Promethium-133m
Properties and data of the isotope 133mPm.
See also: list of Promethium isotopes.
General data
Name of the isotope:Promethium-133m; Pm-133mSymbol:133mPm or 133m61PmMass number A:133 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:72Isotopic mass:132.92978(5) u (atomic weight of Promethium-133m)
Excitation energy: 129.7(7) keVNuclide mass:132.8963192 u (calculated nuclear mass without electrons)Mass excess:-65.40951 MeVMass defect:1.171420904 u (per nucleus)Nuclear binding energy:1091.17154355 MeV (per nucleus)
8.20429732 MeV (average binding energy per nucleon)Half-life:8.8 sDecay constant λ:0.07876672506363 s-1Specific activity α:3.593517525826 × 10+20 Bq g-1
9712209529.2605 Ci g-1Spin and parity:
(nuclear angular momentum)(11/2-)
Radioactive Decay
Half-life T½ = 8.8 s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 133Nd | ? | | |
Iso | 133Pm | ? | | |
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 |
---|
133Pm | | 13.5(21) s | (3/2+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 72) and isobaric (same nucleon number A = 133) with Promethium-133m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 72 | Isobar A = 133 |
40 | 112Zr | |
41 | 113Nb | |
42 | 114Mo | |
43 | 115Tc | |
44 | 116Ru | |
45 | 117Rh | |
46 | 118Pd | |
47 | 119Ag | |
48 | 120Cd | 133Cd |
49 | 121In | 133In |
50 | 122Sn | 133Sn |
51 | 123Sb | 133Sb |
52 | 124Te | 133Te |
53 | 125I | 133I |
54 | 126Xe | 133Xe |
55 | 127Cs | 133Cs |
56 | 128Ba | 133Ba |
57 | 129La | 133La |
58 | 130Ce | 133Ce |
59 | 131Pr | 133Pr |
60 | 132Nd | 133Nd |
61 | 133Pm | 133Pm |
62 | 134Sm | 133Sm |
63 | 135Eu | 133Eu |
64 | 136Gd | |
65 | 137Tb | |
66 | 138Dy | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/promethium-133m
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