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GENERAL: See also (1980AJ01) and Table 11.3 [Table of Energy Levels] (in PDF or PS).

Model calculations:(1981RA06, 1981SE06, 1983MI1E, 1984VA06).

Electromagnetic transitions:(1980MI1G).

Complex reactions involving ¹¹Be:(1979BO22, 1980WI1L, 1983EN04, 1983WI1A, 1984GR08, 1984HI1A).

Hypernuclei:(1979BU1C, 1982IK1A, 1982KA1D, 1982KO11, 1983FE07, 1983KO1D, 1983MI1E).

Other topics:(1981SE06, 1982NG01).

Ground-state properties of ¹¹Be:(1981AV02, 1982NG01, 1983ANZQ).

1. 11Be(β-)11B

Qm = 11.508

The decay is complex: see reaction 28 in ¹¹B and Table 11.13 (in PDF or PS). The half-life is 13.81 ± 0.08 sec (1970AL21). See also (1980AJ01).

2. 9Be(t, p)11Be

Qm = -1.167

Proton groups have been observed to the states displayed in Table 11.3 (in PDF or PS). τ_m for the first excited state is 166 ± 15 fsec (1983MI08), corresponding to a very large E1 transition strength of 0.36 ± 0.03 W.u.; E_γ = 320.04 ± 0.10 keV (see (1983MI08)). 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 28 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. + two neutrons. See (1980AJ01) for references.

3. 10Be(n, γ)11Be

Qm = 0.503

See (1975AJ02).

4. 10Be(d, p)11Be

Qm = -1.722

Angular distributions of the p₀ and p₁ groups have been measured at E_d = 6 MeV and 12 MeV: l_n = 0 [and therefore J^π = 1/2⁺ for ¹¹Be(0)] and 1, S = 0.73 ± 0.06 and 0.63 ± 0.15, respectively. At E_d = 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 (1980AJ01) for references.

5. 11Li(β-)11Be †

Qm = 20.76

See ¹¹Li.

6. 12C(7Li, 8B)11Be

Qm = -28.189

At E(⁷Li) = 82 - 83 MeV groups corresponding to ¹¹Be*(0, 1.8, 3.4) are reported by (1982AL08, 1983AL20).

7. 13C(6Li, 8B)11Be

Qm = -25.885

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 (1980AJ01).