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## 9Li (1974AJ01)

(See Energy Level Diagrams for 9Li)

GENERAL: See also Table 9.1 [Table of Energy Levels] (in PDF or PS).

Model calculations: (1966BA26).

Special reactions: (1965DO13, 1966GA15, 1966KL1C, 1967AU1B, 1967CA1J, 1967HA10, 1968DO20, 1972VO06, 1973KO1D, 1973MU12, 1973WI15).

Other topics: (1972CA37, 1972PN1A, 1973JU2A).

Ground state properties: (1966BA26, , 1969JA1M).

Mass of 9Li: From the Q-value of 18O(7Li, 16O)9Li, the atomic mass excess of 9Li is 24.9654 ± 0.005 MeV (1969NE1E; prelim. results). (1971WA37) adopt 24.966 ± 0.005 MeV. We use the latter value.

 1. 9Li(β-)9Be Qm = 13.618

The half-life of 9Li is 172 ± 3 msec [see (1966LA04)], 176 ± 1 msec (1965DO13), 177 ± 3 msec (1970CH07, 1970CH1T). We adopt τ1/2 = 176 ± 2 msec. See also (1968BO32). 9Li decays to 9Be*(0, 2.43, 2.78): see 9Be and Table 9.7 (in PDF or PS) (1970CH07, 1970CH1T). See also (1963AL18, 1969MA11). Log ft values are listed in Table 9.7 (in PDF or PS): the allowed nature of the transitions to 9Be*(0, 2.43, 2.78) with Jπ = 3/2-, 5/2- and (1/2-) is evidence for Jπ = 3/2 for 9Li(0) (1970CH07).

Eβ-(max) have been measured by (1963AL18, 1963NE07, 1969KL08). Delayed neutrons are observed due to the decay of the neutron unbound states 9Be*(2.43, 2.78): see 9Be. See also (1966BA1A, 1966BA26, 1970DA21, 1971LI1H, 1971WI18, 1972WI28, 1972WI1C, 1973HA49, 1973TO14, 1973WI11; theor.).

 2. 7Li(t, p)9Li Qm = -2.397 Q0 = -2.397 ± 0.020 (1964MI04).

Proton groups are observed to excited states at Ex = 2.691 ± 0.005 MeV (1964MI04), 4.31 ± 0.03, 5.38 ± 0.06 and 6.41 ± 0.02 MeV (1971YO04) [Γcm = 250 ± 30, 600 ± 100, < 100 keV, respectively]. Angular distributions are reported at Et = 11.3 MeV (1964MI04; t0) and 15 MeV (1971YO04; t0, t2, t4). The angular distributions to 9Li(0) are consistent with Jπ = 3/2- and the relative magnitude of the cross section to 9Li*(2.69) is consistent with Jπ = 1/2-: see (1964MI04, 1971YO04). See also (1968HO1F; theor.) and (1969MA11, 1970CH07).

 3. 9Be(n, p)9Li Qm = -12.836

See (1967ME11).

 4. 9Be(d, 2p)9Li Qm = -15.060

See (1951GA30).

 5. 9Be(t, 3He)9Li Qm = -13.599

Not reported.

 6. (a) 11B(γ, 2p)9Li Qm = -30.876 (b) 11B(p, 3p)9Li Qm = -30.876

See (1966LA04).

 7. 11B(n, 3He)9Li Qm = -23.158

Not reported.

 8. 12C(γ, 3p)9Li Qm = -46.834

See (1966LA04).

 9. 18O(7Li, 16O)9Li Qm = -6.103

See "Mass of 9Li" in the GENERAL section here (1969NE1E). See also (1970CH07).