Below is a list of relevant web pages.
The Nuclear Data Sheets are an authoritative and comprehensive data source on nuclei. The corresponding
Nuclear Data Sheets policies
have been used repeatedly in this book to decide what conventions to take as standard.
Authoritative values of physical constants from NIST.
Extensive information about nuclei provided by the National Nuclear Data Center.
The calculator on this site gives exact values for the Wigner 3j, 6j, and 6j symbols. The 3j symbols are readily converted to Clebsch-Gordan coefficients, {N.13}.
Extensive data on light nuclei from
Probably this book’s primary source of information on about every loose end, though somewhat uneven. Some great, some confusing, some overly technical.