A=9Be (1984AJ01)

1. (a) ⁶Li(t, n)⁸Be Q_m = 16.0223 E_b = 17.6878
(b) ⁶Li(t, p)⁸Li Q_m = 0.801
(c) ⁶Li(t, d)⁷Li Q_m = 0.9929
(d) ⁶Li(t, α)⁵He Q_m = 15.22
(e) ⁶Li(t, n)⁴He⁴He Q_m = 16.1141
(f) ⁶Li(t, 2n)⁷Be Q_m = -2.876

The 0° differential cross section for reaction (a) increases monotonically between E_t = 0.10 and 2.4 MeV except for a resonance at E_t = 1.875 MeV (⁹Be* = 18.937). The excitation function for ⁸Li (reaction (b)) increases monotonically for E_t = 0.275 to 1.000 MeV. In the range E_t = 2.0 to 6.8 MeV, a broad peak [Γ ≈ 1.3 MeV] is observed at E_t = 4.57 MeV [E_x = 20.73 MeV]: see (1974AJ01) for references. For reaction (d) see (1982CE1C). Cross sections for ⁷Be production [reaction (f)] (E_t = 4.4 to 11.99 MeV) are reported by (1980GU26). For reactions (c) and (e) see (1966LA04).

2. ⁶Li(³He, π⁺)⁹Be Q_m = -121.898

See (1981BI1F, 1982LE1L).

3. ⁶Li(α, p)⁹Be Q_m = -2.1262

Angular distributions of p₀ have been measured at E_α = 10.2 to 14.7 MeV and at 30 MeV: see (1974AJ01). See also (1983BE1P; theor.).

4. ⁷Li(d, γ)⁹Be Q_m = 16.6950

For E_d = 0.1 to 1.1 MeV, a resonance in the yield of capture γ-rays is observed at E_d = 361 ± 2 keV, corresponding to ⁹Be*(16.975) with Γ_c.m. < 0.47 keV. The small width of this state and its energy correspondence with ⁹Li*(2.69) argue for T = 3/2. The angular distribution of the γ-rays to ⁹Be(0) is isotropic to within 7%: see (1974AJ01) for references.

5. (a) ⁷Li(d, n)⁸Be Q_m = 15.0296 E_b = 16.6950
(b) ⁷Li(d, α)⁵He Q_m = 14.23
(c) ⁷Li(d, n)⁴He⁴He Q_m = 15.1213
(d) ⁷Li(d, 2n)⁷Be Q_m = -3.869

The yield of neutrons has been measured for E_d = 0.2 to 23 MeV: observed resonances are displayed in Table 9.3 (in PDF or PS). For polarization measurements [E_d = 0.64 MeV and 2.5 to 3.7 MeV] see (1974AJ01). See also (1979SE04; theor.).

The yields of α-particles have been measured for E_d = 0.25 to 0.75 MeV (1977RO1C; α₁) and 0.2 to 3.0 MeV: see Table 9.3 (in PDF or PS). For reaction (c) see (1974AJ01) and ⁵He. The ⁷Be production cross section (reaction (d)) has been studied for E_d = 5.38 to 11.94 MeV (1980GU26). See also (1978BA1F, 1979JO1B; applications).

6. ⁷Li(d, p)⁸Li Q_m = -0.192 E_b = 16.6950

Excitation functions have been measured for E_d = 0.29 to 7 MeV [see (1974AJ01, 1979AJ01)] and 0.60 to 1.2 MeV (1982EL03, 1982FI03; σ_t) and 0.7 to 3.4 MeV (1979MI1E; σ_t): observed resonances are displayed in Table 9.3 (in PDF or PS). Recent measurements of the total cross section at the E_d = 0.78 MeV resonance are 181 ± 8 mb (1976SC14), 174 ± 16 mb (1979MI1E), 146 ± 13 mb (1982EL03) and 148 ± 12 mb (1982FI03): we adopt 147 ± 9 mb. See also (1983FI01). For earlier values see (1974AJ01). This cross section serves as normalization for the ⁷Be(p, γ)⁸B data and to calculations of the S-factor. The new value predicts that the neutrino-capture rate in ³⁷Cl should be decreased by about 15%.

Polarization measurements are reported at E_d = 4 MeV (1982WAZS). See also (1980HU1D, 1982AB1D) and ⁸Li.

