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Cerium-125

Properties and data of the isotope 125Ce.


Contents

See also: list of Cerium isotopes.

 

General data

Name of the isotope:Cerium-125; Ce-125Symbol:125Ce or 12558CeMass number A:125 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:67Isotopic mass:124.92844(21) u (atomic weight of Cerium-125)Nuclide mass:124.8966246 u (calculated nuclear mass without electrons)Mass excess:-66.65771 MeVMass defect:1.105961228 u (per nucleus)Nuclear binding energy:1030.19624811 MeV (per nucleus)
8.24156998 MeV (average binding energy per nucleon)
Separation energy:SN = 9.81(36) MeV (first neutron)
SP = 3.69(20) MeV (first proton)
Half-life:9.7(3) sDecay constant λ:0.071458472222675 s-1Specific activity α:3.47042730129 × 10+20 Bq g-1
9379533246.7486 Ci g-1
Spin and parity:
(nuclear angular momentum)
(7/2-)Year of discovery:1978

 

Radioactive Decay

Half-life T½ = 9.7(3) s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
EC/β+125La< 100 %7.10(20) MeV
β+, p124Ba?

 

Parent Nuclides

Direct parent isotope is: 125Pr.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 67) and isobaric (same nucleon number A = 125) with Cerium-125. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 67Isobar A = 125
38105Sr
39106Y
40107Zr
41108Nb
42109Mo
43110Tc
44111Ru
45112Rh125Rh
46113Pd125Pd
47114Ag125Ag
48115Cd125Cd
49116In125In
50117Sn125Sn
51118Sb125Sb
52119Te125Te
53120I125I
54121Xe125Xe
55122Cs125Cs
56123Ba125Ba
57124La125La
58125Ce125Ce
59126Pr125Pr
60127Nd125Nd
61128Pm
62129Sm
63130Eu

 

External data and identifiers

Adopted Levels, Gammas:NuDat 125Ce

 


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Last update: 2020-10-19


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