Berkeley Lab


      The Isotopes Project Home Page

  Member of the U.S. Nuclear Data Program USNDN

The Isotopes Project compiles, evaluates, and disseminates nuclear structure, radioactive decay, and neutron capture gamma-ray data for basic and applied research. The Project evaluates isotopic data for publication in Nuclear Data Sheets (Academic Press). The group also leads evaluation efforts on prompt and delayed neutron activation data for the International Atomic Energy Agency (IAEA), Nuclear Data Section, performs neutron cross section measurements at the Institute of Isotope and Surface Chemistry (Budapest), and collaborates with the Lawrence Livermore National Laboratory in the evaluation of neutron capture data gamma-ray data for the Evaluated Nuclear Data File (ENDF).

The Isotopes Project disseminates nuclear structure and radioactive decay data and references on-line at the Isotopes Project's Website.

We may shut down the many of the Isotopes Project's web services by 2013 due to insufficient resources to maintnain them. We are striving to find a way to continue these services in the future.

The Isotopes Project has also has published the following printed publications.

Database of Prompt Gamma Rays from Slow Neutron Capture for Elemental Analysis, IAEA STI/PUB/1263, 251 pp (2007).
The 8th edition of the Table of Isotopes, John Wiley & Sons, Inc., (1996, 1998 1999). The CD-ROM version of the 8th edition of the Table of Isotopes (Wiley-VCH, 1999) is now freely available on-line by clicking here
Table of Radioactive Isotopes, John Wiley & Sons, Inc.(1986), no longer in print but available used from various on-line booksellers. The database for TORI is available on the here and an Internet version is on-line here.
Table of Superdeformed Nuclear Bands and Fission Isomers Nuclear Data Sheets 97,241 (2002) and on the Table of Isotopes CD-ROMs, and on the Internet.

The Isotopes Project performs research using Prompt Neutron Activation Analysis (PGAA), Neutron Activation Analysis (NAA), X-ray Fluorescence using a Scanning Electron Microscope (XRF/SEM), and Inductively Couple Plasma Mass Spectroscopy (ICP-MS) and other nuclear analytical techniques to study recent extraterrestrial impact events. This research has led to the discovery of the Younger Dryas Impact event 12,900 years ago over North America that likely led to the extinction of North American megafuana and the onset of Younger Dryas Cooling. This research was published in Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling, Proceedings of the National Academy of Science 104, 16016-16021 (2007). This research has led to the discovery of another impact 35,000 years ago in Beringia that embedded micrometeorites in mammoth tusks and led to the local extinction of megafauna. The group continues to work with a worldwide collaboration of researchers interested in the global affects of recent impact events and supernovae on Earth's environment.

Isotopes Project group members:

R.B. Firestone Group Leader
Shamsuzzoha Basunia
C.M. Baglin
A. Hurst
E. Browne (Guest Scientist)
H. Choi (Guest Scientist)

If you have technical questions and comments, please contact Richard B. Firestone, preferably via e-mail.

Last updated March 15, 2010