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13Be (1991AJ01)

(Not illustrated)

13Be is reported to have been populated in the 14C(7Li, 8B) reaction at E(7Li) = 82 MeV. Its atomic mass excess is reported to be 35.0 ± 0.5 MeV and Γ = 0.9 ± 0.5 MeV (1983AL20, 1985AL1G). It is then unstable with respect to breakup into 12Be + n by 1.9 ± 0.5 MeV. However, the reported state may not be the ground state of 13Be (1989OG1B). See also (1989DE52). 13Be has not been observed in the interaction of 44 MeV/A 40Ar ions on Ta, as would be expected since it is unstable (1986GI10). A calculation in a (0 + 1)ℏω model suggests that the first four states of 13Be calculated to be at 0, 0.05, 1.28 and 1.55 MeV have Jπ = 1/2-, 5/2+, 5/2- and 1/2+ (1985PO10). See also (1985GA1C, 1986DO01, 1986GA33; hypernuclei), (1987PE1C), (1986AN07) and (1987SA15, 1989PO1K; theor.).