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Magnesium-20

Properties and data of the isotope 20Mg.


Content

See also: list of Magnesium isotopes.

 

General data

Name of the isotope:Magnesium-20; Mg-20Symbol:20Mg or 2012MgMass number A:20 (= number of nucleons)Atomic number Z:12 (= number of protons)Neutrons N:8Isotopic mass:20.0187631(2) u (atomic weight of Magnesium-20)Nuclide mass:20.0121802 u (calculated nuclear mass without electrons)Mass excess:17.47772 MeVMass defect:0.144456612 u (per nucleus)Nuclear binding energy:134.56046734 MeV (per nucleus)
6.72802337 MeV (average binding energy per nucleon)
Separation energy:SN = 22.42(5) MeV (first neutron)
SP = 2.741(11) MeV (first proton)
Half-life:93(5) msDecay constant λ:7.4531954898919 s-1Specific activity α:2.244209654838 × 10+23 Bq g-1
6065431499564.1 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Mirror nucleus:Oxygen-20Year of discovery:1974

 

Radioactive Decay

Half-life T½ = 93(5) ms respectively 9.3 × 10-2 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β+20Na69.7 %10.6271(22) MeV
β+, p19Ne30.3(12) %8.530 MeV

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 8) and isobaric (same nucleon number A = 20) with Magnesium-20. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 8Isobar A = 20
210He
311Li
412Be
513B20B
614C20C
715N20N
816O20O
917F20F
1018Ne20Ne
1119Na20Na
1220Mg20Mg
1321Al
1422Si

 

External data and identifiers

Adopted Levels, Gammas:NuDat 20Mg

 


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Last update: 2023-10-03


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