Cesium-133

Properties and data of the isotope ¹³³Cs.

Content

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:S_N = 8.9896(10) MeV (first neutron)
S_P = 6.08094(1) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)7/2+Magnetic dipole moment:μ(μ_N) = +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 m_a	Quantity	Half-life	Spin
Cesium Isotopic mixture	132.90545196 u	100 %
Isotope ¹³³Cs	132.90545196(6) u	100 %	stable	7/2+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ¹³³Cs

Isotope:¹³³Cs-NMRQuantity:100 %Spin:7/2+Nuclearmagnetic moment
μ/μ_N:+2.5778(14)Gyromagnetic ratio γ:3.5339 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = 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.

OZ	Isotone N = 78	Isobar A = 133
43	¹²¹Tc
44	¹²²Ru
45	¹²³Rh
46	¹²⁴Pd
47	¹²⁵Ag
48	¹²⁶Cd	¹³³Cd
49	¹²⁷In	¹³³In
50	¹²⁸Sn	¹³³Sn
51	¹²⁹Sb	¹³³Sb
52	¹³⁰Te	¹³³Te
53	¹³¹I	¹³³I
54	¹³²Xe	¹³³Xe
55	¹³³Cs	¹³³Cs
56	¹³⁴Ba	¹³³Ba
57	¹³⁵La	¹³³La
58	¹³⁶Ce	¹³³Ce
59	¹³⁷Pr	¹³³Pr
60	¹³⁸Nd	¹³³Nd
61	¹³⁹Pm	¹³³Pm
62	¹⁴⁰Sm	¹³³Sm
63	¹⁴¹Eu	¹³³Eu
64	¹⁴²Gd
65	¹⁴³Tb
66	¹⁴⁴Dy
67	¹⁴⁵Ho
68	¹⁴⁶Er
69	¹⁴⁷Tm
70	¹⁴⁸Yb
71	¹⁴⁹Lu