Integral cross section measurements in the reference field NISUS

The reference neutron field NISUS at ULRC is one of a family of similar fields including also Mol-ΣΣ and ITN-ΣΣ generated by spherical natural uranium shells situated in reactor thermal columns. Reaction rates measured in NISUS were reported at a previous IAEA meeting two years ago. New measurements have been made since then with the objectives of comparing new techniques with results previously obtained, of providing data for reactions not previously studied and of confirming or improving previous data. Some of the measurements reported here were done as the starting point for a series of spherical shell transmission measurements to be done in the NISUS field