7. ⁷Li(d, d)⁷Li E_b = 16.6950

The elastic scattering [E_d = 0.4 to 1.8 MeV] shows a marked increase in cross section for E_d = 0.8 to 1.0 MeV (perhaps related to ⁹Be*(17.30)) and a conspicuous anomaly at E_d = 1.0 MeV, due to p-wave deuterons [⁹Be*(17.50)]. The elastic scattering has also been studied for E_d = 1.0 to 2.6 MeV and 10.0 to 12.0 MeV: see (1979AJ01). See also (1982AB1D) and ⁷Li.

8. (a) ⁷Li(d, t)⁶Li Q_m = -0.993 E_b = 16.6950
(b) ⁷Li(d, ³He)⁶He Q_m = -4.481

The cross section for reaction (a) rises steeply from threshold to 95 mb at E_d = 2.4 MeV and then more slowly to ≈ 165 mb at E_d = 4.1 MeV. The t₀ yield curve (θ_lab = 155°) decreases monotonically for E_d = 10.0 to 12.0 MeV: see (1974AJ01). See also ⁶Li. For reaction (b) see ⁶He.

9. ⁷Li(³He, p)⁹Be Q_m = 11.2015

Observed proton groups are listed in Table 9.4 (in PDF or PS). The parameters for the particle and γ-decay of observed states are displayed in Tables 9.5 (in PDF or PS) and 9.6 (in PDF or PS). Angular distributions have been reported in the range E(³He) = 0.9 to 14 MeV: see (1974AJ01, 1979AJ01). See also (1981SL03), (1981VI1B) and ¹⁰B.

The γ-decay of ⁹Be*(14.39) [J^π = 3/2^-; T = 3/2] has been measured by (1978DI08) and compared with the decay from the mirror state in ⁹B: see Table 9.6 (in PDF or PS). No evidence is found for violation of the selection rule for ΔT = 1 mirror γ transitions (1978DI08).

10. ⁷Li(α, d)⁹Be Q_m = -7.1517

Angular distributions of d₀, d₁ and d₂ are reported at E_α = 30 MeV: see (1974AJ01). See also (1980ZE05, 1983BE1P; theor.).

11. ⁷Li(⁶Li, α)⁹Be Q_m = 15.220

Angular distributions of α₀ have been studied at E(⁷Li) = 3.78 to 5.95 MeV: see (1974AJ01).

12. ⁹Li(β^-)⁹Be Q_m = 13.606

⁹Li decays by β^- emission with τ_1/2 = 178.3 ± 0.4 msec to several ⁹Be states: see (reaction 1 in ⁹Li and Table 9.7 (in PDF or PS). Measurement of β-α coincidences involving ⁹Be*(11.28) show contributions from the direct n + 2α breakup process as well as the sequntial n-emission to ⁸Be*(2.9) [J^π = 2⁺], followed by breakup into 2α (1981LA11, 1981NY1A). The branching ratio fop the ⁹Be*(2.43) → ⁸Be_g.s. + n decay is (6.4 ± 1.2)%. ⁹Be*(2.78) [J^π = 1/2^-] decays mainly to ⁸Be_g.s. + n presumably by p-wave neutron emission: see (reaction 13 in (1979AJ01). See also (1981JOZV) and (1979DE15; theor.).

13. (a) ⁹Be(γ, n)⁸Be Q_m = -1.6655
(b) ⁹Be(γ, α)⁵He Q_m = -2.46
(c) ⁹Be(γ, n)⁴He⁴He Q_m = -1.5737

The photoneutron cross section has been measured from threshold to 320 MeV: see Table 9.6 (in PDF or PS) in (1966LA04) and (1979AJ01). A pronounced peak occurs ≈ 29 keV above threshold with σ_max = 1.33 ± 0.24 mb. The shape of the resonance has been measured very accurately for E_γ = 1675 to 2168 keV. The FWHM of the peak is estimated to be 100 keV (1982FU11). See also (1983BA52; theor.). The cross section then decreases slowly to 1.2 mb at 40 keV above threshold. From bremsstrahlung studies, peaks in the (γ, Tn) cross section are observed corresponding to E_x = 1.80 and 3.03 MeV. At higher energies, using monoenergetic photons, the (γ, Tn) cross section is found to be relatively smooth from E_γ = 17 to 37 MeV with weak structures which correspond to E_x = 17.1, 18.8, 19.9, 21.4, 22.4, 23.8 [± 0.2] MeV and 27 ± 0.5 MeV (broad). In the range E_γ = 18 to 26 MeV the integrated (γ, n₀) cross section is < 0.1 MeV · mb, that for (γ, n₁) = 2.4 ± 0.4 MeV · mb and the combined integrated cross section for (γ, n) to ⁸Be*(16.6) and (γ, α₀) to ⁵He_g.s. is 13.1 ± 2 MeV · mb.

