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Cesium-133

Properties and data of the isotope 133Cs.


Contents

See also: list of Cesium isotopes.

 

General data

Name of the isotope:Cesium-133; Cs-133Symbol:133Cs or 13355CsMass number A:133 (= number of nucleons)Atomic number Z:55 (= number of protons)Neutrons N:78Isotopic mass:132.90545196(6) u (atomic weight of Cesium-133)Nuclide mass:132.8752821 u (calculated nuclear mass without electrons)Mass excess:-88.07093 MeVMass defect:1.200788248 u (per nucleus)Nuclear binding energy:1118.52704828 MeV (per nucleus)
8.40997781 MeV (average binding energy per nucleon)
Separation energy:SN = 8.9896(10) MeV (first neutron)
SP = 6.08094(1) MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
7/2+Magnetic dipole moment:μ(μN) = +2.5778(14)Charge radius:4.8041(46) femtometer fmYear of discovery:1921

 

Parent Nuclides

Direct parent isotopes are: 133Ba, 133Xe.

 

Occurrence

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

 

Atomic Mass maQuantityHalf-lifeSpin
Cesium
Isotopic mixture
132.90545196 u100 %
Isotope 133Cs132.90545196(6) u100 %stable7/2+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 133Cs

Isotope:133Cs-NMRQuantity:100 %Spin:7/2+Nuclearmagnetic moment
μ/μN:
+2.5778(14)Gyromagnetic ratio γ:3.5339 · 107 rad T-1 s-1Nuclear g-factor:gl = 0.73651428571429Quadrupole moment Q:- 0.00343(10) barn (100 fm2)Resonance frequency:v0 = 5.6234 at 1 TRelative Sensitivity:0.04838 (H0 = const.)
2.7736 (v0 = const.)
[related to 1H = 1.000]

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 78) and isobaric (same nucleon number A = 133) with Cesium-133. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 78Isobar A = 133
43121Tc
44122Ru
45123Rh
46124Pd
47125Ag
48126Cd133Cd
49127In133In
50128Sn133Sn
51129Sb133Sb
52130Te133Te
53131I133I
54132Xe133Xe
55133Cs133Cs
56134Ba133Ba
57135La133La
58136Ce133Ce
59137Pr133Pr
60138Nd133Nd
61139Pm133Pm
62140Sm133Sm
63141Eu133Eu
64142Gd
65143Tb
66144Dy
67145Ho
68146Er
69147Tm
70148Yb
71149Lu

 

External data and identifiers

Adopted Levels, Gammas:NuDat 133Cs

 


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Last update: 2023-05-02


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