Calcium-54

Properties and data of the isotope ⁵⁴Ca.

Content

General data

Name of the isotope:Calcium-54; Ca-54Symbol:⁵⁴Ca or 5420CaMass number A:54 (= number of nucleons)Atomic number Z:20 (= number of protons)Neutrons N:34Isotopic mass:53.97299(5) u (atomic weight of Calcium-54)Nuclide mass:53.9620186 u (calculated nuclear mass without electrons)Mass excess:-25.15965 MeVMass defect:0.478117784 u (per nucleus)Nuclear binding energy:445.36384709 MeV (per nucleus)
8.24747865 MeV (average binding energy per nucleon)Separation energy:S_N = 3.84(7) MeV (first neutron)
S_P = 20.15(12) MeV (first proton)Half-life:107(14) msDecay constant λ:6.4780110332705 s^-1Specific activity α:7.360659421618 × 10⁺²² Bq g^-1
1989367411248.3 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1997

Radioactive Decay

Half-life T_½ = 107(14) ms respectively 1.07 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	⁵⁴Sc	100 %	8.73(28) MeV
β^-, n	⁵³Sc	?	5.67(11) MeV
β^-, 2n	⁵²Sc	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 34) and isobaric (same nucleon number A = 54) with Calcium-54. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 34	Isobar A = 54
17	⁵¹Cl
18	⁵²Ar
19	⁵³K	⁵⁴K
20	⁵⁴Ca	⁵⁴Ca
21	⁵⁵Sc	⁵⁴Sc
22	⁵⁶Ti	⁵⁴Ti
23	⁵⁷V	⁵⁴V
24	⁵⁸Cr	⁵⁴Cr
25	⁵⁹Mn	⁵⁴Mn
26	⁶⁰Fe	⁵⁴Fe
27	⁶¹Co	⁵⁴Co
28	⁶²Ni	⁵⁴Ni
29	⁶³Cu	⁵⁴Cu
30	⁶⁴Zn	⁵⁴Zn
31	⁶⁵Ga
32	⁶⁶Ge
33	⁶⁷As
34	⁶⁸Se
35	⁶⁹Br
36	⁷⁰Kr
37	⁷¹Rb