Antimony-123

Properties and data of the isotope ¹²³Sb.

Contents

General data

Name of the isotope:Antimony-123; Sb-123Symbol:¹²³Sb or 12351SbMass number A:123 (= number of nucleons)Atomic number Z:51 (= number of protons)Neutrons N:72Isotopic mass:122.90421(2) u (atomic weight of Antimony-123)Nuclide mass:122.8762341 u (calculated nuclear mass without electrons)Mass excess:-89.22781 MeVMass defect:1.118740584 u (per nucleus)Nuclear binding energy:1042.10014155 MeV (per nucleus)
8.47235887 MeV (average binding energy per nucleon)Separation energy:S_N = 8.9600(21) MeV (first neutron)
S_P = 6.5717(27) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)7/2+Magnetic dipole moment:μ(μ_N) = + 2.5457(12)Charge radius:4.6879(25) femtometer fmYear of discovery:1922

Parent Nuclides

Direct parent isotopes are: ¹²³Sn, ¹²³Te.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Antimony Isotopic mixture	121.760 u	100 %
Isotope ¹²¹Sb	120.90381(2) u	57.21(5) %	stable	5/2+
Isotope ¹²³Sb	122.90421(2) u	42.79(5) %	stable	7/2+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ¹²³Sb

Isotope:¹²³Sb-NMRQuantity:42.79(5) %Spin:7/2+Nuclearmagnetic moment
μ/μ_N:+ 2.5457(12)Gyromagnetic ratio γ:3.4904 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = 0.72734285714286Quadrupole moment Q:- 0.692(14) barn (100 fm²)Resonance frequency:v₀ = 5.5532 at 1 TRelative Sensitivity:0.04659 (H₀ = const.)
2.7390 (v₀ = const.)
[related to ¹H = 1.000]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 72) and isobaric (same nucleon number A = 123) with Antimony-123. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 72	Isobar A = 123
40	¹¹²Zr
41	¹¹³Nb
42	¹¹⁴Mo
43	¹¹⁵Tc
44	¹¹⁶Ru	¹²³Ru
45	¹¹⁷Rh	¹²³Rh
46	¹¹⁸Pd	¹²³Pd
47	¹¹⁹Ag	¹²³Ag
48	¹²⁰Cd	¹²³Cd
49	¹²¹In	¹²³In
50	¹²²Sn	¹²³Sn
51	¹²³Sb	¹²³Sb
52	¹²⁴Te	¹²³Te
53	¹²⁵I	¹²³I
54	¹²⁶Xe	¹²³Xe
55	¹²⁷Cs	¹²³Cs
56	¹²⁸Ba	¹²³Ba
57	¹²⁹La	¹²³La
58	¹³⁰Ce	¹²³Ce
59	¹³¹Pr	¹²³Pr
60	¹³²Nd
61	¹³³Pm
62	¹³⁴Sm
63	¹³⁵Eu
64	¹³⁶Gd
65	¹³⁷Tb
66	¹³⁸Dy