High-energy threshold reaction rates on 0.8 GeV proton-irradiated thick Pb-targetYu.E. Titarenko1, V.F. Batyaev1, A.Yu. Titarenko1, M.A. Butko1, K.V. Pavlov1, R.S. Tikhonov1, S.N. Florya1, S.G. Mashnik2 and W. Gudowski3
1 Institute for Theoretical and Experimental Physics (ITEP), 117218 Moscow, Russia
2 Los Alamos National Laboratory, Los Alamos, NM 87545, USA
3 Royal Institute of Technology, 106 91 Stockholm, Sweden
Published online: 21 May 2008
This works presents results of activation-aided determination of threshold reaction rates in 92 209Bi, natPb, 197Au, 181Ta, 169Tm, natIn, 93Nb, 64Zn, 65Cu, 63Cu, 59Co, 19F, and 12C samples and in 121 27Al samples. All the samples are aligned with the proton beam axis inside and outside the demountable 92-cm thick Pb target of 15-cm diameter assembled of 23 4-cm thick discs. The samples are placed on 12 target disks to reproduce the long axis distribution of protons and neutrons. In June 2006, the target was exposed for 18 hours to a 800-MeV proton beam extracted from the ITEP U-10 accelerator. The proton fluence and the proton beam shape were determined using the 27Al(p,x)7Be monitor reaction. The total number of protons onto the target was (6.0±0.5)×1015. The reaction rates were determined by the direct gamma-spectrometry techniques. The GC-2518 detectors of 1.8 keV resolution and the DGDK-60V detectors of 2.9 keV resolution at the 1332 keV gamma-line were used to take the measurements. In total, 1196 gamma-spectra have been measured, and about 1500 reaction rates determined. The measured reaction rates were simulated by the MCNPX code using the following databases: ENDF/B6 for neutrons below 20 MeV, MENDL2 for 20-100 MeV neutrons, and MENDL2P for proton cross sections up to 200 MeV. An acceptable agreement of simulations with experimental data has been found.
© CEA 2008