Neodymium-137m
Properties and data of the isotope 137Nd.
See also: list of Neodymium isotopes.
General data
Name of the isotope:Neodymium-137m; Nd-137mSymbol:137Nd or 13760NdMass number A:137 (= number of nucleons)Atomic number Z:60 (= number of protons)Neutrons N:77Isotopic mass:136.914562(13) u (atomic weight of Neodymium-137m)
Excitation energy: 519.43(20) keVNuclide mass:136.8816497 u (calculated nuclear mass without electrons)Mass excess:-79.58498 MeVMass defect:1.222138452 u (per nucleus)Nuclear binding energy:1138.41463521 MeV (per nucleus)
8.30959588 MeV (average binding energy per nucleon)Half-life:1.60(15) sDecay constant λ:0.43321698784997 s-1Specific activity α:1.918304208639 × 10+21 Bq g-1
51846059692.965 Ci g-1Spin and parity:
(nuclear angular momentum)11/2-
Radioactive Decay
Half-life T½ = 1.60(15) s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
Iso | 137Nd | 100 % | | |
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 |
---|
137Nd | | 38.5(15) min | 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 = 137) with Neodymium-137m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 77 | Isobar A = 137 |
43 | 120Tc | |
44 | 121Ru | |
45 | 122Rh | |
46 | 123Pd | |
47 | 124Ag | |
48 | 125Cd | |
49 | 126In | 137In |
50 | 127Sn | 137Sn |
51 | 128Sb | 137Sb |
52 | 129Te | 137Te |
53 | 130I | 137I |
54 | 131Xe | 137Xe |
55 | 132Cs | 137Cs |
56 | 133Ba | 137Ba |
57 | 134La | 137La |
58 | 135Ce | 137Ce |
59 | 136Pr | 137Pr |
60 | 137Nd | 137Nd |
61 | 138Pm | 137Pm |
62 | 139Sm | 137Sm |
63 | 140Eu | 137Eu |
64 | 141Gd | 137Gd |
65 | 142Tb | 137Tb |
66 | 143Dy | |
67 | 144Ho | |
68 | 145Er | |
69 | 146Tm | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/neodymium-137m
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