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Scandium-40

Properties and data of the isotope 40Sc.


Content

See also: list of Scandium isotopes.

 

General data

Name of the isotope:Scandium-40; Sc-40Symbol:40Sc or 4021ScMass number A:40 (= number of nucleons)Atomic number Z:21 (= number of protons)Neutrons N:19Isotopic mass:39.977967(3) u (atomic weight of Scandium-40)Nuclide mass:39.966447 u (calculated nuclear mass without electrons)Mass excess:-20.52361 MeVMass defect:0.350992076 u (per nucleus)Nuclear binding energy:326.94701284 MeV (per nucleus)
8.17367532 MeV (average binding energy per nucleon)
Separation energy:SN = 14.422(24) MeV (first neutron)
SP = 0.5296(29) MeV (first proton)
Half-life:182.3(7) msDecay constant λ:3.8022335741083 s-1Specific activity α:5.871175939913 × 10+22 Bq g-1
1586804308084.6 Ci g-1
Spin and parity:
(nuclear angular momentum)
4-Isobaric spin: 1Mirror nucleus:Potassium-40Year of discovery:1955

 

Radioactive Decay

Half-life T½ = 182.3(7) ms respectively 1.823 × 10-1 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
EE/β+40Ca99.54 %14.320(28) MeV
EE, p39K0.44 %5.991 MeV
EE, α36Ar0.017 %7,279 MeV

 

Parent Nuclides

Direct parent isotope is: 40Ti.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 19) and isobaric (same nucleon number A = 40) with Scandium-40. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 19Isobar A = 40
827O
928F
1029Ne
1130Na
1231Mg40Mg
1332Al40Al
1433Si40Si
1534P40P
1635S40S
1736Cl40Cl
1837Ar40Ar
1938K40K
2039Ca40Ca
2140Sc40Sc
2241Ti40Ti
2342V40V
2443Cr
2544Mn
2645Fe
2746Co

 

External data and identifiers

Adopted Levels, Gammas:NuDat 40Sc

 


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Last update: 2023-10-04


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