Periodic Table/Neptunium/²³¹Np

← 230Np232Np →

²³¹Np

Neptunium-231

Radioactive· Half-life: 48.8 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

93

Neutrons (N)

138

Mass Number (A)

231

Atomic Mass

231.038244AMU

Spin / Parity

5/2+

Binding E/A

7.396keV

Natural Abundance

Trace / None

Half-life

48.8 min

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

β⁺

98.0%

α

2.0%

Decay Chain

²³¹NpNeptunium48.8 min

β⁺98.0%

α²²⁷Pa2.00%

²³¹UUranium4.20 d

EC100.0%

α²²⁷Th0.00%

²³¹PaProtactinium32.6 ky

α100.0%

24Ne²⁰⁷Tl13.4%

23F²⁰⁸Pb9.90%

²²⁷AcActinium21.8 y

β⁻98.6%

α²²³Fr1.38%

²²⁷ThThorium18.7 d

α100.0%

²²³RaRadium11.4 d

α100.0%

¹⁴C²⁰⁹Pb8.90%

²¹⁹RnRadon3.96 s

α100.0%

²¹⁵PoPolonium1.78 ms

α100.0%

β⁻²¹⁵At2.30%

²¹¹PbLead36.2 min

β⁻100.0%

²¹¹BiBismuth2.14 min

α100.0%

β⁻²¹¹Po0.28%

²⁰⁷TlThallium4.77 min

β⁻100.0%

²⁰⁷PbLeadSTABLE

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

Other Isotopes of Neptunium

219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245

← Back to NeptuniumData: IAEA NDS · ENSDF