Xenon-146

Properties and data of the isotope ¹⁴⁶Xe.

Content

General data

Name of the isotope:Xenon-146; Xe-146Symbol:¹⁴⁶Xe or 14654XeMass number A:146 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:92Isotopic mass:145.948518(26) u (atomic weight of Xenon-146)Nuclide mass:145.9188966 u (calculated nuclear mass without electrons)Mass excess:-47.95517 MeVMass defect:1.271206 u (per nucleus)Nuclear binding energy:1184.12076176 MeV (per nucleus)
8.11041618 MeV (average binding energy per nucleon)Separation energy:S_N = 4.533(27) MeV (first neutron)
S_P = 14.3(5) MeV (first proton)Half-life:146(6) msDecay constant λ:4.7475834284928 s^-1Specific activity α:1.971766631081 × 10⁺²² Bq g^-1
532909900292.35 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.9315(245) femtometer fmYear of discovery:1989

Radioactive Decay

Half-life T_½ = 146(6) ms respectively 1.46 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴⁶Cs	100 %	7.355(24) MeV
β^-, n	¹⁴⁵Cs	6.9(15) %	4.028(26) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 92) and isobaric (same nucleon number A = 146) with Xenon-146. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 92	Isobar A = 146
53	¹⁴⁵I
54	¹⁴⁶Xe	¹⁴⁶Xe
55	¹⁴⁷Cs	¹⁴⁶Cs
56	¹⁴⁸Ba	¹⁴⁶Ba
57	¹⁴⁹La	¹⁴⁶La
58	¹⁵⁰Ce	¹⁴⁶Ce
59	¹⁵¹Pr	¹⁴⁶Pr
60	¹⁵²Nd	¹⁴⁶Nd
61	¹⁵³Pm	¹⁴⁶Pm
62	¹⁵⁴Sm	¹⁴⁶Sm
63	¹⁵⁵Eu	¹⁴⁶Eu
64	¹⁵⁶Gd	¹⁴⁶Gd
65	¹⁵⁷Tb	¹⁴⁶Tb
66	¹⁵⁸Dy	¹⁴⁶Dy
67	¹⁵⁹Ho	¹⁴⁶Ho
68	¹⁶⁰Er	¹⁴⁶Er
69	¹⁶¹Tm	¹⁴⁶Tm
70	¹⁶²Yb
71	¹⁶³Lu
72	¹⁶⁴Hf
73	¹⁶⁵Ta
74	¹⁶⁶W
75	¹⁶⁷Re
76	¹⁶⁸Os
77	¹⁶⁹Ir
78	¹⁷⁰Pt
79	¹⁷¹Au
80	¹⁷²Hg