Experimental investigation of the radionuclides produced in massive spallation target

The experiments were performed with a spallation target QUINTA, which contains 512 kg of natural uranium in five sections. Threshold activation detectors of cobalt were placed in the whole volume of the target. The detectors were irradiated in the secondary neutron field generated by the 660 MeV proton beam. The first experiment was performed with the lead shielding around the target and the second one was carried out without shielding. The threshold activation detectors were measured and analyzed using the gamma-ray spectroscopy. The experimental results of reaction rates from the first experiment were compared with the second experiment.