Silver-129
Properties and data of the isotope 129Ag.
See also: list of Silver isotopes.
General data
Name of the isotope:Silver-129; Ag-129Symbol:129Ag or 12947AgMass number A:129 (= number of nucleons)Atomic number Z:47 (= number of protons)Neutrons N:82Isotopic mass:128.94420(43) u (atomic weight of Silver-129)Nuclide mass:128.9184181 u (calculated nuclear mass without electrons)Mass excess:-51.97737 MeVMass defect:1.134099616 u (per nucleus)Nuclear binding energy:1056.40698771 MeV (per nucleus)
8.18920146 MeV (average binding energy per nucleon)Separation energy:SN = 5.43(50) MeV (first neutron)
SP = 14.78(64) MeV (first proton)Half-life:46 msDecay constant λ:15.068416968694 s-1Specific activity α:7.089385118885 × 10+22 Bq g-1
1916050032131.3 Ci g-1Spin and parity:
(nuclear angular momentum)(9/2+)Year of discovery:2000
Radioactive Decay
Half-life T½ = 46 ms respectively 4.6 × 10-2 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 129Cd | 100 % | 11.08(40) MeV | |
β-, n | 128Cd | ? | 7.19(40) 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 |
---|
129mAg | +x keV | 160 ms | (1/2-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 82) and isobaric (same nucleon number A = 129) with Silver-129. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 82 | Isobar A = 129 |
45 | 127Rh | |
46 | 128Pd | 129Pd |
47 | 129Ag | 129Ag |
48 | 130Cd | 129Cd |
49 | 131In | 129In |
50 | 132Sn | 129Sn |
51 | 133Sb | 129Sb |
52 | 134Te | 129Te |
53 | 135I | 129I |
54 | 136Xe | 129Xe |
55 | 137Cs | 129Cs |
56 | 138Ba | 129Ba |
57 | 139La | 129La |
58 | 140Ce | 129Ce |
59 | 141Pr | 129Pr |
60 | 142Nd | 129Nd |
61 | 143Pm | 129Pm |
62 | 144Sm | 129Sm |
63 | 145Eu | |
64 | 146Gd | |
65 | 147Tb | |
66 | 148Dy | |
67 | 149Ho | |
68 | 150Er | |
69 | 151Tm | |
70 | 152Yb | |
71 | 153Lu | |
72 | 154Hf | |
73 | 155Ta | |
External data and identifiers
Last update: 2020-10-16
Perma link: https://www.chemlin.org/isotope/silver-129
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