
^{9}Li (1966LA04)(See Energy Level Diagrams for ^{9}Li) See also Table 9.1 [Table of Energy Levels] (in PDF or PS). Mass of ^{9}Li: From the Qvalue for ^{7}Li(t, p)^{9}Li: Q = 2.397 ± 0.020 MeV, the mass excess of ^{9}Li is 24.965 ± 0.020 MeV (1964MI04, 1965MA54).
^{9}Li decays to the ground state (25 ± 15 %) and to the 2.43 MeV, neutronunstable state of ^{9}Be (75 ± 15 %). The βendpoints are 13.5 ± 0.3 MeV and 11.0 ± 0.4 MeV; log ft = 5.5 ± 0.2 and 4.7 ± 0.2, respectively. Delayed neutrons of energy 0.7 ± 0.2 MeV are associated with the 11 MeV branch; there are indications of a weak neutron group with E_{n} ≈ 3  4.5 MeV (1963AL18). (1963NE07) finds E_{β}(max) = 13.1 ± 0.5 MeV, log ft = 5.0 ± 0.3. The mean of reported half lives is 172 ± 3 msec (1951GA30, 1952HO25, 1952SH44, 1961HI01, 1963AL18, 1965BE1P). The fact that the decay to ^{9}Be(3/2^{}) is allowed indicates J^{π}(^{9}Li) = 1/2^{}, 3/2^{} or 5/2^{}; if ^{9}Be*(2.43) has J^{π} = 5/2^{}, the allowed decay excludes 1/2^{} (1963AL18). See also (1964ER1C).
At E_{t} = 11.28 MeV, two groups are observed: the ground state group yields Q_{0} = 2.397 ± 0.020 MeV. The first excited state has E_{x} = 2.691 ± 0.005 MeV; no other states are seen with E_{x} < 4.0 MeV. The angular distribution of groundstate protons appears to require L = 0 and L = 2 transfer, consistent with the expected J^{π} = 3/2^{} (1964MI04). See also (1961HI01, 1964RO1G).
See (1951GA30).
Not observed.
See (1952SH44, 1958TA04, 1963NE07) for reaction (a), and (1965BE1P) for (b).
Not observed.
