#' A dataset containing Z, A (isotope list) data
#'
#' This is an export of the isotope list of JEFF-3.3. It contains Z,A pairs and mat numbers
#' for 562 Isotopes.
#'
#' @format A data frame with 562 observations of 5 features:
#' \describe{
#' \item{MAT}{MAT number in ENDF-6 format}
#' \item{Z}{Number of protons}
#' \item{X}{Isotope symbol}
#' \item{A}{Atomic mass}
#' \item{M}{Isomer state}
#' }
"mats"
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