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11Li (1980AJ01)
(See the Isobar Diagram for 11Li)
11Li has been observed in the bombardment of iridium by 24 GeV protons. Its mass excess is 40.94 ± 0.08 MeV
(1975TH08). The cross section for its formation is ≈ 50 μb (1976THZS). 11Li is bound: Eb
for break up into 9Li + 2n and 10Li + n are 158 ± 80 and 960 ± 250 keV, respectively [see (1979AJ01) for discussions of the masses of
9Li and 10Li]. The half-life
of 11Li is 8.5 ± 0.2 msec (1974RO31): it decays to neutron unstable states of
11Be [Pn = (60.8 ± 7.2)%: (1974RO31)]. Since systematics suggest Jπ = 1/2- for 11Lig.s., the remainder
of the decay is presumably to 11Be*(0.32) (Jπ =
1/2-). Log ft = 5.0 (1975TH08). (1977BA11; theor.) suggest that the ground state of
11Li has large admixtures of higher configurations and that the mass of
11Li should be used with caution in mass equations. These calculations predict a large
fraction of high energy neutrons suggesting that the actual Pn is greater than 61%
(1977BA11). See also (1973TO16, 1974HA1H, 1975AJ02) and (1973TA30, 1975BE31, 1975JE02, 1976IR1B; theor.).