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Cerium-126

Properties and data of the isotope 126Ce.


Contents

See also: list of Cerium isotopes.

 

General data

Name of the isotope:Cerium-126; Ce-126Symbol:126Ce or 12658CeMass number A:126 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:68Isotopic mass:125.92397(3) u (atomic weight of Cerium-126)Nuclide mass:125.8921546 u (calculated nuclear mass without electrons)Mass excess:-70.82149 MeVMass defect:1.119096144 u (per nucleus)Nuclear binding energy:1042.43134356 MeV (per nucleus)
8.27326463 MeV (average binding energy per nucleon)
Separation energy:SN = 12.23(29) MeV (first neutron)
SP = 4.35(4) MeV (first proton)
Half-life:51.0(3) sDecay constant λ:0.01359112118745 s-1Specific activity α:6.547811698823 × 10+19 Bq g-1
1769678837.5199 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Year of discovery:1978

 

Radioactive Decay

Half-life T½ = 51.0(3) s respectively 5.10 × 101 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
EC/β+126La100 %4.15(9) MeV

 

Parent Nuclides

Direct parent isotope is: 126Pr.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 68) and isobaric (same nucleon number A = 126) with Cerium-126. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 68Isobar A = 126
38106Sr
39107Y
40108Zr
41109Nb
42110Mo
43111Tc
44112Ru
45113Rh126Rh
46114Pd126Pd
47115Ag126Ag
48116Cd126Cd
49117In126In
50118Sn126Sn
51119Sb126Sb
52120Te126Te
53121I126I
54122Xe126Xe
55123Cs126Cs
56124Ba126Ba
57125La126La
58126Ce126Ce
59127Pr126Pr
60128Nd126Nd
61129Pm126Pm
62130Sm
63131Eu

 

External data and identifiers

Adopted Levels, Gammas:NuDat 126Ce

 


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Last update: 2020-10-19


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