Cadmium-98

Properties and data of the isotope ⁹⁸Cd.

Contents

Cadmium-98 is a radioisotope of the chemical element cadmium, which has 50 neutrons in its atomic nucleus in addition to the element-specific 48 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 98. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ⁹⁸Cd is exclusively for academic purposes.

The radioactive isotope was first observed in 1978 during experiments in which a target of natural tin was irradiated with 600 MeV protons in a synchrocyclotron, producing, among other nuclides, cadmium-98 as a product of the spallation reaction.

See also: List of individual Cadmium isotopes (and general data sources).

General data

Name of the isotope:Cadmium-98; Cd-98Symbol:⁹⁸Cd or 9848CdMass number A:98 (= number of nucleons)Atomic number Z:48 (= number of protons)Neutrons N:50Isotopic mass:97.92739(6) u (atomic weight of Cadmium-98)Nuclide mass:97.9010596 u (calculated nuclear mass without electrons)Mass excess:-67.63578 MeVMass defect:0.881457336 u (per nucleus)Nuclear binding energy:821.07221974 MeV (per nucleus)
8.37828796 MeV (average binding energy per nucleon)Separation energy:S_N = 14.974(23) MeV (first neutron)
S_P = 4.021(53) MeV (first proton)Half-life:9.29(10) sDecay constant λ:0.074612183052739 s^-1Specific activity α:4.632217280525 × 10⁺²⁰ Bq g^-1
12519506163.583 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Isobaric spin: 1Mirror nucleus:Tin-98Year of discovery:1978

Radioactive Decay

Half-life T_½ = 9.29(10) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁹⁸Ag	> 99.971 %	5.430(61) MeV
ε, p	⁹⁷Pd	< 0.029 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 50) and isobaric (same nucleon number A = 98) with Cadmium-98. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 50	Isobar A = 98
28	⁷⁸Ni
29	⁷⁹Cu
30	⁸⁰Zn
31	⁸¹Ga
32	⁸²Ge
33	⁸³As
34	⁸⁴Se
35	⁸⁵Br	⁹⁸Br
36	⁸⁶Kr	⁹⁸Kr
37	⁸⁷Rb	⁹⁸Rb
38	⁸⁸Sr	⁹⁸Sr
39	⁸⁹Y	⁹⁸Y
40	⁹⁰Zr	⁹⁸Zr
41	⁹¹Nb	⁹⁸Nb
42	⁹²Mo	⁹⁸Mo
43	⁹³Tc	⁹⁸Tc
44	⁹⁴Ru	⁹⁸Ru
45	⁹⁵Rh	⁹⁸Rh
46	⁹⁶Pd	⁹⁸Pd
47	⁹⁷Ag	⁹⁸Ag
48	⁹⁸Cd	⁹⁸Cd
49	⁹⁹In	⁹⁸In
50	¹⁰⁰Sn	⁹⁸Sn

External data and identifiers

Adopted Levels, Gammas:NuDat 98Cd

Literature and References

[1] - T. Elmroth, E. Hagberg, P.G. Hansen et al.:
Beta-delayed proton emission from ⁹⁷Cd and ⁹⁹Cd.
In: Nuclear Physics A, 304, 2, (1978), DOI 10.1016/0375-9474(78)90246-4.

[2] - A. Blazhev et al.:
High-energy excited states in ⁹⁸Cd.
In: Journal of Physics: Conference Series, 205, 012035, (2010), DOI 10.1088/1742-6596/205/1/012035.