Periodic Table/Samarium/¹³⁹Sm

← 138Sm140Sm →

¹³⁹Sm

Samarium-139

Radioactive· Half-life: 2.57 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

62

Neutrons (N)

77

Mass Number (A)

139

Atomic Mass

138.922297AMU

Spin / Parity

1/2+

Binding E/A

8.015keV

Natural Abundance

Trace / None

Half-life

2.57 min

Decay Modesoverview · half-life · α · β⁻ · β⁺

β⁺

100.0%

Decay Chain

¹³⁹SmSamarium2.57 min

β⁺100.0%

¹³⁹PmPromethium4.15 min

β⁺100.0%

¹³⁹NdNeodymium29.7 min

β⁺100.0%

¹³⁹PrPraseodymium4.41 h

β⁺100.0%

¹³⁹CeCerium138 d

EC100.0%

¹³⁹LaLanthanumSTABLE

6-step decay chain → stable · Primary path shown

Other Isotopes of Samarium

128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168

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