Isotope: Einsteinium-250
General data
| Element name | Einsteinium |
|---|---|
| Chemical symbol | Es |
| Atomic number Z | 99 |
| Isotope name (symbol) | Einsteinium-250 (Es-250) |
| Neutron number N | 151 |
| Mass number A=Z+N | 250 |
Ground state
| Half-life | 8.5 ± 0.1 h |
|---|---|
| Spin / Parity | (6+) |
| Mass excess | 73230 ± 100 keV (S) |
Decay branches
EC/β⁺ 97% α 3%Isomers
| Isomer | Energy | Half-life | Spin / Parity | Decay branches |
|---|---|---|---|---|
| Isomer 1 | - | 2.21 ± 0.05 h | (1-) | EC/β⁺ ≈ 100% α |
Produced by decay of
NNDC data contain no decay that leads to this isotope.
Many isotopes are also produced, often mainly, in nuclear reactions (e.g. Co-60 from Co-59 by neutron capture, C-14 from nitrogen-14 in the atmosphere) and in fission (e.g. Cs-137, I-131) - those routes are not listed here.
Radioactive decay series
- Einsteinium-250 8.5 h
- Californium-250 13.08 a · 97.0%
- Berkelium-246 1.80 d · 3.0%
- Curium-246 4760 a
- Plutonium-242 3.750×10⁵ a
- Uranium-238 4.463×10⁹ a
- Thorium-234 24.107 d
- Protactinium-234m 1.159 min
- Protactinium-234 6.671 h · 0.16%
- Uranium-234 2.455×10⁵ a
- Thorium-230 75400 a
- Radium-226 1600 a
- Radon-222 3.82146 d
- Polonium-218 3.097 min
- Lead-214 27.06 min
- Astatine-218 1.28 s · 0.022%
- Bismuth-214 19.71 min
- Thallium-210 1.30 min · 0.021%
- Polonium-214 163.48 μs
- Lead-210 22.20 a
- Bismuth-210 5.012 d
- Polonium-210 138.378 d
- Lead-206 stable
Rare branches (below 0.01%)
Rare branches are transformations that occur in fewer than 0.01% of decays, e.g. double beta decay or cluster emission. The nuclides they produce are practically absent from a sample, so they are hidden by default to keep the main path clear. In this series: branches - 8, nuclides - 12.
- Plutonium-238 87.7 a · 2.2×10⁻¹⁰%
- Radon-218 33.75 ms · 1.1×10⁻⁵%
- Mercury-206 8.32 min · 1.9×10⁻⁶%
- Thallium-206 4.202 min · 1.3×10⁻⁴%
- Lead-209 3.235 h · 1.5×10⁻⁶%
- Bismuth-209 2.01×10¹⁹ a · 1.5×10⁻⁶%
- Thallium-205 stable · 1.5×10⁻⁶%
- Lead-212 10.628 h · 2.6×10⁻⁹%
- Bismuth-212 60.55 min · 2.6×10⁻⁹%
- Polonium-212 295.0 ns · 1.7×10⁻⁹%
- Thallium-208 3.053 min · 9.3×10⁻¹⁰%
- Lead-208 stable · 2.6×10⁻⁹%
Decay notation
| Notation | Name | On the chart | Description |
|---|---|---|---|
| α | alpha decay | Alpha decay is the emission of a helium nucleus (2 protons + 2 neutrons): Z−2, A−4. | |
| β⁻, 2β⁻ | beta-minus decay | In beta-minus decay a neutron turns into a proton and the nucleus emits an electron: Z+1, A unchanged. 2β⁻ is double beta decay. | |
| EC, EC/β⁺ | electron capture / beta-plus decay | A proton turns into a neutron: the nucleus captures a shell electron (EC) or emits a positron (β⁺): Z−1, A unchanged. | |
| p, 2p, 3p | proton emission | Proton emission is the ejection of a proton from the nucleus: Z−1, A−1. 2p, 3p - two, three protons. | |
| n, 2n…4n | neutron emission | Neutron emission is the ejection of a neutron from the nucleus: A−1, Z unchanged. 2n…4n - several neutrons. | |
| ¹⁴C, ²⁴Ne… | cluster emission | Cluster emission is the ejection of a light nucleus, e.g. ¹⁴C, ²⁰O, ²⁴Ne, ²⁸Mg, ³⁴Si. It is a very rare transformation. | |
| IT | isomeric transition | An isomeric transition takes a nucleus from an excited state (an isomer, e.g. Pa-234m) to the ground state, usually emitting a γ photon: Z and A unchanged. | |
| β⁻n, ECp, ECα… | delayed emission | Delayed emission is the emission of a particle (n, p or α) right after β⁻ decay or electron capture. The arrow has the colour of the emitted particle and its label shows the transformation, e.g. “β⁻n 63%”. | |
| SF | spontaneous fission | no arrow | Spontaneous fission is the splitting of a nucleus into two fragments of random masses. There is no single daughter, so the chart shows no arrow - it is listed in the decay branches and in the tile tooltip. |
Data sources
- NNDC Wallet Cards 2023 - Data as of 15 October 2024 - licence: Public domain