Periodic Table/Lanthanum/¹⁵⁵La

← 154La156La →

¹⁵⁵La

Lanthanum-155

Radioactive· Half-life: 101 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

57

Neutrons (N)

98

Mass Number (A)

155

Atomic Mass

154.959280AMU

Spin / Parity

1/2+

Binding E/A

7.840keV

Natural Abundance

Trace / None

Half-life

101 ms

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

β⁻

100.0%

β⁻n

2n

Decay Chain

¹⁵⁵LaLanthanum101 ms

β⁻100.0%

β⁻n¹⁵⁴Ce

2n¹⁵³La

¹⁵⁵CeCerium313 ms

β⁻100.0%

β⁻n¹⁵⁴Pr

¹⁵⁵PrPraseodymium1.47 s

β⁻100.0%

β⁻n¹⁵⁴Nd

¹⁵⁵NdNeodymium8.90 s

β⁻100.0%

¹⁵⁵PmPromethium41.5 s

β⁻100.0%

¹⁵⁵SmSamarium22.2 min

β⁻100.0%

¹⁵⁵EuEuropium4.74 y

β⁻100.0%

¹⁵⁵GdGadoliniumSTABLE

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

Other Isotopes of Lanthanum

116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157

← Back to LanthanumData: IAEA NDS · ENSDF