). Recent measurements are reported at En = 0.14, 1.3 and 2.1 MeV (1988KO18; σt), 7.67 to 13.50 MeV (1986CH2F; el and inel; prelim.). 10.96, 13.96 and 16.95 MeV (1985TE01; elastic). The (n, n'γ) cross section has been measured for En = 2.5 to 3.5 MeV (1989STZW; prelim.; applied). Analyzing powers for the n0 group have been measured for Epol. n = 10 to 17 MeV (1989LI26). See also 14N, (1988BA55, 1986LI1M) and (1988MA1H).
(1989KO11), using the "white" neutron source LANSCE, have measured the (n, p) cross section from 61 meV to 34.6 keV. Their results support the role of this reaction as a "poison" during s-process nucleosynthesis. [See (1989KO11) for a discussion of other measurements.] See also (1988BR17, 1989KEZZ). For a display of the measured cross sections for (a) and (c), see (1988MCZT). See also (1988SUZY; En = 5.0 to 10.6 MeV; σ = 11 to 30 mb; prelim.) for reaction (c) and (1988MA1H). For resonances in reactions (a) and (e), see Table 15.13 (in PDF or PS). (1986SU15) report double-differential cross sections at En = 27.4, 39.7 and 60.7 MeV for all five reactions. See also (1989CH2E).
At Epol. p = 200 MeV, angular distributions and Ay have been measured for the transitions to 15N*(0, 6.32, 8.31) as well as for a number of unresolved transitions. A sharp group at Ex = 21.5 MeV is suggested to correspond to a 15/2- state (1988AZ1D, 1987AZZZ; Ph.D. thesis and abstract).
Proton groups (and γ-rays) from this reaction are displayed in Table 15.15 (in PDF or PS) of (1981AJ01). The results include Ex = 7567.1 ± 1.0 keV for 15N*(7.57). Newer values, derived from measurements of proton groups in a spectrograph, are 5270.2 ± 1.3, 6324.0 ± 1.0, 7154.85 ± 0.17, 7300.80 ± 0.09, 7563.25 ± 0.19, 8312.79 ± 0.12, 8571.53 ± 0.25, 9050.24 ± 0.33, 10064.34 ± 0.31 and 11235.5 ± 0.5 keV (1990PI05). Angular distributions have been meausred for Ed = 0.32 to 52 MeV and lead to ln, Jπ and spectroscopic factors: see Table 15.15 (in PDF or PS) in (1981AJ01). Branching ratios and multipolarities are shown in Table 15.15 (in PDF or PS). See also (1985LI1H, 1985ME1E, 1987SI1D, 1988LI1E, 1988VI1A, 1989VI1E; appliactions).
The total photoneutron cross section from threshold to 38 MeV shows a very broad GDR which extends from ~ 16 to 30 MeV. Maxima are observed at Eγ ~ 23.5 and 25.5 MeV (σ ~ 11 mb): see (1988DI02) [based on (1982JU03; monoenergetic photons)]. However, (1989BA25) report a sharper single peak at Eγ = 25.5 MeV in the (γ, Sn) reaction with a cross section of ~ 16 mb. See (1989BA25) for a discussion of the T< and T> components of the GDR.
The (γ, n0) cross section for Ex = 13 to 24 MeV shows a broad structure centered at Ex ~ 14.5 MeV and a resonance at Ex = 17.3 ± 0.1 MeV. A large fraction of the photoabsorption strength leading to 14Ng.s. is due to the formation of 3/2+, T = 1/2 states in 15N which decay by d-wave emission. The absorption is essentially pure E1 (1983WA03). See also (1981AJ01).
The (γ, 2n) reaction has been studied from threshold to 38 MeV [see (1988DI02)] and more recently from 20 to 28 MeV by (1988MC01). The cross section remains near zero for 3 MeV above threshold and then rises sharply at about 24 MeV to a maximum value of 1.7 mb (1988MC01) [see, however, (1982JU03)]. For discussions of the results in terms of the density of T> states in 14N, see (1988MC01, 1989BA25 (p.511)).
For discussions of the (γ, p) reaction see (1981AJ01) and (1989BA25). The latter show a curve for the total absorption cross section [(γ, n) + (γ, p)] from 10 and 27 MeV dominated by a peak (see above) at Eγ ~ 25 MeV with σ ~ 23 mb.
