Lithium-5

Properties and data of the isotope ⁵Li.

Contents

Lithium-5 is a radioisotope of the chemical element Lithium, which, in addition to the element-specific 3 protons, has 2 neutrons in the atomic nucleus, resulting in the mass number 5. The very short-lived, unstable and therefore radioactive nuclide, which can only be produced artificially, has no practical significance; The study of ⁵Li serves exclusively academic purposes.

See also: List of individual Lithium isotopes (and general data sources).

General data

Name of the isotope:Lithium-5; Li-5Symbol:⁵Li or 53LiMass number A:5 (= number of nucleons)Atomic number Z:3 (= number of protons)Neutrons N:2Isotopic mass:5.01254(5) u (atomic weight of Lithium-5)Nuclide mass:5.0108943 u (calculated nuclear mass without electrons)Mass excess:11.68093 MeVMass defect:0.028264928 u (per nucleus)Nuclear binding energy:26.32861084 MeV (per nucleus)
5.26572217 MeV (average binding energy per nucleon)Separation energy:S_N = 21.716(218) MeV (first neutron)Half-life:370(3) × 10^-24 sDecay constant λ:1.873370758270 × 10⁺²¹ s^-1Specific activity α:2.256340517837 × 10⁺⁴⁴ Bq g^-1
6.098217615777 × 10⁺³³ Ci g^-1Spin and parity:
(nuclear angular momentum)3/2-Isobaric spin: 1/2Mirror nucleus:Helium-5Year of discovery:1941

Radioactive Decay

Half-life T_½ = 370(3) × 10^-24 s respectively 3.70 × 10^-22 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
p	⁴He	?	26.3 MeV

Parent Nuclides

Direct parent isotope is: ⁹C.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 2) and isobaric (same nucleon number A = 5) with Lithium-5. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.