Barium-146

Properties and data of the isotope ¹⁴⁶Ba.

Contents

General data

Name of the isotope:Barium-146; Ba-146Symbol:¹⁴⁶Ba or 14656BaMass number A:146 (= number of nucleons)Atomic number Z:56 (= number of protons)Neutrons N:90Isotopic mass:145.930276(22) u (atomic weight of Barium-146)Nuclide mass:145.8995576 u (calculated nuclear mass without electrons)Mass excess:-64.94749 MeVMass defect:1.287768232 u (per nucleus)Nuclear binding energy:1199.5483815 MeV (per nucleus)
8.2160848 MeV (average binding energy per nucleon)Separation energy:S_N = 5.502(23) MeV (first neutron)
S_P = 12.182(23) MeV (first proton)Half-life:2.21(6) sDecay constant λ:0.31364125817192 s^-1Specific activity α:1.302615059447 × 10⁺²¹ Bq g^-1
35205812417.505 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.9479(138) femtometer fmYear of discovery:1970

Radioactive Decay

Half-life T_½ = 2.21(6) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴⁶La	100 %	4.10 MeV

Parent Nuclides

Direct parent isotope is: ¹⁴⁶Cs.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 90) and isobaric (same nucleon number A = 146) with Barium-146. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 90	Isobar A = 146
51	¹⁴¹Sb
52	¹⁴²Te
53	¹⁴³I
54	¹⁴⁴Xe	¹⁴⁶Xe
55	¹⁴⁵Cs	¹⁴⁶Cs
56	¹⁴⁶Ba	¹⁴⁶Ba
57	¹⁴⁷La	¹⁴⁶La
58	¹⁴⁸Ce	¹⁴⁶Ce
59	¹⁴⁹Pr	¹⁴⁶Pr
60	¹⁵⁰Nd	¹⁴⁶Nd
61	¹⁵¹Pm	¹⁴⁶Pm
62	¹⁵²Sm	¹⁴⁶Sm
63	¹⁵³Eu	¹⁴⁶Eu
64	¹⁵⁴Gd	¹⁴⁶Gd
65	¹⁵⁵Tb	¹⁴⁶Tb
66	¹⁵⁶Dy	¹⁴⁶Dy
67	¹⁵⁷Ho	¹⁴⁶Ho
68	¹⁵⁸Er	¹⁴⁶Er
69	¹⁵⁹Tm	¹⁴⁶Tm
70	¹⁶⁰Yb
71	¹⁶¹Lu
72	¹⁶²Hf
73	¹⁶³Ta
74	¹⁶⁴W
75	¹⁶⁵Re
76	¹⁶⁶Os
77	¹⁶⁷Ir
78	¹⁶⁸Pt