A study at Ee = 18.8, 20.8, 25.7 and 29.7 MeV (reaction (d)) shows a "pigmy" resonance at Ex = 14.8 MeV, a shoulder at 15.6 MeV, a peak at 16.7 MeV [probably 1/2+ but 3/2+ is not ruled out], and the giant dipole resonance, which exhibits a great deal of structure, centered at 22 MeV. The data on the pigmy resonance are consistent with an admixture of ~ 1% 3/2- (E2) or 1/2- (M1) to a predominantly 1/2+ (E1) state. The experiment shows that for 14 < Ex < 28 MeV the reaction goes predominantly via 1/2+ or 3/2+ (E1) states in 15N; the T = 3/2 strength is concentrated above 18 MeV: see (1981AJ01).
The cross section for for d0 [reaction (e)] is reported at 90° for Eγ ~ 20.5 to 28.5 MeV: a resonance is observed at Ex ~ 21.9 MeV. The (γ, t0) cross section (reaction (f)) at 90° decreases from a value of 30 μb/sr at 20 MeV to 5 μb/sr at 22 MeV and remains flat out to 25 MeV. Comparison of this cross section, and those of the other photonuclear reactions, suggest an isospin splitting of ~ 6 MeV with the T = 1/2 strength concentrated between 16 and 21 MeV and the T = 3/2 strength between 21 and 28 MeV. 15N*(21.9) is not observed. See (1981AJ01) for references. For reaction (g) [to 15Og.s.] see (1988LI23, 1989KO28). See also (1985GO1A, 1987KI1C; theor.).
The charge r.m.s. radius of 15N is 2.612 ± 0.009 fm. The C0 elastic scattering form factor of 15N has been measured over q = 0.4 - 3.2 fm-1 (1988DE09). Inelastic groups are displayed in Table 15.15 (in PDF or PS).
The giant resonance is split into two main peaks at Ex = 22 and 25.5 MeV with some structure around 20 MeV. Γγ0(C1) = (1.1 ± 0.3) × 103 eV (14 - 18.5 MeV), Γγ0(C2) = 12.5 ± 2.0 eV assuming the states responsible are 3/2+ and 3/2-, respectively. For Ex = 18.5 to 30 MeV, Γγ0(C1) = (1.96 ± 0.04) × 104 eV while Γγ0 < 0.1 eV for any C2 strength. See (1981AJ01, 1986AJ01) for references. See also (1988MUZV; (e, e'γ); prelim) (1986PA1C, 1987DE43, 1988LI23, 1988PA1S, 1989KO28, 1990PA1H) and (1986JE1B, 1987DO12, 1988FU04, 1988GOZM, 1988SH07, 1989FU05, 1989WO1E, 1990BL09, 1990FU04; theor.).
At Eπ± = 164 MeV angular distributions have been studied to states at Ex = 10.68 ± 0.03, 12.52 ± 0.02, 14.04 ± 0.03 and 17.19 ± 0.03 MeV: Jπ = 9/2+, 9/2+, (9/2+, 7/2+) and (9/2+, 7/2+), respectively, as well as to the 15Ng.s.. Additional π+ cross sections were measured at 120 and 260 MeV: peaks were observed at Ex = 20.11 ± 0.06 and 23.19 ± 0.06 MeV [both are probably T = 3/2 states]. 15N*(5.27, 6.32, 7.57) were also populated (1985SE06). At Eπ+ = 164 MeV, elastic scattering has been studied from 15pol. N: Ay for θ = 60° - 100° is consistent with zero (1989TA21, 1990TA1L). See also (1990TAZS) and (1988GOZM; theor.).
Angular distributions of elastically scattered protons have been measured at Ep to 44.2 MeV: see (1981AJ01, 1986AJ01). For measurements of Ky'y at Epol. p = 65 MeV see (1990NA15). See also 16O in (1986AJ04) and (1990DU01; theor.).
Angular distributions of elastically scattered deuterons have been measured at Ed = 5 - 6 MeV. Elastic and inelastic 3He distributions have been studied for E(3He) = 11 to 39.8 MeV: see (1976AJ04). Elastic distributions and Ay have also been measured at E(pol. 3He) = 33 MeV (1986DR03).
At Eα = 40.5 MeV, a number of particle groups have been observed and angular distributions have been measured: see Table 15.17 (in PDF or PS) of (1976AJ04). At Eα = 48.7 and 54.1 MeV elastic angular distributions have been reported by (1987AB03). See also (1981AJ01) for additional information and (1985SH1D; theor.).
