Nuclear Properties for Astrophysics

Interactive access to nuclear properties of interest for astrophysics for almost 9000 nuclei. Get your experimental masses and calculated masses, deformations, decay Q-values, half-lives, spins, and separation energies here! Access to potential-energy contour maps versus ε2 and γ shape degrees of freedom is also provided.

Plot of R-Process Abundances

The magenta line shows a typical r-process path, and the small magenta squares are the nuclei produced when the nuclides along the path decay back to stability after the supernova neutron flux ends. The insert shows the solar r-process abundances as a function of nucleon number A The A axis of the insert curves so that a line from a β-stable nucleus (black square at the upper edge of the chart plot), which is perpendicular to the line of β-stability in the chart, will intersect the A axis at the value corresponding to the A value of the black square of the β-stable nucleus where the (imaginary) line originates. An extension of the line upward will intersect with the appropriate data point. In the reverse, a line through, for example the upper and lower A=120 tic mark continuing towards the chart plot will intersect the black square (β-stable nucleus) with A=120.

Access to the data:

The 2012 masses and deformations are from
Nuclear Ground-State Masses and Deformations FRDM(2012), by P. Möller, A. J. Sierk, T. Ichikawa, and H. Sagawa,
Atomic Data Nucl. Data Tables 109-110 (2016), 1-204.

The older calculated masses and deformations are from
Nuclear Ground-State Masses and Deformations, by P. Möller, J. R. Nix, W. D. Myers, and W. J. Swiatecki
Atomic Data Nucl. Data Tables 59 (1995), 185-381.

The other calculated nuclear properties are from
Nuclear Properties for Astrophysical and Radioactive-Ion-Beam Applications,
by P. Möller, J. R. Nix, and K.-L. Kratz,
Atomic Data Nucl. Data Tables 66 (1997), 131-343.

The reference to the calculated ground-state potential-energy surfaces is
P. Möller, A. J. Sierk, R. Bengtsson, H. Sagawa, T. Ichikawa
Atomic Data and Nuclear Data Tables 98 (2012) 149-300.
This publication presents potential-energy surfaces of most even-even nuclei, here we provide access to stand-alone potential-energy surfaces of all 7206 nuclides we calculated. In addition the surfaces here are in color. A preprint of the ADNDT publication with associated figures and tables is available on our web site. But for the complete publication we recommend the published version available on the ADNDT web site.

The reference to the fission potential-energy surfaces calculated in three dimensions (ε24,γ) posted on this web site, simplified to 2D contour diagrams versus ε2 and γ, is
P. Möller, A. J. Sierk, T. Ichikawa, A. Iwamoto,R. Bengtsson, H. Uhrenholt, and S. Åberg,
Physical Review C 79 (2009) 064304. Please note that a more complete characterization of the fission barriers also requires calculations in 5 dimensions in the three-quadratic-surface parameterization for several million different nuclear shapes. Such calculations are also carried out in the above reference, but the complexity of such surfaces prevents them to be simplified to two-dimensional contour drawings.

The mass evaluation we used in adjusting the FRDM2012 is AME2003 (A. H. Wapstra, G. Audi, and C. Thibault, Nucl. Phys. A729 (2003), 129).

A more recent experimental mass evaluation is
by Wang et al (M. Wang, G. Audi, A. H. Wapstra, F. G. Kondev, M. MacCormick, X. Xu, and B. Pfeiffer, Chin. Phys. C 36 (2012) 1603) which we use here. Another repository of this evaluation and related data can be found here .

An exhaustive list of nuclear-mass data bases and other mass-related resources is found here .

Page by Robert MacFarlane and Peter Möller,
created 4 March 1997, last modified 25 June 2012