It's Elemental - Isotopes of the Element Barium

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Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Isotopes of the Element Barium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

130	0.106%	≥ 3.5×10⁺¹⁴ years

132	0.101%	Stable

134	2.417%	Stable

135	6.592%	Stable

136	7.854%	Stable

137	11.232%	Stable

138	71.698%	Stable

All Known Isotopes of the Element Barium

Mass Number	Half-life	Decay Mode	Branching Percentage

114	0.43 seconds	Electron Capture	~ 100.00

		Electron Capture with delayed Proton Emission	20.00

		Alpha Decay	No Data Available

115	0.45 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	> 15.00

116	1.35 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	3.00

117	1.75 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	> 0.00

		Electron Capture with delayed Alpha Decay	> 0.00

118	5.2 seconds	Electron Capture	100.00

119	5.4 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	< 25.00

120	24 seconds	Electron Capture	100.00

121	29.7 seconds	Electron Capture	100.00

122	1.95 minutes	Electron Capture	100.00

123	2.7 minutes	Electron Capture	100.00

124	11.0 minutes	Electron Capture	100.00

125	3.5 minutes	Electron Capture	100.00

126	100 minutes	Electron Capture	100.00

127	12.7 minutes	Electron Capture	100.00

127_m	1.9 seconds	Isomeric Transition	100.00

128	2.43 days	Electron Capture	100.00

129	2.23 hours	Electron Capture	100.00

129_m	2.16 hours	Electron Capture	<= 100.00

		Isomeric Transition	No Data Available

130	≥ 3.5×10⁺¹⁴ years	Double Electron Capture	No Data Available

130_m	9.4 milliseconds	Isomeric Transition	100.00

131	11.50 days	Electron Capture	100.00

131_m	14.6 minutes	Isomeric Transition	100.00

132	Stable	-	-

133	3848.9 days	Electron Capture	100.00

133_m	38.9 hours	Isomeric Transition	99.99

		Electron Capture	9.6E-3

134	Stable	-	-

135	Stable	-	-

135_m	28.7 hours	Isomeric Transition	100.00

136	Stable	-	-

136_m	0.3084 seconds	Isomeric Transition	100.00

137	Stable	-	-

137_m	2.552 minutes	Isomeric Transition	100.00

138	Stable	-	-

139	83.06 minutes	Beta-minus Decay	100.00

140	12.752 days	Beta-minus Decay	100.00

141	18.27 minutes	Beta-minus Decay	100.00

142	10.6 minutes	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	0.09

143	14.5 seconds	Beta-minus Decay	100.00

144	11.5 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	3.60

145	4.31 seconds	Beta-minus Decay	100.00

146	2.22 seconds	Beta-minus Decay	100.00

147	0.893 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	0.06

148	0.612 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	0.40

149	0.344 seconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	0.43

150	0.3 seconds	Beta-minus Decay	100.00

151	> 150 milliseconds	Beta-minus Decay	No Data Available

152	≈ 0.1 seconds	Beta-minus Decay	No Data Available

153	≈ 0.08 seconds	Beta-minus Decay	No Data Available