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10Be (1984AJ01)


(See Energy Level Diagrams for 10Be)

GENERAL: See also (1979AJ01) and Table 10.1 [Table of Energy Levels] (in PDF or PS).

Model calculations: (1980FU1G, 1981DE2G).

Special states: (1981DE2G, 1981SE06).

Electromagnetic transiitons: (1982LA26, 1982RI04).

Astrophysical questions: (1978BU1B, 1979MO04, 1979SI1D, 1980WI1M, 1981GA1B, 1981GA1C, 1981KR1C, 1981PR1B, 1981SA1G, 1982BR1N, 1982KU1J, 1982PA1F).

Applied work: (1978MU1B, 1978RA1C, 1979GO1L, 1979IN1C, 1979LI1C, 1979RA1E, 1980EL1B, 1980EL1C, 1980GO1B, 1980KI1B, 1980LA1B, 1981FA1E, 1981LI1K, 1981RA1F, 1981SA1G, 1981SC1D, 1981TH1C, 1982BO35, 1982BR1N, 1982KL1A, 1982KU1G, 1982KU1J, 1982PA1F, 1983KR1B, 1983SO1B, 1983SU1C).

Complex reactions involving 10Be: (1978DU1B, 1978HE1C, 1978TU06, 1979AL22, 1979BO22, 1979JA1C, 1979SC1D, 1979VI05, 1980GR10, 1980WI1L, 1981CI03, 1981MO20, 1982BI1C, 1982BO1J, 1982GU1H, 1982LU01, 1982LY1A, 1983SA06).

Muon and neutrino capture and reactions: (1979GO1M, 1980MU1B, 1981GI08).

Reactions involving pions and kaons (See also reactions 10, 16 and 18): (1978DA1A, 1978WA1B, 1979PE1C, 1980BO1B, 1981AU1C, 1981FE2A, 1981SI09, 1981WH01, 1981YA1A, 1982AU02, 1982RO04, 1982WA1G).

Hypernuclei: (1978DA1A, 1978PO1A, 1978SO1A, 1980RO1F, 1980ZH1C, 1981WA1J, 1982IK1A, 1982KO1L, 1982KO11, 1982RA1L).

Other topics: (1981SE06, 1982DE1N, 1982NG01).

Ground-state properties of 10Be: (1978SM02, 1981AV02, 1982NG01).

1. 10Be(β-)10B Qm = 0.5568

The half-life of 10Be is (1.6 ± 0.2) × 106 y; log ft = 13.42: see (1974AJ01). See also (1979FE1E; theor.) and (1979AJ01).

2. (a) 7Li(t, γ)10Be Qm = 17.2498
(b) 7Li(t, n)9Be Qm = 10.4377 Eb = 17.2498
(c) 7Li(t, p)9Li Qm = -2.386
(d) 7Li(t, d)8Li Qm = -4.225
(e) 7Li(t, t)7Li
(f) 7Li(t, α)6He Qm = 9.839

The yield of γ0 and γ1 has been studied for Et = 0.4 to 1.1 MeV (1978SU02) [10Be*(17.79) is said to be involved]. See also (1974AJ01). The neutron yield exhibits a weak structure at Et = 0.24 MeV and broad resonances at Et ≈ 0.77 MeV [Γ = 160 ± 50 keV] and 1.74 MeV: see (1966LA04) [10Be*(17.79, 18.47)]. The total cross section for reaction (c), the yield of neutrons (reaction (b) to 9Be*(14.39)), and the yield of γ-rays from 7Li*(0.48) (reaction (e)) all show a sharp anomaly at Et = 5.685 MeV: Jπ = 2-; T = 2 is suggested for a state at Ex = 21.22 MeV. The total cross section for α0 (reaction (e)) and the all-neutrons yield do not show this structure (1979AB11, 1980AB16, 1982AB1D, 1983AB1A). Differential cross sections and S-factors are reported by (1983CE01) for Et = 70 to 110 keV for 6He*(0, 1.80). The zero-energy S-factor for 6He*(1.80) is 14 ± 2.5 MeV · b. The relevance to an Li-seeded tritium plasma is discussed by (1983CE01). See also (1974AJ01, 1979AJ01).

3. 7Li(α, p)10Be Qm = -2.5642

Angular distributions have been measured at Eα = 30 and 50 MeV: see (1979AJ01).

