Aluminium-22

Properties and data of the isotope ²²Al.

Content

General data

Name of the isotope:Aluminium-22; Al-22Symbol:²²Al or 2213AlMass number A:22 (= number of nucleons)Atomic number Z:13 (= number of protons)Neutrons N:9Isotopic mass:22.01954(43) u (atomic weight of Aluminium-22)Nuclide mass:22.0124085 u (calculated nuclear mass without electrons)Mass excess:18.20139 MeVMass defect:0.16016966 u (per nucleus)Nuclear binding energy:149.19707727 MeV (per nucleus)
6.78168533 MeV (average binding energy per nucleon)Separation energy:S_N = 16.86(72) MeV (first neutron)Half-life:91.1(5) msDecay constant λ:7.6086408403946 s^-1Specific activity α:2.082741222432 × 10⁺²³ Bq g^-1
5629030330899.7 Ci g^-1Spin and parity:
(nuclear angular momentum)(4)+Mirror nucleus:Fluorine-22Year of discovery:1982

Radioactive Decay

Half-life T_½ = 91.1(5) ms respectively 9.11 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy
β⁺	²²Mg	43.862 %	18.6(4) MeV
β⁺, p	²¹Na	55 %
β⁺, 2p	²⁰Ne	1.1 %
β⁺, α	¹⁸Ne	0.038 %

Parent Nuclides

Direct parent isotope is: ²²Si.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 9) and isobaric (same nucleon number A = 22) with Aluminium-22. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 9	Isobar A = 22
3	¹²Li
4	¹³Be
5	¹⁴B
6	¹⁵C	²²C
7	¹⁶N	²²N
8	¹⁷O	²²O
9	¹⁸F	²²F
10	¹⁹Ne	²²Ne
11	²⁰Na	²²Na
12	²¹Mg	²²Mg
13	²²Al	²²Al
14	²³Si	²²Si
15	²⁴P