Systematics on neutron-induced isomeric cross-section ratios at 14.5 MeV

The status of knowledge on branching ratios of isomeric and ground-state cross-sections at 14 to 15 MeV is reviewed. Earlier systematics for the isomer ratios of the (n,n'), (n,p), (n,t), (n,alpha) and (n,2n) reactions are examined and new systematics for these reactions are presented. A comparison with model calculations is discussed. The (n,2n) isomer ratios show a behavior different from that of the studied one-step reactions. A table with experimental information on (n,2n) cross-section data at 14 to 15 MeV is included.