4. 7Li(7Li, α)10Be Qm = 14.782

Angular distributions have been reported for E(7Li) = 2.1 to 5.75 MeV and at 30.3 MeV: see (1974AJ01).

5. 9Be(n, γ)10Be Qm = 6.8121
Q0 = 6812.1 ± 0.2 keV: see (1980IS02)
Q0 = 6912.08 ± 0.10 keV: see (1981KE02).

The thermal capture cross section is 7.6 ± 0.8 mb (1981MUZQ). Reported γ-ray transitions are displayed in Table 10.2 (in PDF or PS).

6. 9Be(n, n)9Be Eb = 6.8121

The scattering amplitude (bound) a = 7.778 ± 0.003 fm, σfree = 6.151 ± 0.005 b (1981MUZQ). Earlier cross-section measurements are listed in (1979AJ01, 1981MUZQ). Recent σt measurements have been reported for En = 0.002 to 0.005 eV (1979AD1B), 23.5 keV (1975BL07; 5.903 ± 0.011 b), 1.0 to 13.5 MeV (1979AU07), 6.97 to 14.94 MeV (1978HO23; total elastic) and 200 to 590 MeV (1980FR1K). See also (1980AD1A).

Observed resonances are displayed in Table 10.3 (in PDF or PS). Analysis of polarization and differential cross-section data leads to the 3-, 2+ assignments for 10Be*(7.37, 7.55). Below En = 0.5 MeV the scattering cross section reflects the effect of bound 1- and 2- states, presumably 10Be*(5.960, 6.26). There is also indication of interference with s-wave background and with a broad l = 1, Jπ = 3+ state. The structure at En = 2.73 MeV is ascribed to two levels: a broad state at about 2.85 MeV with Jπ = 2+, and a narrow one, Γ ≈ 100 keV, at En = 2.73 MeV with a probable assignment of Jπ = 4-. The 4- assignment results from a study of the polarization of the n0 group at En = 2.60 to 2.77 MeV. A rapid variation of the polarization over this interval is observed, and the data are consistent with 4-(l = 2) for 10Be*(9.27). A weak dip at En ≈ 4.3 MeV is ascribed to a level with J ≥ 1. See (1974AJ01) for references. The analyzing power has been measured for En = 1.6 to 4.8 MeV (1975HO01) and Epol. n = 9 to 15 MeV (1981FL1A, 1981FL04; n0, n2). See also (1981WA1G, 1983ANZY) and (1979BY01, 1983BY01; theor.).

7. (a) 9Be(n, n')9Be* Eb = 6.8121
(b) 9Be(n, 2n)8Be Qm = -1.6655

The non-elastic and the (n, 2n) cross sections rise rapidly to ≈ 0.6 b (≈ 0.5 b for (n, 2n)) at En ≈ 3.5 MeV and then stay approximately constant to En = 15 MeV: see (1979AJ01). Recent measurmeents include those of (1978HO23; En = 6.97 to 14.94 MeV; inelastic cross sections to unresolved states at Ex = 1.7 - 3.1 MeV). Ay measurements are reported for the n2 group [to 9Be*(2.4)] at En = 9 to 15 MeV (1981FL1A). For reaction (b) see also (1980BA2L; applied work) and (1978HE1F; theor.).

8. (a) 9Be(n, p)9Li Qm = -12.824 Eb = 6.8121
(b) 9Be(n, d)8Li Qm = -14.662
(c) 9Be(n, t)7Li Qm = -10.438

Cross sections have been meaasured at En = 14.1 - 14.9 MeV for reaction (a), 16.3 to 18.7 MeV for (b) and 13.3 to 15.0 (t1) and 22.5 MeV (reaction (c)): see (1979AJ01). See also (1981HAZJ, 1982HA1A).

9. 9Be(n, α)6He Qm = -0.598

The cross section for production of 6He shows a smooth rise to a broad maximum of 104 ± 7 mb at 3.0 MeV, followed by a gradual decrease to 70 mb at 4.4 MeV. From En = 3.9 to 8.6 MeV, the cross section decreases smoothly from 100 mb to 32 mb. Excitation functions have been measured for α0 and α1 for En = 12.2 to 18.0 MeV: see (1979AJ01) for references. See also (1981HAZJ, 1982HA1A).

