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Zoom: drag the cursor along the line.
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Details: double click on a nuclide to generate more detailed data.

Half life colour code, values in seconds.

stable	> 2.9 x 10 ²	> 0.5
> 2 x 10 ³²	> 1.6 x 10 ²	> 2.3 x 10 ^-1
> 3 x 10 ⁷	> 83.4	> 1 x 10 ^-1
> 1.1 x 10 ⁶	> 43	> 4.6 x 10 ^-2
> 1.4 x 10 ⁵	> 23.5	> 1.4 x 10 ^-2
> 3.4 x 10 ⁴	> 12	> 8.2 x 10 ^-4
> 8.6 x 10 ³	> 6.2	> 0
> 3 x 10 ³	> 3.5
> 1.3 x 10 ³	> 1.8
> 6 x 10 ²	> 0.9

Sources of data

1 - ENSDF datasets, as maintained by the International Network of Nuclear Structure and Decay Data Evaluators and the US National Nuclear Data Center, Brookhaven National Laboratory. Snapshot of March 2008.
2 - Jagdish K. Tuli, Nuclear Wallet Cards, 7th edition, April 2005, Brookhaven National Laboratory, US National Nuclear Data Center.
3 - S. F. Mughabghab, Atlas of Neutron Resonances, Elsevier, 2006.

Uncertainties

Uncertainties are shown in italics, and are expressed in terms of the last digit(s) of the recommended value. For example: 686.080 6 means 686.080 ± 0.006, 0.037 3 means 0.037 ± 0.003, and 1.97 +131 -19 means 1.97 +1.31 and -0.19.

Table

Column 1: Nuclide
Nuclide names are of the form Z, Element name, and A(m_i) where m_i denotes an isomeric state.
Nuclides are listed in order of:
1 - increasing atomic number Z,
2 - increasing mass number A,
3 - mass excess Δ (see column 3).

Some nuclides have ill-defined Δ and possess the same values for Z, A and Δ, which prevents any distinction being made between ground and metastable state(s) on the basis of the energies of these levels. Under these circumstances, ground or metastable states cannot be distinguished and these states remain unassigned within the data file (for example, 81-Tl-190 is ill-defined as either J^π = 2(-) or 7(+); and 83-Bi-194m is ill-defined as either J^π = (10-) or J^π = (6+, 7+)).

Column 2: J^π source: NWC
Spin and parity assignments without and with parentheses are based on strong and weak arguments, respectively. See the introductory pages of any issue of Nuclear Data Sheets for descriptions of strong and weak arguments for J^π assignments.

Column 3: Mass excess source: NWC
Mass excesses are given in MeV, with ¹²C mass excess equal to zero by definition. Values for isomers are obtained by adding the excitation energy to the ground state mass excess. Whenever the excitation energy is not known, the mass excess for the next lower isomer is given. An appended “syst” denotes that the value is obtained from systematics. Source: NWC

Column 4: Natural abundance or half-life, or width source: NWC
Abundances are in bold font. An appended “syst” is present when a limit or an approximate value is obtained from systematics. Source: NWC
The adopted half-life units are as follows:

y	year
d	day
min	minute
s	second
ms	10^-3 second
μs	10^-6 second
ns	10^-9 second
ps	10^-12 second

Column 5: Decay modes source: NWC
Decay modes are listed in order of decreasing strength, followed by the percentage branching. An expected but not observed mode of decay is followed by “?”. Source: NWC
Explanation of symbols:

β^-	β^- decay.
ε	ε (electron capture), and/or ε + β⁺, and/or β⁺.
IT	isomeric transition.
n	neutron decay.
p	proton decay.
α	alpha decay.
SF	spontaneous fission.
2β^-, 3α, …	double β^-, decay by means of three α emission, ...
β^-n, β^-p, …	delayed n, p, … emission following β^- decay.
εn, εp, …	delayed n, p, … emission following ε decay.

Column 6: Major Radiation source: ENSDF data processed with RADLIST
The quoted beta radiation energy is the end-point energy.
Selection criteria for the principal radiations:

Beta radiation:	most energetic branch with an intensity greater than 0.5% is listed first, followed in order of decreasing energy by a maximum of two other branches with intensities greater than 20%.
Alpha radiation:	four most intense branches with intensities greater than 0.5% are listed in order of energy.
Gamma radiation:	two most intense branches emitted during the decay of the daughter(s) to their ground state(s) with intensities greater than 0.5% are listed in order of intensity.

Column 7 : Thermal Neutron Cross-section source: Atlas of Neutron Resonances.
Data are expressed in barns.
Notation:

σ_γ	neutron radiative capture measured in a Maxwellian flux.
σ_γ^m , σ_γ^{m + g}	neutron radiative capture measured with reactor neutrons, leading to the formation of ground (g) and metastable (m) states.
σ_f	neutron fission cross section.
σ_p	neutron cross section for proton emission.
σ_a	neutron absorption cross section.
σ_t	neutron total cross section.