The total absorption cross section has been measured for E_γ = 10 to 210 MeV: it rises to ≈ 5 mb at ≈ 21 MeV, decreases to about 0 at 160 MeV and then increases to ≈ 1.5 mb at 210 MeV. An integrated cross section of 156 ± 15 MeV · mb is reported for E_γ = 10 to 29 MeV as is resonant structure at E_γ = 11.8, (13.5), 14.8, 917.3), (19.5), 21.0, (23.0) and (25.0) MeV. Fine structure is also reported at E_γ = 20.47 ± 0.04 and 20.73 ± 0.04 MeV. See (1979AJ01) for references. See also (1978CH1E, 1979ZI1A, 1980AH1A, 1982DE1H), (1982BA1T; applications) and (1979BA60, 1979KI1D, 1980TA1D, 1981DE18, 1981DE33, 1981IS11; theor.).

14. (a) ⁹Be(γ, p)⁸Li Q_m = -16.887
(b) ⁹Be(γ, np)⁷Li Q_m = -18.920
(c) ⁹Be(γ, d)⁷Li Q_m = -16.6950
(d) ⁹Be(γ, t)⁶Li Q_m = -17.6878

The yield shows structure in the energy region corresponding to the ⁹Be levels at 17 - 19 MeV followed by the giant resonance at E_γ ≈ 23 MeV (σ = 2.64 ± 0.30 mb). Structure attributed to eleven states of ⁹Be with 18.2 < E_x < 32.2 MeV has also been reported. Integrated cross sections have been obtained for each of these resonances, and over different energy intervals for protons leading to ⁸Li*(0 + 0.98, 2.26 + 3.21, 9.0, 17.0). Angular and energy distributions of photoprotons in various energy intervals have been studied by many groups: see (1974AJ01) for references. See also (1976MA34). For momentum spectra using tagged photons with E_γ = 180 - 420 MeV and 360 - 600 MeV, see (1980HO22) and (1982BA32), respectively. See also (1981AR04, 1981TA1T, 1983ST1G).

The integrated cross sections are reported to be 1.0 ± 0.5 MeV · mb (E_γ = 21 → 33 MeV) for reaction (c) to ⁷Li*(0 + 0.4) and 0.6 ± 0.3 MeV · mb (E_γ = 25 → 33 MeV) for reaction (d) to ⁶Li(0). The total integrated cross section for [(γ, p) + (γ, pn) + (γ, d) + (γ, t)] is given as 33 ± 3 MeV · mb by (1966DE13), who also report resonances in the (γ, d) and (γ, t) cross sections corresponding to ⁹Be*(26.0 ± 0.2) and ⁹Be*(32.2 ± 0.3), respectively. See also (1974AJ01), (1980IS10, 1982AV06, 1983HO01, 1983LIZN) and (1981IS11, 1982SU09; theor.).

15. ⁹Be(γ, γ)⁹Be

See (1980IS10, 1982NOZW). See also (1979AJ01) and (1983ZH1D; theor.).

16. (a) ⁹Be(e, e)⁹Be
(b) ⁹Be(e, en)⁸Be Q_m = -1.6655
(c) ⁹Be(e, ep)⁸Li Q_m = -16.887
(d) ⁹Be(e, eα)⁵He Q_m = -2.46
(e) ⁹Be(e, eπ⁺)⁹Li Q_m = -153.174

< r² > ^1/2 = 2.519 ± 0.012 fm, Q = 6.5^+0.9_-0.6 fm²,
b = 1.5^+0.3_-0.2 fm [b = oscillator parameter],
< r² > ^1/2_M = 3.2 ± 0.3 fm, Ω = 6 ± 2 μ_N · fm² [this value of the
magnetic octupole moment implies a deformation of the average nuclear potential].

The elastic scattering of electrons has been studied for E_e up to 700 MeV. Magnetic elastic scattering gives indications of both M1 and M3 contributions. See also (1978DE32). Inelastic scattering populates a number of levels: Table 9.8 (in PDF or PS) displays the parameters of the states. See (1974AJ01, 1979AJ01) for other work and for references.

