Cesium-150

Properties and data of the isotope ¹⁵⁰Cs.

Content

General data

Name of the isotope:Cesium-150; Cs-150Symbol:¹⁵⁰Cs or 15055CsMass number A:150 (= number of nucleons)Atomic number Z:55 (= number of protons)Neutrons N:95Isotopic mass:149.95902(43) u (atomic weight of Cesium-150)Nuclide mass:149.9288501 u (calculated nuclear mass without electrons)Mass excess:-38.17262 MeVMass defect:1.29452378 u (per nucleus)Nuclear binding energy:1205.84113393 MeV (per nucleus)
8.03894089 MeV (average binding energy per nucleon)Separation energy:S_N = 2.99(56) MeV (first neutron)Half-life:84(8) msDecay constant λ:8.2517521495232 s^-1Specific activity α:3.335115019175 × 10⁺²² Bq g^-1
901382437615 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1979

Radioactive Decay

Half-life T_½ = 84(8) ms respectively 8.4 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁵⁰Ba	80 %	11.73(50) MeV
β^-, n	¹⁴⁹Ba	20(10)	6.88(59) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 95) and isobaric (same nucleon number A = 150) with Cesium-150. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 95	Isobar A = 150
55	¹⁵⁰Cs	¹⁵⁰Cs
56	¹⁵¹Ba	¹⁵⁰Ba
57	¹⁵²La	¹⁵⁰La
58	¹⁵³Ce	¹⁵⁰Ce
59	¹⁵⁴Pr	¹⁵⁰Pr
60	¹⁵⁵Nd	¹⁵⁰Nd
61	¹⁵⁶Pm	¹⁵⁰Pm
62	¹⁵⁷Sm	¹⁵⁰Sm
63	¹⁵⁸Eu	¹⁵⁰Eu
64	¹⁵⁹Gd	¹⁵⁰Gd
65	¹⁶⁰Tb	¹⁵⁰Tb
66	¹⁶¹Dy	¹⁵⁰Dy
67	¹⁶²Ho	¹⁵⁰Ho
68	¹⁶³Er	¹⁵⁰Er
69	¹⁶⁴Tm	¹⁵⁰Tm
70	¹⁶⁵Yb	¹⁵⁰Yb
71	¹⁶⁶Lu	¹⁵⁰Lu
72	¹⁶⁷Hf
73	¹⁶⁸Ta
74	¹⁶⁹W
75	¹⁷⁰Re
76	¹⁷¹Os
77	¹⁷²Ir
78	¹⁷³Pt
79	¹⁷⁴Au
80	¹⁷⁵Hg
81	¹⁷⁶Tl