Barium-149

Properties and data of the isotope ¹⁴⁹Ba.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Barium isotopes (and general data sources).

General data

Name of the isotope:Barium-149; Ba-149Symbol:¹⁴⁹Ba or 14956BaMass number A:149 (= number of nucleons)Atomic number Z:56 (= number of protons)Neutrons N:93Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.6607142857143 (= neutron-proton ratio)Neutron excess (N-Z):37Isotopic mass:148.94258(21) u (atomic weight of Barium-149)Nuclide mass:148.9118616 u (calculated nuclear mass without electrons)Mass excess:-53.48639 MeVMass defect:1.30145898 u (per nucleus)Nuclear binding energy:1212.30123112 MeV (per nucleus)
8.13624987 MeV (average binding energy per nucleon)Separation energy:S_N = 3.60(44) MeV (first neutron)
S_P = 13.50(44) MeV (first proton)Half-life:344(7) msDecay constant λ:2.0149627341859 s^-1Specific activity α:8.198911765399 × 10⁺²¹ Bq g^-1
221592209875.65 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2-Year of discovery:1993

Radioactive Decay

Half-life T_½ = 344(7) ms respectively 3.44 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴⁹La	< 100 %	7.10(48) MeV
β^-, n	¹⁴⁸La	0.43(12) %	1.52(44) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴⁹Cs.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 93) and isobaric (same nucleon number A = 149) with Barium-149. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 93	Isobar A = 149
54	¹⁴⁷Xe
55	¹⁴⁸Cs	¹⁴⁹Cs
56	¹⁴⁹Ba	¹⁴⁹Ba
57	¹⁵⁰La	¹⁴⁹La
58	¹⁵¹Ce	¹⁴⁹Ce
59	¹⁵²Pr	¹⁴⁹Pr
60	¹⁵³Nd	¹⁴⁹Nd
61	¹⁵⁴Pm	¹⁴⁹Pm
62	¹⁵⁵Sm	¹⁴⁹Sm
63	¹⁵⁶Eu	¹⁴⁹Eu
64	¹⁵⁷Gd	¹⁴⁹Gd
65	¹⁵⁸Tb	¹⁴⁹Tb
66	¹⁵⁹Dy	¹⁴⁹Dy
67	¹⁶⁰Ho	¹⁴⁹Ho
68	¹⁶¹Er	¹⁴⁹Er
69	¹⁶²Tm	¹⁴⁹Tm
70	¹⁶³Yb	¹⁴⁹Yb
71	¹⁶⁴Lu	¹⁴⁹Lu
72	¹⁶⁵Hf
73	¹⁶⁶Ta
74	¹⁶⁷W
75	¹⁶⁸Re
76	¹⁶⁹Os
77	¹⁷⁰Ir
78	¹⁷¹Pt
79	¹⁷²Au
80	¹⁷³Hg