The elastic scattering has been studied at E(7Li) = 28.8 MeV: see (1986AJ01).
Angular distributions of elastic scattering have been measured at E(15N) = 31.5 to 47 MeV [reaction (a)] and E(13C) = 105 MeV [reaction (b)]: see (1981AJ01, 1986AJ01) [also for yield measurements]. See also (1986HA1F, 1989BEZC) and (1985HU04, 1986BA69, 1986HA13; theor.).
Elastic angular distributions have been measured at E(16O) = 35.1 and 42.6 MeV: see (1986AJ01). For fusion cross sections and yields see (1976AJ04, 1986AJ01) and (1985NO1C, 1986HA1F). See also (1985HU04; theor.).
Over the giant resonance region in 16O, the decay takes place to the odd-parity states 15N*(0, 6.32) and less strongly to the even-parity states 15N*(5.27, 5.30, 8.31, 9.05) and to 15N*(9.22): see (1970AJ04, 1976AJ04). At Ee = 500 MeV most of the 1p hole strength is concentrated in the groups to 15N*(0, 6.32). The 1s state shows up as a very wide asymmetric structure centered at Ex ~ 41 MeV: see (1981AJ01). See also (1990LE1P). In the range Eγ = 101.5 to 382 MeV differential cross sections are reported for the p0, (p1+2) and p3 groups at θ = 45°, 90° and 135° (1985LE07). Differential cross sections have also been measured at Eγ = 196, 257, 312, 316 MeV for the p0 and p1 → 3 groups [the latter not at 316 MeV] (1988AD07, 1985TU02). 15N*(0, 6.3, 10.8) have been populated at Ee = 500 MeV (1982BE02). See also (1986AJ01), (1987VOZR, 1988LEZW, 1989LEZY; prelim.), (1987MA1K) and (1985CA17, 1985GO1B, 1986CH05, 1986LU1A, 1986PO14, 1987RY03, 1988CA10, 1988DUZX, 1988HO10, 1988YA08, 1988LO07, 1988MC03, 1988RY03, 1989RY01, 1990BRZY, 1990FL1A, 1990OWZZ; theor.).
Gamma rays from the decay of one of the states at 5.3 MeV and from 15N*(6.3) are reported by (1983VA1E).
At Eπ± = 240 MeV, the spectra are dominated by 15N*(0, ~ 6.5). The π+/π- ratio has been measured for the ground-state transitions (1984KY01). At Eπ+ = 2.0 GeV/c differential cross sections have been determined for the transition to 15N*(6.3) (1983KI01).
At Ep = 505 MeV the summed proton spectrum shows two peaks corresponding to the knockout of p1/2 and p3/2 protons with binding energies of 12.12 and 18.44 MeV [15N*(0, 6.32)]. Differential cross sections and (p, 2p)/(p, pn) ratios are also reported (1986MC10). For work at 1 GeV involving the knockout of s1/2 protons see (1985BE30). For γ-ray production (15N*(5.27)) at Ep = 30 - 40 MeV see (1988LE08). See also (1985KI1A, 1986CH1J, 1987VD1A), (1987LA11, 1988LE08; astrophys.) and (1986BO1A; theor.). For earlier work see (1976AJ04).
Angular distributions of 3He groups have been measured for Ed = 20 to 82 MeV: see (1976AJ04, 1981AJ01). The spectra are dominated by the transitions to 15N*(0, 6.32). A ZRDWBA analysis leads to C2S = 2.25 and 3.25 for these two states [and to 2.37 and 3.31 for the analog states in 15O studied with the (d, t) reaction]. Jπ = 3/2- for both 15N*(9.93, 10.70): see (1981AJ01). See also (1987MO03) for a re-analysis of C2S.
At Eα = 139.2 MeV the absolute spectroscopic factors S = 5.4 and 6.9 for 15N*(0, 6.32) (1987SA01).
Angular distributions of α0 have been measured for Ep = 0.125 to 42.2 MeV: see (1976AJ04, 1981AJ01) and 19F in (1987AJ02). At Ep = 40.9 MeV angular distributions have also been studied to 15N*(0, 5.27 + 5.30, 6.32, 7.57, 9.15[u], 9.83[u], 10.7[u], 11.24[u], 11.44, 12.52[u] (1987CA15; see for C2S).