At E_e = 134.7 and 237 MeV (1979BU11) have determined transverse and longitudinal form factors for electrodisintegration in the region of the quasielastic scattering peak. They report the observation of E1 and E2 giant resonance peaks: see Table 9.8 (in PDF or PS). The quasielastic process has been studied in the range 250 - 580 MeV/c by (1978KU06). For reaction (c) see ⁸Li. For reaction (e) see (1980ST15). (1979JE04) have measured the ratio π^-/π⁺ in the electroproduction of 10 MeV pions. See also (1979SC1E) and the "General" section here.

17. ⁹Be(π^±, π^±)⁹Be (See also the "General" section here.)

The elastic scattering, and inelastic scattering to ⁹Be*(2.43, 6.76), have been studied at E_π^± = 162 MeV (1978GE11) and 291 MeV (1981GE03). Quadrupole contributions appear to be quite important for the elastic scattering at 162 MeV (1978GE11), but are much less so at higher energy (1981GE03). The inelastic scattering suggest the importance of radial localization effects (1981GE03). For a study of the (π⁺, π⁰) reaction see (1981BO06). For measurements of inclusive charged pion scattering yields see (1981MC09).

18. (a) ⁹Be(n, n)⁹Be
(b) ⁹Be(n, 2n)⁸Be Q_m = -1.6655

The population of ⁹Be*(0, 1.7, 2.4, 3.1, (6.8)) has been reported in this reaction: see (1974AJ01). For the neutron decay of these states see Table 9.5 (in PDF or PS). Angular distributions have been measured at E_n = 5.9 to 14.2 MeV [see (1974AJ01, 1979AJ01)] and at 3.5 to 7.1 MeV (1980CO1U; n₀, n₂), 6.97 to 14.93 MeV (1978HO23; n₀, n₂) and at 14.6 MeV (1982HAZK; n₀). See also (1981DAZZ, 1983ANZY), (1979BY01, 1980AK01; theor.) and ¹⁰Be.

19. ⁹Be(p, p)⁹Be

Elastic and inelastic scattering angular distributions have been studied at many energies in the range E_p = 5 to 1000 MeV [see (1974AJ01, 1979AJ01)] and at E_p = 2.31 to 2.73 MeV (1980BO1L; p₀), 35.2 MeV (1980FA07; p₀), 72 MeV (1982AU1B; p₀), 225 MeV (1981RO1F; p₀) and 1 GeV (1979AL26; p₀). The elastic distributions show pronounced diffraction maxima characteristic of the optical model. A quadrupole-deformed optical model potential is necessary to obtain a good fit to the p₀ and p₂ angular distributions: see (1974AJ01).

The structure corresponding to ⁹Be*(1.7) is asymmetric: the line shape peaks 25⁺¹⁵_-11 keV above the threshold for ⁸Be + n. The population of ⁹Be*(1.7) has been studied for E_p = 4.2 to 5.5 MeV: it is consistent with a scattering length of about -20 fm between a neutron and ⁸Be. The weighted mean of the values of E_x for ⁹Be*(2.4) listed in (1974AJ01) is 2432 ± 3 keV. ⁹Be*(3.1) has E_x = 3.03 ± 0.03 MeV, Γ = 250 ± 50 keV, J^π = 3/2⁺, 5/2⁺. Higher states are observed at E_x = 4.8 ± 0.2, 6.76 ± 0.06 [J^π = 1/2⁺, 5/2⁺, 7/2⁺ (but see below), Γ = 1.2 ± 0.2 MeV], 7.94 ± 0.08 (Γ ≈ 1 MeV), 11.3 ± 0.2 MeV (Γ ≈ 1 MeV), 14.4 ± 0.3 (Γ ≈ 1 MeV), 16.7 ± 0.3, 17.4 ± 0.3, 19.0 ± 0.4, 21.1 ± 0.5 and 22.4 ± 0.7 MeV [the five highest states are all broad]. For ⁹Be*(2.4, 6.8) B(E2 ↑) = 49 ± 6 and 24 ± 4 fm⁴ and Γ(E2 ↓) = 0.0025 and 0.10 eV, respectively. The strong population of ⁹Be*(2.4, 6.8) is consistent with the assumption that they have J^π = 5/2^- and 7/2^-, respectively, and are members of the ground-state K = 3/2^- band. See (1966LA04, 1974AJ01) for references.

