Cadmium-126

Properties and data of the isotope ¹²⁶Cd.

Content

General data

Name of the isotope:Cadmium-126; Cd-126Symbol:¹²⁶Cd or 12648CdMass number A:126 (= number of nucleons)Atomic number Z:48 (= number of protons)Neutrons N:78Isotopic mass:125.9224291(27) u (atomic weight of Cadmium-126)Nuclide mass:125.8960987 u (calculated nuclear mass without electrons)Mass excess:-72.25683 MeVMass defect:1.129035884 u (per nucleus)Nuclear binding energy:1051.69015173 MeV (per nucleus)
8.34674724 MeV (average binding energy per nucleon)Separation energy:S_N = 6.98(4) MeV (first neutron)
S_P = 15.03(43) MeV (first proton)Half-life:515(17) msDecay constant λ:1.3459168554562 s^-1Specific activity α:6.484240711456 × 10⁺²¹ Bq g^-1
175249748958.28 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1978

Radioactive Decay

Half-life T_½ = 515(17) ms respectively 5.15 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹²⁶In	100 %	5.516(27) MeV

Parent Nuclides

Direct parent isotope is: ¹²⁶Ag.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 78) and isobaric (same nucleon number A = 126) with Cadmium-126. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 78	Isobar A = 126
43	¹²¹Tc
44	¹²²Ru
45	¹²³Rh	¹²⁶Rh
46	¹²⁴Pd	¹²⁶Pd
47	¹²⁵Ag	¹²⁶Ag
48	¹²⁶Cd	¹²⁶Cd
49	¹²⁷In	¹²⁶In
50	¹²⁸Sn	¹²⁶Sn
51	¹²⁹Sb	¹²⁶Sb
52	¹³⁰Te	¹²⁶Te
53	¹³¹I	¹²⁶I
54	¹³²Xe	¹²⁶Xe
55	¹³³Cs	¹²⁶Cs
56	¹³⁴Ba	¹²⁶Ba
57	¹³⁵La	¹²⁶La
58	¹³⁶Ce	¹²⁶Ce
59	¹³⁷Pr	¹²⁶Pr
60	¹³⁸Nd	¹²⁶Nd
61	¹³⁹Pm	¹²⁶Pm
62	¹⁴⁰Sm
63	¹⁴¹Eu
64	¹⁴²Gd
65	¹⁴³Tb
66	¹⁴⁴Dy
67	¹⁴⁵Ho
68	¹⁴⁶Er
69	¹⁴⁷Tm
70	¹⁴⁸Yb
71	¹⁴⁹Lu