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Updated: 21 December
- Index of
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.
2 - Laboratoire National Henri
Becquerel, Decay Data Evaluation Project (DDEP).
3 - Jagdish K. Tuli,
Nuclear Wallet Cards, 7th edition, April 2005, Brookhaven National Laboratory,
US National Nuclear Data Center.
4 - S. F. Mughabghab, Atlas of Neutron
Resonances, Elsevier, 2006.
5 - RADLIST program, Thomas W. Borrows, 1988,
Brookhaven National Laboratory, US National Nuclear Data Center.
Assembled by Alan Nichols and Marco Verpelli, Nuclear Data Section,
Division of Physical and Chemical Sciences, Department of Nuclear Sciences and
Applications, International Atomic Energy Agency, Vienna, Austria.
Compiled and checked, September to December 2007. Introduction of DDEP
half-lives in October 2008.
Nuclide selection criteria
The table contains all nuclides present within ENSDF, DDEP (LNHB Web
site) and the Nuclear Wallet Cards for which a half-life or natural abundance
is reported. Nuclides for which only the level width is known are not
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.
Column 1: Nuclide
Nuclide names are of the form
Z, Element name, and A(mi) where
mi denotes an isomeric state.
Nuclides are listed in
1 - increasing atomic number Z,
2 - increasing mass number
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
Jπ = 2(-) or 7(+); and 83-Bi-194m is ill-defined as either
Jπ = (10-) or Jπ = (6+, 7+)).
Column 2: Jπ
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 Jπ
Column 3: Mass excess
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.
Column 4: Natural abundance or half-life
are in bold font. DDEP data have precedence on ENSDF data. An appended
syst is present when a limit or an approximate value is
obtained from systematics.
The adopted half-life units are as follows:
year (1 year = 31 556 926 seconds)
Column 5: Decay modes
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 ?.
ε (electron capture), and/or ε +
β+, and/or β+.
double β-, decay by means of three α
delayed n, p,
emission following β- decay.
delayed n, p,
emission following ε decay.
Column 6: Major Radiations
The quoted beta radiation energy is the end-point energy obtained by
processing ENSDF datasets with RADLIST.
Selection criteria for the
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 %.
four most intense branches with intensities greater than 0.5 % are
listed in order of energy.
two most intense branches with intensities greater than 0.5 % are
listed in order of intensity.
Column 7 : Thermal Neutron Cross-section
Data are expressed in barns, and are taken from the Atlas of Neutron
neutron radiative capture measured in a Maxwellian flux.
, σγm + g
neutron radiative capture measured with reactor neutrons, leading
to the formation of ground (g) and metastable (m) states.
neutron fission cross section.
neutron cross section for proton emission.
neutron absorption cross section.
neutron total cross section.
The Kaye and Laby Table of Nuclides in the 16th edition of
the book was over 100 pages long. So as you can imagine it was a very large
table. To minimise browser related problems with such a large page, we have
split the table into parts. Please use the links below to view parts of the
- Part 00 - (Atomic number 000 to
009) Includes Elements: n,
- Part 01 - (Atomic number 010 to
019) Includes Elements: Ne,
- Part 02 - (Atomic number 020 to
029) Includes Elements: Ca,
- Part 03 - (Atomic number 030 to
039) Includes Elements: Zn,
- Part 04 - (Atomic number 040 to
049) Includes Elements: Zr,
- Part 05 - (Atomic number 050 to
059) Includes Elements: Sn,
- Part 06 - (Atomic number 060 to
069) Includes Elements: Nd,
- Part 07 - (Atomic number 070 to
079) Includes Elements: Yb,
- Part 08 - (Atomic number 080 to
089) Includes Elements: Hg,
- Part 09 - (Atomic number 090 to
099) Includes Elements: Th,
- Part 10 - (Atomic number 100 to
118) Includes Elements: Fm,