The elastic scattering studied at E_p = 25 MeV (1974BI14) and 225 MeV (1981RO1F) shows that the depolarization parameter, D, deviates from unity and thus that a spin-spin term must be included in the optical parameter. The spin-flip probability at E_p-bar = 31 MeV is ≈ 0 for the p₂ group, which is expected in view of the collective nature of the transition (1981CO08). See also (1978AL1G) and (1979BY01, 1980KO1V, 1981BA50, 1981CO08, 1981GU1B, 1981GU1F, 1981KR17, 1982BA1X, 1982BA14, 1982GUZS; theor.).

20. (a) ⁹Be(p, 2p)⁸Li Q_m = -16.887
(b) ⁹Be(p, pd)⁷Li Q_m = -16.6950
(c) ⁹Be(p, pα)⁵He Q_m = -2.46
(d) ⁹Be(p, pn)⁸Be Q_m = -1.6655
(e) ⁹Be(p, d³He)⁵He Q_m = -20.82

The summed proton spectrum (reaction (a)) shows two peaks with Q = -16.4 ± 0.3 and -25.4 ± 0.5 MeV, corresponding to removal of a p-proton and an s-proton respectively, and a third peak of uncertain assignment (perhaps due to unresolved states) with Q = -32.3 ± 0.6 MeV. See (1974AJ01). See also (1979KO21; also for (p, pX)), (1979KRZX, 1981FR24). For reaction (b) see (1974AJ01). Reactions (c) and (f) are dominated by quasifree processes at E_p = 101.5 MeV: S_α(L = 0) = 0.45, S_α(L = 2) = 0.55 (1980NA09). See also (1982NA1N). Reaction (d) at E_p = 10 - 24 MeV involves the 5/2⁺ state [3.01 ± 0.02 MeV]. ⁹Be*(4.7) is also involved (1978JE01). See also (1982PE1F). For pion production see (1979BU1D). See also (1979BA28) and (1978WO1A, 1979BO27, 1979DO03, 1979KI10, 1979MA1M, 1980BO12, 1981IS11; theor.).

21. ⁹Be(d, d)⁹Be

Angular distributions have been reported in the range 1.0 to 410 MeV [see (1974AJ01, 1979AJ01)] and at E_d-bar = 2.0 to 2.8 MeV (1982DE1P; d₀) and E_d = 12.17 to 14.43 MeV (1978TA12; d₀, d₁, d₂).

Inelastic groups have been reported to ⁹Be*(1.7), to states with E_x = 2431.9 ± 7.0 keV and 3040 ± 15 keV (Γ = 294 ± 20 keV), and to ⁹B*(4.7, 6.8): see (1974AJ01). See also (1978ZE03, 1979DO03; theor.) and ¹¹B in (1985AJ01).

22. (a) ⁹Be(t, t)⁹Be
(b) ⁹Be(t, nt)⁸Be Q_m = -1.6655

Angular distributions of elastically scattered tritons have been measured at E_t = 2.10 MeV [see (1974AJ01)] and at E_{pol. t} = 15 and 17 MeV (1978SC02). Reaction (b) at E_t = 4.2 and 4.6 MeV proceeds via ⁹Be*(2.4): see (1974AJ01). See also (1981ME1D; theor.).

23. (a) ⁹Be(³He, ³He)⁹Be
(b) ⁹Be(³He, 2α)⁴He Q_m = 19.0041

Angular distributions have been studied for E(³He) = 1.6 to 32.6 MeV and at 217 MeV [see (1974AJ01, 1979AJ01)] and at E(³He) = 46.1 MeV (1979GO07; elastic). For optical model parameters see references in (1979AJ01). At E(³He) = 39.8 MeV, ⁹Be*(1.7, 2.4, 3.1, 4.7, 6.8, 14.4) are populated. In a study of reaction (b) the (⁵He + α) system is found to be mainly in an S-state: the probability of finding such a cluster in ⁹Be is N_eff = 0.05 (1975KA05). At E(³He) = 2.1 to 2.7 MeV quasifree processes are reported by (1978AR21): see ⁸Be. See also (1981DE1X) and (1979KA1G).

