Periodic Table/Samarium/¹²⁸Sm

129Sm →

¹²⁸Sm

Samarium-128

Radioactive

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

62

Neutrons (N)

66

Mass Number (A)

128

Atomic Mass

127.957971AMU

Spin / Parity

0+

Binding E/A

7.751keV

Natural Abundance

Trace / None

Half-life

Unknown

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

β⁺

β⁺p

Decay Chain

¹²⁸SmSamarium?

β⁺

β⁺p¹²⁷Nd

¹²⁸PmPromethium1.00 s

β⁺100.0%

β⁺p¹²⁷Pr

p¹²⁷Nd0.00%

¹²⁸NdNeodymium?

β⁺

¹²⁸PrPraseodymium2.85 s

β⁺100.0%

β⁺p¹²⁷La

¹²⁸CeCerium3.93 min

β⁺100.0%

¹²⁸LaLanthanum5.18 min

β⁺100.0%

¹²⁸BaBarium2.43 d

EC100.0%

¹²⁸CsCesium3.64 min

β⁺100.0%

¹²⁸XeXenonSTABLE

9-step decay chain → stable · Primary path shown · branching ratios indicated

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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