Lithium-9
Properties and data of the isotope 9Li.
Lithium-9 is a radioisotope of the chemical element lithium, which, in addition to the element-specific 3 protons, has 6 neutrons in the atomic nucleus, resulting in the mass number 9. The very short-lived, unstable and therefore radioactive nuclide, which can only be produced artificially, has no practical significance; The study of 9Li serves exclusively academic purposes.
See also: List of individual Lithium isotopes (and general data sources).
General data
Name of the isotope:Lithium-9; Li-9Symbol:9Li or 93LiMass number A:9 (= number of nucleons)Atomic number Z:3 (= number of protons)Neutrons N:6Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):2 (= neutron-proton ratio)Neutron excess (N-Z):3Isotopic mass:9.02679019(20) u (atomic weight of Lithium-9)Nuclide mass:9.0251445 u (calculated nuclear mass without electrons)Mass excess:24.9549 MeVMass defect:0.048674402000001 u (per nucleus)Nuclear binding energy:45.33991342 MeV (per nucleus)
5.03776816 MeV (average binding energy per nucleon)Separation energy:SN = 4.06222(19) MeV (first neutron)
SP = 13.94375(21) MeV (first proton)Half-life:178.3(4) msDecay constant λ:3.8875332616935 s-1Specific activity α:2.601252544400 × 10+23 Bq g-1
7030412282164.3 Ci g-1Spin and parity:
(nuclear angular momentum)3/2-Isobaric spin: 3/2Magnetic dipole moment:μ(μN) = 3.43666(6)Quadrupole moment Q:-0.0304(2) barn (100 fm2)Nuclear g-factor:gl = 2.2911066666667Charge radius:2.245(46) femtometer fmMirror nucleus:Carbon-9Year of discovery:1951
Radioactive Decay
Half-life T½ = 178.3(4) ms respectively 1.783 × 10-1 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 9Be | 49.2 % | 13.60645(20) MeV | |
| β-, n | 8Be | 50.8 % | 11.94192(19) MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 6) and isobaric (same nucleon number A = 9) with Lithium-9. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 6 | Isobar A = 9 |
|---|
| 1 | 7H | |
| 2 | 8He | 9He |
| 3 | 9Li | 9Li |
| 4 | 10Be | 9Be |
| 5 | 11B | 9B |
| 6 | 12C | 9C |
| 7 | 13N | 9N |
| 8 | 14O | |
| 9 | 15F | |
| 10 | 16Ne | |
| 11 | 17Na | |
| 12 | 18Mg | |
External data and identifiers
Last update: 2023-11-06
Perma link: https://www.chemlin.org/isotope/lithium-9
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