24. (a) ⁹Be(α, α)⁹Be
(b) ⁹Be(α, 2α)⁵He Q_m = -2.46
(c) ⁹Be(α, αn)⁸Be Q_m = -1.6655

Angualr distributions have been studied at many energies in the range E_α = 5.0 to 104 MeV [see (1974AJ01)] and at E_α = 35.5 MeV (1982PE03; α₀, α₁, α₂, α₄, α₅ and α to ⁹Be*(11.28)) and 65 MeV (1980HA33; α₀, α₂, α₅). See (1972DE01) for a discussion of optical model parameters. The structure (⁵He + α) for ⁹Be is found to be much more probable than (⁶Li + t ): the ratio of spectroscopic factors is about 30 (1972DE01).

At E_α = 35.5 MeV, states belonging to the K = 3/2^- ground-state band are strongly excited [⁹Be*(0, 2.43, 6.76, 11.28); it is suggested that the latter has J^π = (9/2^-); see, however, reaction 12]. The first three states belonging to the K = 1/2⁺ band are also excited [⁹Be*(1.68, 3.05, 4.70)] (1982PE03; coupled channels analysis). For reaction (b) see (1974AJ01) and (1980ZH1A; 18 MeV) and (1980WA07; 140 MeV). S_α = 0.96 (1976WO11). For reaction (c) see (1974AJ01). See also (1978ZE03, 1981BA20, 1982BU1D; theor.).

25. (a) ⁹Be(⁶Li, ⁶Li)⁹Be
(b) ⁹Be(⁷Li, ⁷Li)⁹Be

Elastic angular distributions have been measured at E(⁶Li) = 4, 6 and 24 MeV and at E(⁷Li) = 24 and 34 MeV: see (1979AJ01).

26. ⁹Be(⁹Be, ⁹Be)⁹Be

Elastic angular distributions have been obtained at E(⁹Be) = 5, 9, 12 and 16 MeV [see (1979AJ01)], at 14, 20 and 26 MeV (1979UN01) and at 40 to 55 MeV (1983OMZZ; also to ⁹Be*(2.43); σ (fusion)).

27. ⁹Be(¹⁰B, ¹⁰B)⁹Be

Elastic angular distributions are reported at E(¹⁰B) = 20.1 and 30 MeV (1980BO14).

28. (a) ⁹Be(¹²C, ¹²C)⁹Be
(b) ⁹Be(¹³C, ¹³C)⁹Be

Elastic angular distributions have been measured for reaction (a) at E(¹²C) = 12, 15, 18 and 21 MeV and E(⁹Be) = 14, 20, 26 and 43 MeV [see (1979AJ01)] and at E(⁹Be) = 14, 20 and 26 MeV (1979UN01), 20 MeV (1979BO1K), 20 and 26.1 MeV (1979JA04), 50 MeV (1977ST20), 69.7 and 76.6 MeV (1979MA21) and 158.4 MeV (1983FUZY). For yield and fusion cross-section measurements see (1978MA44, 1979MA21, 1981JA09, 1982DEZL, 1982HU06). Elastic angular distributions for reaction (b) are reported at E(⁹Be) = 14, 20 and 26 MeV (1979UN01) and 19.5 and 25.0 MeV (1979JA04). See also (1978TA1B, 1982JA1E) and (1978GR22, 1980BR05, 1980OH1B, 1981GR17, 1981HU07, 1982LO13, 1983DE1U; theor.).

29. ⁹Be(¹⁴N, ¹⁴N)⁹Be

Elastic angular distributions have been measured at E(¹⁴N) = 25 and 27.3 MeV: see (1974AJ01). For fusion studies see (1981MAZL, 1982MAZA).

30. (a) ⁹Be(¹⁶O, ¹⁶O)⁹Be
(b) ⁹Be(¹⁸O, ¹⁸O)⁹Be

Elastic angular distributions have been reported in the range E(¹⁶O) = 15 to 30 MeV [see (1979AJ01)] and at E(⁹Be) = 14, 20 and 26 MeV (1979UN01) and 158.4 MeV (1983FUZY), as well as at E(¹⁸O) = 12.1, 16 and 20 MeV [see (1974AJ01)]. See also (1981ST1P, 1982BE54), (1979HU1B, 1979MA30, 1979PAZY, 1981GR17, 1981GU1B; theor.).