10. 9Be(p, π+)10Be Qm = -133.538

Angular distributions have been studied at Ep = 185 MeV (1973DA09: to 10Be*(0, 3.37, 6.07 ± 0.13, 7.39 ± 0.13, 9.31 ± 0.24, 11.76)), 200 MeV (1978AU07: to 10Be*(0, 3.37)), 410 and 605 MeV (1980DI02: to 10Be*(0, 3.37, 6.1)) and 800 MeV (1979HO13: to 10Be*(0, 3.37, 11.8)); the latter may be unresolved). (1982AU02) have studied Ay(θ) for the π+ to 10Be*(0, 3.37) for Epol. p = 200 and 250 MeV: little variation with E is observed. The cross section for π+ production near threshold has been studied by (1979MA38). See also the "General" section here, and (1981NI1B, 1982HO1C, 1982NA1K).

11. 9Be(d, p)10Be Qm = 4.5875

Angular distributions of proton groups have been studied at many energies in the range Ed = 0.15 to 17.l3 MeV [see (1979AJ01)], at Ed = 2.0 to 2.8 MeV (1983DE1P; p0, p1) and at 698 MeV (1981BO03; p to 10Be*(0, 3.37, 6.1, 7.37 + 7.54, 9.27 + 9.4, 11.8). At Ed = 15 MeV (1976DA15) find S = 2.1, 0.23 (jn = 3/2) and 0.12 (jn = 1/2), ≤ 1.0, 0.065 (jn = 5/2) and 0.132 (jn = 1/2), for 10Be*(0, 3.37, 5.96, 6.62) (1976DA15). The angular distributions show ln = 1 transfer for 10Be*(0, 3.37, 5.958, 7.54), ln = 0 transfer for 10Be*(5.960, 6.26), ln = 2 transfer for 10Be*(7.37). 10Be*(6.18, 9.27, 9.4) are also populated, as are two states at Ex = 10.57 ± 0.03 and 11.76 ± 0.02 MeV (1974AN27). 10Be*(9.27, 9.4, 11.76) have Γc.m. = 150 ± 20, 291 ± 20 and 121 ± 10 keV (1974AN27).

Attempts to understand the γ-decay of 10Be*(5.96) and its population in 9Be(n, γ)10Be led to the discovery that it consisted of two states separated by 1.6 ± 0.5 keV. The lower of the two has Jπ = 2+ and decays primarily by a cascade transition via 10Be*(3.37) [it is the state fed directly in the 9Be(n, γ) decay]; the higher state has Jπ = 1- and goes mainly by a crossover to 10Beg.s.. Angular correlations measured with ther γ-ray detector located normal to the reaction plane (≡ angular distributions) lead to ln values consistent with the assignments of 2+ and 1- for 10Be*(5.9658, 5.9660) obtained from the character of the γ-decay (1969RO12). 10Be*(6.18) decays primarily to 10Be*(3.37): Eγ = 219.4 ± 0.3 keV for the 6.18 → 5.96 transition (1969AL17). See Table 10.4 (in PDF or PS) for a listing of the information on radiative transitions obtained in this reaction and lifetime measurements. For (p, γ) correlations through 10Be*(3.37) see (1974AJ01). For polarization measurements see 11B in (1980AJ01). See also (1981CE04), (1974FI1D) and (1982GO05; theor.).

12. 9Be(3He, 2p)10Be Qm = -0.9061

See (1980CO12; E(3He) = 13 MeV) and 12C in (1985AJ01).

13. 9Be(α, 3He)10Be Qm = -13.7657

Angular distributions have been studied at Eα = 65 MeV to 10Be*(0, 3.37, 5.96, 6.26, 7.37, 7.54, 9.33, 11.88). DWBA analyses of these lead to spectroscopic factors which are in poor agreement with those reported in other reactions (1980HA33).

14. 9Be(7Li, 6Li)9Be Qm = -0.438

Angular distributions have been measured at E(7Li) = 34 MeV to 10Be*(0, 3.4): S = 2.07 and 0.42(p1/2), 0.38(p3/2) (1977KE09).

