Iodine-127

Properties and data of the isotope ¹²⁷I.

Content

General data

Name of the isotope:Iodine-127; I-127Other names:Jod-127Symbol:¹²⁷I or 12753IMass number A:127 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:74Isotopic mass:126.90447(3) u (atomic weight of Iodine-127)Nuclide mass:126.8753971 u (calculated nuclear mass without electrons)Mass excess:-88.98562 MeVMass defect:1.15146048 u (per nucleus)Nuclear binding energy:1072.57852836 MeV (per nucleus)
8.44550022 MeV (average binding energy per nucleon)Separation energy:S_N = 9.1439(27) MeV (first neutron)
S_P = 6.208(4) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μ_N) = +2.8087(14)Charge radius:4.7500(81) femtometer fmYear of discovery:1920

Parent Nuclides

Direct parent isotopes are: ¹²⁷Xe, ¹²⁷Te.

Occurrence

Comparison of the natural Iodine isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Iodine Isotopic mixture	126.90447 u	100 %
Isotope ¹²⁷I	126.90447(3) u	100 %	stable	5/2+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ¹²⁷I

Isotope:¹²⁷I-NMRQuantity:100 %Spin:5/2+Nuclearmagnetic moment
μ/μ_N:+2.8087(14)Gyromagnetic ratio γ:5.3817 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = 1.12348Quadrupole moment Q:- 0.68822 barn (100 fm²)Resonance frequency:v₀ = 8.5778 at 1 TRelative Sensitivity:0.09540 (H₀ = const.)
2.3504 (v₀ = const.)
[related to ¹H = 1.000]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 74) and isobaric (same nucleon number A = 127) with Iodine-127. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 74	Isobar A = 127
41	¹¹⁵Nb
42	¹¹⁶Mo
43	¹¹⁷Tc
44	¹¹⁸Ru
45	¹¹⁹Rh	¹²⁷Rh
46	¹²⁰Pd	¹²⁷Pd
47	¹²¹Ag	¹²⁷Ag
48	¹²²Cd	¹²⁷Cd
49	¹²³In	¹²⁷In
50	¹²⁴Sn	¹²⁷Sn
51	¹²⁵Sb	¹²⁷Sb
52	¹²⁶Te	¹²⁷Te
53	¹²⁷I	¹²⁷I
54	¹²⁸Xe	¹²⁷Xe
55	¹²⁹Cs	¹²⁷Cs
56	¹³⁰Ba	¹²⁷Ba
57	¹³¹La	¹²⁷La
58	¹³²Ce	¹²⁷Ce
59	¹³³Pr	¹²⁷Pr
60	¹³⁴Nd	¹²⁷Nd
61	¹³⁵Pm	¹²⁷Pm
62	¹³⁶Sm
63	¹³⁷Eu
64	¹³⁸Gd
65	¹³⁹Tb
66	¹⁴⁰Dy
67	¹⁴¹Ho