Cerium-135m
Properties and data of the isotope 135Ce.
See also: list of Cerium isotopes.
General data
Name of the isotope:Cerium-135m; Ce-135mSymbol:135Ce or 13558CeMass number A:135 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:77Isotopic mass:134.909161(11) u (atomic weight of Cerium-135m)
Excitation energy: 445.81(21) keVNuclide mass:134.8773456 u (calculated nuclear mass without electrons)Mass excess:-84.61598 MeVMass defect:1.211889388 u (per nucleus)Nuclear binding energy:1128.86769359 MeV (per nucleus)
8.36198292 MeV (average binding energy per nucleon)Half-life:20(1) sDecay constant λ:0.034657359027997 s-1Specific activity α:1.55754849179 × 10+20 Bq g-1
4209590518.3541 Ci g-1Spin and parity:
(nuclear angular momentum)(11/2-)
Radioactive Decay
Half-life T½ = 20(1) s respectively 2.0 × 101 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
Iso | 135Ce | 100 % | 0.446 MeV | |
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
135Ce | | 17.7(3) h | 1/2(+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 77) and isobaric (same nucleon number A = 135) with Cerium-135m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 77 | Isobar A = 135 |
43 | 120Tc | |
44 | 121Ru | |
45 | 122Rh | |
46 | 123Pd | |
47 | 124Ag | |
48 | 125Cd | |
49 | 126In | 135In |
50 | 127Sn | 135Sn |
51 | 128Sb | 135Sb |
52 | 129Te | 135Te |
53 | 130I | 135I |
54 | 131Xe | 135Xe |
55 | 132Cs | 135Cs |
56 | 133Ba | 135Ba |
57 | 134La | 135La |
58 | 135Ce | 135Ce |
59 | 136Pr | 135Pr |
60 | 137Nd | 135Nd |
61 | 138Pm | 135Pm |
62 | 139Sm | 135Sm |
63 | 140Eu | 135Eu |
64 | 141Gd | 135Gd |
65 | 142Tb | 135Tb |
66 | 143Dy | |
67 | 144Ho | |
68 | 145Er | |
69 | 146Tm | |
External data and identifiers
Last update: 2020-10-19
Perma link: https://www.chemlin.org/isotope/cerium-135m
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