Periodic Table/Cesium/¹⁴⁹Cs

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¹⁴⁹Cs

Cesium-149

Radioactive· Half-life: 112 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

55

Neutrons (N)

94

Mass Number (A)

149

Atomic Mass

148.953516AMU

Spin / Parity

3/2+

Binding E/A

7.885keV

Natural Abundance

Trace / None

Half-life

112 ms

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

β⁻

100.0%

β⁻n

25.0%

2n

Decay Chain

¹⁴⁹CsCesium112 ms

β⁻100.0%

β⁻n¹⁴⁸Ba25.0%

2n¹⁴⁷Cs

¹⁴⁹BaBarium349 ms

β⁻100.0%

β⁻n¹⁴⁸La3.90%

¹⁴⁹LaLanthanum1.07 s

β⁻100.0%

β⁻n¹⁴⁸Ce1.43%

¹⁴⁹CeCerium4.94 s

β⁻100.0%

¹⁴⁹PrPraseodymium2.26 min

β⁻100.0%

¹⁴⁹NdNeodymium1.73 h

β⁻100.0%

¹⁴⁹PmPromethium2.21 d

β⁻100.0%

¹⁴⁹SmSamariumSTABLE

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

Other Isotopes of Cesium

111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152

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