15. (a) 10Be(p, p)10Be
(b) 10Be(d, d)10Be

Angular distrinbutions of the p0 and p1 groups have been measured at Ep = 12.0 to 16.0 MeV. The elastically scattered deuterons have been studied at Ed = 12.0 and 15.0 MeV: see (1974AJ01).

16. (a) 10Be(γ, π+)10Be Qm = -140.124
(b) 10B(e, e'π+)10Be Qm = -140.124

Differential cross sections have been measured for reaction (a) to 10Be*(0, 3.37) for Eγ ≈ 230 to 340 MeV (1980BO24). Measurements are also reported at Eπ+ = 17, 29 and 48 MeV to 10Beg.s. and at the two higher energies for the transitions to 10Be*(3.37) (1982RO04). See also (1981YA1A; Eγ ≈ 183 MeV; g.s.). At Ee = 158.5 to 165.0 MeV the angular distributions of 12.3 ± 0.7 MeV pions are reported by (1982ZU03). The (e, π+) angular distributions to 10Be*(0, 3.37) are in good agreement with the M3 form factors. It is suggested that 10Be*(5.96) is also populated through an M1 transition. (1982ZU03) also present a review of the data for the 90° photopion cross section leading to 10Beg.s. as a function of Eπ+. See also (1982DE14; theor.).

17. 10B(μ-, ν)10Be Qm = 105.1026

Partial capture rates leading to the 2+ states 10Be*(3.37, 5.96) are reported by (1981GI08).

18. 10B(π-, γ)10Be Qm = 139.011

The total radiative capture branching ratio for stopped pions is (2.27 ± 0.22)%. The γ-spectrum is dominated by the transition to 10Be*(6.0) [Jπ = 2+] (1975BA52). See also (1979AL1M) and (1979TR1B).

19. 10B(p, pπ+)10Be Qm = -140.124

See (1979AJ01).

20. 10B(d, 2p)10Be Qm = -3.5637

Angular distributions are reported at Ed = 55 MeV to 10Be*(0, 3.37, 5.96, 9.4) (1979ST15).

21. 11Li(β-)11Be → 10Be + n

11Li populates several states of 10Be, via delayed neutron emission. Gamma rays have been observed for the transitions 6.18 → 5.96, 6.18 → 3.37, 5.96 (unres.) → 3.37 and 3.37 → g.s. with Iγ = (0.95 ± 0.35), (1.65 ± 0.70), (3.5 ± 1.0) and (21 ± 6)%, respectively (1980DE39). See also 11Be in (1985AJ01).

22. 11B(γ, p)10Be Qm = 11.2287

Transitions to 10Be*(3.4) from the upper region of the giant resonance in 11B are reported to be about twice as intense as those from the lower region: see 11B in (1975AJ02). Angular distributions of the p0 and p1 groups have been measured with Ebs = 18.5 MeV and the yield of the 3.37 MeV γ-ray has been reported for Ebs = 100 to 800 MeV: see (1979AJ01). See also (1982GO03; theor.).

23. 11B(n, d)10Be Qm = -9.0042

The angular distribution of the d0 group has been measured at En = 14.4 MeV: see (1974AJ01).

24. 11B(p, 2p)10Be Qm = -11.2287

Structure is observed in the summed proton spectrum corresponding to Q = -10.9 ± 0.35, -14.7 ± 0.4, -21.1 ± 0.4, -35 ± 1 MeV: see (1974AJ01).

25. 11B(d, 3He)10Be Qm = -5.7352

Angular distributions have been measured at Ed = 11.8 and 22 MeV to 10Beg.s. [see (1974AJ01)] and at 52 MeV to 10Be*(0, 3.37, 5.96, 9.60): S = 0.65, 2.03, 0.13, 1.19 (normalized to the theoretical value for the ground state); π = + for 10Be*(9.6) (1975SC41).

26. 11B(t, α)10Be Qm = 8.5853

See (1979AJ01).

27. 11B(14N, 15O)10Be Qm = -3.932

See (1974AJ01). See also (1978MA1F).

28. 12C(p, 3p)10Be Qm = -27.1849

See (1979KO36).

29. 12C(6Li, 8B)10Be Qm = -21.442

At E(6Li) = 80 MeV, 10Be*(0, 3.37, 5.96, 7.54, (9.4), 11.8) are populated and the angular distribution to 10Beg.s. has been measured: see (1979AJ01). See also (1982AL08).