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Calcium-48

Properties and data of the isotope 48Ca.


Content

 

Calcium-48 isotope

See also: list of Calcium isotopes.

 

General data

Name of the isotope:Calcium-48; Ca-48Symbol:48Ca or 4820CaMass number A:48 (= number of nucleons)Atomic number Z:20 (= number of protons)Neutrons N:28Isotopic mass:47.952522654(19) u (atomic weight of Calcium-48)Nuclide mass:47.9415512 u (calculated nuclear mass without electrons)Mass excess:-44.22486 MeVMass defect:0.446595634 u (per nucleus)Nuclear binding energy:416.0011535 MeV (per nucleus)
8.6666907 MeV (average binding energy per nucleon)
Separation energy:SN = 9.9515(22) MeV (first neutron)
SP = 15.8019(14) MeV (first proton)
Half-life:5.3 × 1019 aDecay constant λ:4.147085454658 × 10-28 s-1Specific activity α:5.313687822584 × 10-6 Bq g-1
1.436131843941 × 10-16 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Charge radius:3.4771(20) femtometer fmMirror nucleus:Nickel-48Year of discovery:1938

 

Radioactive Decay

Half-life T½ = 5.3 × 1019 a respectively 1.6714080 × 1027 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-48Sc25 %0.2793 MeV
-48Ti75 %4.272 MeV

 

Parent Nuclides

Direct parent isotopes are: 48K, 49K.

 

Occurrence

Comparison of the natural Calcium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Calcium
Isotopic mixture
40.078 u100 %
Isotope 40Ca39.9625909(2) u96.941(156) %stable0+
Isotope 41Ca40.96227792(15) u
[trace]
9.94(15) × 104 a7/2-
Isotope 42Ca41.958618(1) u0.647(23) %stable0+
Isotope 43Ca42.958766(2) u0.135(10) %stable7/2-
Isotope 44Ca43.955482(2) u2.086(110) %stable0+
Isotope 46Ca45.95369(2) u0.004(3) %stable0+
Isotope 48Ca47.952522654(19) u0.187(21) %5.3 × 1019 a0+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 28) and isobaric (same nucleon number A = 48) with Calcium-48. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 28Isobar A = 48
1139Na
1240Mg
1341Al
1442Si
1543P
1644S48S
1745Cl48Cl
1846Ar48Ar
1947K48K
2048Ca48Ca
2149Sc48Sc
2250Ti48Ti
2351V48V
2452Cr48Cr
2553Mn48Mn
2654Fe48Fe
2755Co48Co
2856Ni48Ni
2957Cu
3058Zn
3159Ga
3260Ge

 

External data and identifiers

Adopted Levels, Gammas:NuDat 48Ca

 

Literature and References

[1] - A. Balysh, A. De Silva, V. I. Lebedev et al.:
Double Beta Decay of 48Ca.
In: Physical Review Letters, 77, 5186, (1996), DOI 10.1103/PhysRevLett.77.5186.

[2] - Alexander Barabash:
Precise Half-Life Values for Two-Neutrino Double-β Decay: 2020 Review.
In: Universe, 6(10), 159, (2020), DOI 10.3390/universe6100159.

 


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Last update: 2023-10-25


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