About   |   More   |   Search
ChemLin Logo

Indium-129m2

Properties and data of the isotope 129In.

Content
General Data
Radioactive Decay
Isotones und Isobares

See also: list of Indium isotopes.

 

General data

Name of the isotope:Indium-129m2; In-129m2Symbol:129In or 12949InMass number A:129 (= number of nucleons)Atomic number Z:49 (= number of protons)Neutrons N:80Isotopic mass:128.9218055(29) u (atomic weight of Indium-129m2)
Excitation energy: 1630(56) keVNuclide mass:128.8949266 u (calculated nuclear mass without electrons)Mass excess:-72.83771 MeVMass defect:1.154814348 u (per nucleus)Nuclear binding energy:1075.70263628 MeV (per nucleus)
8.33878013 MeV (average binding energy per nucleon)Half-life:0.67(10) sDecay constant λ:1.0345480306865 s-1Specific activity α:4.86733903684 × 10+21 Bq g-1
131549703698.57 Ci g-1Spin and parity:
(nuclear angular momentum)(23/2-)

 

Radioactive Decay

Half-life T½ = 0.67(10) s respectively 6.7 × 10-1 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-129Snca. 100 %
Iso129In?

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
129In611(5) ms(9/2+)
129mIn459(5) keV1.23(3) s(1/2-)
129m3In1687.97(25) keV8.7(7) μs(17/2-)
129m4In1911(56) keV110(15) ms(29/2+)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 80) and isobaric (same nucleon number A = 129) with Indium-129m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 80Isobar A = 129
44124Ru
45125Rh
46126Pd129Pd
47127Ag129Ag
48128Cd129Cd
49129In129In
50130Sn129Sn
51131Sb129Sb
52132Te129Te
53133I129I
54134Xe129Xe
55135Cs129Cs
56136Ba129Ba
57137La129La
58138Ce129Ce
59139Pr129Pr
60140Nd129Nd
61141Pm129Pm
62142Sm129Sm
63143Eu
64144Gd
65145Tb
66146Dy
67147Ho
68148Er
69149Tm
70150Yb
71151Lu

 

More Chemistry

isotopes

 

 

 

 

About ChemLin

home

about

contact, imprint

cookie and privacy policy

terms of use

Social Media

Facebook

LinkedIn

Twitter

 

 

Last update: 2020-10-17

© 1996 - 2024 ChemLin