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GENERAL: See also (85AJ01) and Table 11.2 [Table of Energy Levels] (in PDF or PS).

Model calculations:(84MI1H, 84VA06, 86WI04).

Electromagnetic transitions:(84MI1H, 84VA06, 87HO1L).

Complex reactions involving ¹¹Be:(85BO1A, 86AV1B, 87TR05, 87WA09, 88BA53, 88RU01, 88TA1N, 88TR03, 89SA10).

Muon and neutrino capture and reactions:(84KO24).

Hypernuclei:(85IK1A, 86ME1F).

Other topics:(84MI1H, 85AN28, 86AN07).

Ground-state properties of ¹¹Be:(84FR13, 87SA15, 87VA26, 89BE03).

The interaction matter radius of ¹¹Be is 2.86 ± 0.04 fm (88TA10). See also (89SA10, 89TA1K).

1. 11Be(β-)11B

Qm = 11.506

The decay is complex: see reaction 26 in ¹¹B and Table 11.12 (in PDF or PS). The half-life is 13.81 ± 0.08 s (70AL21). See also (80AJ01).

2. 9Be(t, p)11Be

Qm = -1.165

Proton groups have been observed to the states displayed in Table 11.2 (in PDF or PS). τ_m for the first excited state is 166 ± 15 fs, corresponding to a very large E1 transition strength of 0.36 ± 0.03 W.u.; E_γ = 320.04 ± 0.10 keV. The J^π of ¹¹Be*(0.32) is 1/2^-, as determined by a study of the yield of 320 keV γ-rays as a function of time in μ^- capture by ¹¹B. The strength of the E1 transition fixes J^π of ¹¹Be(g.s.) to be 1/2⁺ or 3/2⁺, using the parity information obtained from the nature of the β^- decay of the ground state [see reaction 26 in ¹¹B]. ¹¹Be*(5.24, 6.71, 8.82) are strongly populated at E_t = 20 MeV indicating that these states have a large overlap with ⁹Be_g.s. + 2n. See (80AJ01, 85AJ01) for references.

3. 10Be(d, p)11Be

Qm = -1.720

Angular distributions of the p₀ and p₁ groups have been measured at E_m = 6 MeV and 12 MeV: l_n = 0 [and therefore J^π = 1/2⁺ for ¹¹Be(0)] and l, S = 0.73 ± 0.06 and 0.63 ± 0.15, respectively. At E_m = 25 MeV ¹¹Be*(0, 0.32, 1.78) are strongly populated: S = 0.77, 0.96, and 0.50, respectively, J^π = (5/2, 3/2)⁺ for ¹¹Be*(1.78) [l_n = 2]. See (80AJ01) for references.

4. 11Li(β-)11Be

Qm = 20.68

See ¹¹Li.

5. 11B(π-, γ)11Be

Qm = 128.063

The photon spectrum from stopped pions includes a peak corresponding to ¹¹Be*(0 + 0.32) (86PE05).

6. 12C(π-, p)11Be

Qm = 112.105

See (87BL07; E_π^- = 145 MeV).

7. 12C(7Li, 8B)11Be

Qm = -28.187

At E(⁷Li) = 82 MeV ¹¹Be*(0 + 0.32, 1.8, 3.4) are populated (85AL1G).

8. 13C(6Li, 8B)11Be

Qm = -25.884

At E(⁶Li) = 80 MeV, ¹¹Be*(0.32) is strongly populated and the angular distribution to this state has been measured. ¹¹Be*(2.69, 4.0) are also observed: see (80AJ01).