data japanDownload Japan Prefectures Shapefile Data. Japan is divided into 47 prefectures, which rank immediately below the national government and form the country’s first level of jurisdictionFission yield data from JENDL-4.0 Fission Yield Data were added for fission products in Tables of Nuclear Data. (February 8, 2011) The 2010 edition of WWW Chart of Nuclides and Tables of