31. (a) ⁹Be(²⁴Mg, ²⁴Mg)⁹Be
(b) ⁹Be(²⁶Mg, ²⁶Mg)⁹Be
(c) ⁹Be(²⁷Al, ²⁷Al)⁹Be
(d) ⁹Be(²⁸Si, ²⁸Si)⁹Be
(e) ⁹Be(³⁹K, ³⁹K)⁹Be
(f) ⁹Be(⁴⁰Ca, ⁴⁰Ca)⁹Be
(g) ⁹Be(⁴⁴Ca, ⁴⁴Ca)⁹Be

Elastic angular distributions have been measured at E(⁹Be) = 14, 20 and 26 MeV for reactions (a), (c), (d) and at 14 and 17 MeV for reaction (d): see (1979AJ01). Recent measurements are at E(⁹Be) = 12 to 30 MeV (1980BO11, 1981HU08; reaction (d)), 14, 20 and 26 MeV (1978UN02, 1979UN01; reactions (a) (nat. Mg), (c), (d), (f)), 20 MeV (1978JA07; reaction (d)), 27 and 40 MeV (1981GL03; reaction (d)), 40 MeV (1981HN04; reactions (e), (f), (g)), 45 and 60 MeV (1980EC01; reactions (d), (f)), 50 MeV (1977ST20; reactions (d), (f)), 158.4 MeV (1983FUZY; reactions (b), (c)) and 121 and 201.6 MeV (1980ZI02; reaction (d)). For fusion studies see (1980EC03, 1983EC01). See also (1980EC04) and (1979SA1E, 1980HU09; theor.).

32. ¹⁰Be(d, t)⁹Be Q_m = -0.5548

Forward angular distributions have been obtained at E_d = 15.0 MeV for the tritons to ⁹Be*(0, 1.7, 2.4, 3.1). The ground-state transition is well fitted by l = 1. The transition to ⁹Be*(1.7) [≈ 165 ± 25 keV] is consistent with J^π = 1/2⁺, that to ⁹Be*(2.4) is quite well fitted with l = 3 [J^π = 5/2^-], and that to ⁹Be*(3.1) [Γ = 280 ± 25 keV] is consistent with l = 2. No other narrow states are seen up to E_x = 5.5 MeV (1970AU02).

33. ¹⁰B(n, d)⁹Be Q_m = -4.3620

Angular distributions of the d₀ and d₁ groups have been measured at E_n = 14.4 MeV: see (1974AJ01). See also ¹¹B in (1980AJ01).

34. ¹⁰B(p, 2p)⁹Be Q_m = -6.5865

The summed proton spectrum at E_p = 460 MeV yields Q = -6.7 ± 0.5, -11.9 ± 0.5, -17.1 ± 0.6 (all l ≠ 0) and Q = -30.5 ± 0.6 MeV (l = 0): see (1974AJ01).

35. ¹⁰B(d, ³He)⁹Be Q_m = -1.0930

Angular distributions of the ³He groups corresponding to ⁹Be*(0, 2.4) have been studied at E_d = 11.8, 28 and 52 MeV [the latter also to ⁹Be*(6.7)], and at E_d = 15 MeV: S = 0.72 and 0.82 for ⁹Be*(0, 2.4). At E_d-bar = 52 MeV ⁹Be*(11.3) appears to be strongly populated: see (1979AJ01).

36. ¹⁰B(t, α)⁹Be Q_m = 13.2275

At E_t = 12.9 MeV α-groups are observed to the ground state of ⁹Be and to excited states at E_x = 1.75 ± 0.03, 2.43, 3.02 ± 0.04 (Γ = 320 ± 60 keV), 11.27 ± 0.04 (Γ = 530 ± 70 keV), (14.4) [Γ ≈ 800 keV], 14.39 and 16.67 MeV. The T = 3/2 state ⁹Be*(14.39) is very weakly populated [≈ 5% of intensity of α₂]. The angular distribution of the α₂ group shows sharp forward and backward peaking. The α₀ group is not peaked in the backward direction: see (1979AJ01). Angular distributions are also reported at E_t = 0.9 and 1.1 MeV to ⁹Be*(2.4) (1980CI1B). A study at E_t = 1.0 to 3.2 MeV finds E_x = 1.750 ± 0.025 MeV, Γ = 220 ± 8 keV: see (1974AJ01). See also (1978KR16; theor.) and ¹³C in (1981AJ01).

37. ¹⁰B(α, ⁵Li)⁹Be Q_m = -8.551

See ⁵Li.

38. ¹¹B(n, t)⁹Be Q_m = -9.5589

The angular distribution of t₀ has been measured at E_n = 14.4 MeV: see (1974AJ01).

