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Cerium-122

Properties and data of the isotope 122Ce.


Contents

See also: list of Cerium isotopes.

 

General data

Name of the isotope:Cerium-122; Ce-122Symbol:122Ce or 12258CeMass number A:122 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:64Isotopic mass:121.93787(43) u (atomic weight of Cerium-122)Nuclide mass:121.9060546 u (calculated nuclear mass without electrons)Mass excess:-57.87372 MeVMass defect:1.07053648 u (per nucleus)Nuclear binding energy:997.1983079 MeV (per nucleus)
8.17375662 MeV (average binding energy per nucleon)
Separation energy:SN = 13.25(57) MeV (first neutron)
SP = 2.97(50) MeV (first proton)
Half-life:2 sDecay constant λ:0.34657359027997 s-1Specific activity α:1.724888412396 × 10+21 Bq g-1
46618605740.451 Ci g-1
Spin and parity:
(nuclear angular momentum)
0+Year of discovery:2005

 

Radioactive Decay

Half-life T½ = 2 s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
EC, p121Ba?6.67(50) MeV
EC, β+122La?

 

Parent Nuclides

Direct parent isotope is: 122Pr.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 64) and isobaric (same nucleon number A = 122) with Cerium-122. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 64Isobar A = 122
36100Kr
37101Rb
38102Sr
39103Y
40104Zr
41105Nb
42106Mo
43107Tc
44108Ru122Ru
45109Rh122Rh
46110Pd122Pd
47111Ag122Ag
48112Cd122Cd
49113In122In
50114Sn122Sn
51115Sb122Sb
52116Te122Te
53117I122I
54118Xe122Xe
55119Cs122Cs
56120Ba122Ba
57121La122La
58122Ce122Ce
59123Pr122Pr
60124Nd

 

External data and identifiers

Adopted Levels, Gammas:NuDat 122Ce

 


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Last update: 2020-10-19


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