Indium-127
Properties and data of the isotope 127In.
See also: List of individual Indium isotopes (and general data sources).
General data
Name of the isotope:Indium-127; In-127Symbol:127In or 12749InMass number A:127 (= number of nucleons)Atomic number Z:49 (= number of protons)Neutrons N:78Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.5918367346939 (= neutron-proton ratio)Neutron excess (N-Z):29Isotopic mass:126.917449(23) u (atomic weight of Indium-127)Nuclide mass:126.8905701 u (calculated nuclear mass without electrons)Mass excess:-76.89576 MeVMass defect:1.141841016 u (per nucleus)Nuclear binding energy:1063.61805536 MeV (per nucleus)
8.37494532 MeV (average binding energy per nucleon)Separation energy:SN = 7.19(3) MeV (first neutron)
SP = 11.928(21) MeV (first proton)Half-life:1.09(1) sDecay constant λ:0.63591484455041 s-1Specific activity α:3.039340292704 × 10+21 Bq g-1
82144332235.249 Ci g-1Spin and parity:
(nuclear angular momentum)(9/2+)Magnetic dipole moment:μ(μN) = +5.514(8)Nuclear g-factor:gl = 1.2253333333333Charge radius:4.6733(71) femtometer fmYear of discovery:1975
Radioactive Decay
Half-life T½ = 1.09(1) s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 127Sn | ≥ 99.97 % | 6.575(19) MeV | |
| β-, n | 126Sn | ≤ 0.03 % | 1.048(24) MeV | |
Parent Nuclides
Direct parent isotope is: 127Cd.
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 |
|---|
| 127m1In | 408.9(3) keV | 3.67(4) s | (1/2-) |
| 127m2In | 1863(58) keV | 1.04(10) s | (21/2-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 78) and isobaric (same nucleon number A = 127) with Indium-127. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 78 | Isobar A = 127 |
|---|
| 43 | 121Tc | |
| 44 | 122Ru | |
| 45 | 123Rh | 127Rh |
| 46 | 124Pd | 127Pd |
| 47 | 125Ag | 127Ag |
| 48 | 126Cd | 127Cd |
| 49 | 127In | 127In |
| 50 | 128Sn | 127Sn |
| 51 | 129Sb | 127Sb |
| 52 | 130Te | 127Te |
| 53 | 131I | 127I |
| 54 | 132Xe | 127Xe |
| 55 | 133Cs | 127Cs |
| 56 | 134Ba | 127Ba |
| 57 | 135La | 127La |
| 58 | 136Ce | 127Ce |
| 59 | 137Pr | 127Pr |
| 60 | 138Nd | 127Nd |
| 61 | 139Pm | 127Pm |
| 62 | 140Sm | |
| 63 | 141Eu | |
| 64 | 142Gd | |
| 65 | 143Tb | |
| 66 | 144Dy | |
| 67 | 145Ho | |
| 68 | 146Er | |
| 69 | 147Tm | |
| 70 | 148Yb | |
| 71 | 149Lu | |
External data and identifiers
Last update: 2020-10-17
Perma link: https://www.chemlin.org/isotope/indium-127
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