Information on mass chains and nuclides

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GENERAL:

Mass of ¹¹Be: From the decay energy, ¹¹Be(β^-)¹¹B, and using the Wapstra mass (1955WA1A) for ¹¹B, the mass excess of ¹¹Be, M - A = 23.39 ± 0.15 MeV (1959WI49). The binding energies of a neutron, deuteron and triton in ¹¹Be are, respectively, 0.54, 18.4 and 15.76 MeV.

1. 11Be(β-)11B

Qm = 11.48

The decay proceeds to ¹¹B_g.s. and to several excited states. For the ground-state transition, E_β(max) = 11.48 ± 0.15 MeV; τ_1/2 = 13.57 ± 0.15 sec, log ft = 6.77 (1958AL96, 1959WI49); see ¹¹B.

2. 9Be(t, p)11Be

Qm = -1.13

Not reported.

3. 11B(n, p)11Be

Qm = -10.69

At E_n = 14.8 MeV, an activity with a 14.1 ± 0.3 sec half-life is observed which is attributed to the β-decay of ¹¹Be formed in this reaction (1958NU40).