39. ¹¹B(p, ³He)⁹Be Q_m = -10.3227

At E_p = 45 MeV angular distributions are reported for the ³He ions corresponding to ⁹Be*(0, 2.4, 11.8, 13.8, 14.39 [T = 3/2], 15.96 ± 0.04 [T = 1/2]). In addition one or more states may be located at ⁹Be*(15.13). It is suggested that ⁹Be*(11.8, 13.8, 15.96) are the J = 3/2^-, T = 1/2 analogs to ⁹B*(12.06, 14.01, 16.02). Angular distributions are also reported at E_p = 40 MeV. The intensity of the group to ⁹Be*(3.1) is ≈ 1% of the ground-state group at that energy: see (1974AJ01). The excitation energy of the first T = 3/2 state is E_x = 14392.9 ± 1.8 keV (1974KA15), using Q_m. See also (1981CO2D) and ¹²C in (1985AJ01).

40. (a) ¹¹B(d, α)⁹Be Q_m = 8.031
(b) ¹¹B(d, nα)⁴He⁴He Q_m = 6.457

Alpha groups reported corresponding to ⁹Be*(0, 1.7, 2.4, 3.1). The width of ⁹Be*(1.7) [E_x = 1.70 ± 0.01 MeV] is Γ_c.m. = 220 ± 20 keV. The weighted mean of the values of E_x of ⁹Be*(2.4), reported in (1974AJ01), is 2425 ± 3 keV. The 5/2⁺ state is at E_x = 3.035 ± 0.025 MeV: Γ_c.m. = 257 ± 25 keV. The ratio Γ_γ/Γ of ⁹Be*(1.7) ≤ 2.4 × 10^-5, that for ⁹Be*(2.4) is reported to be (1.16 ± 0.14) × 10^-4. Since Γ_γ is known from (e, e') [see Table 9.8 (in PDF or PS): 0.089 ± 0.010 eV], Γ = 0.77 ± 0.15 keV. See (1974AJ01, 1979AJ01) for references.

Angular distributions for α₀ and α₂ are reported at E_d = 0.39 to 3.9 MeV and at 12 MeV [see (1974AJ01, 1979AJ01)]. Reaction (b), at E_d = 10.4 and 12.0 MeV, proceeds via ⁹Be*(2.4) and to some extent via ⁹Be*(3.1, 4.7) and possibly some higher excited states. The dominant decay of ⁹Be*(2.4) is to ⁵He(0) + α while ⁹Be*(3.1, 4.7) decay to ⁸Be(0) + n. It should be noted, however, that the peaks corresponding to ⁹Be*(3.1) have a FWHM of ≈ 1 MeV, which may imply that ⁹Be*(2.8) is involved.

41. (a) ¹²C(n, α)⁹Be Q_m = -5.7010
(b) ¹²C(n, nα)⁴He⁴He Q_m = -7.2747

Angular distributions of the α₀ group have been measured at E_n = 13.9 to 18.8 MeV [see (1974AJ01)] and at 14 MeV (1981HAZW). ⁹Be*(1.7, 2.4, 3.1) are also populated. At E_n = 14.7 MeV (1981GU12) report the involvement of ⁹Be*(6.76) which subsequently decays by n-emission. Reaction (b) at E_n = 13 to 18 MeV populates ⁹Be*(2.4). See also (1979SUZW), ¹²C in (1980AJ01) and reactions 30 and 34 in ¹³C in (1981AJ01).

42. ¹³C(³He, ⁷Be)⁹Be Q_m = -9.060

Angular distributions have been obtained at E(³He) = 70 MeV for the transitions to ⁹Be*(0, 2.4) and ⁷Be*(0, 0.43). Broad states at 2.9, 4.8 ± 0.2, 7.3 ± 0.2 and 11.9 ± 0.4 MeV are also populated (1976ST11).

43. ¹³C(α, ⁸Be)⁹Be Q_m = -10.7392

At E_α = 65 MeV angular distributions have been measured for the transitions to ⁹Be*(0, 2.4) (1976WO11). See also (1979BE1J).

44. ¹⁹F(d, ¹²C)⁹Be Q_m = 0.3009

See (1981GO16) in ¹²C (1985AJ01).

45. ²³Na(d, ¹⁶O)⁹Be Q_m = -3.0059

See (1981RU09; E_d = 13.6 MeV).