Excitation functions of proton induced reactions on natOs up to 65 MeV: Experiments and comparison with results from theoretical codes

Activation of thin Os-nat targets, electrodeposited on Ni backings, was investigated for the first time in stacked foil irradiations with 65 MeV and 34 MeV proton beams. Assessments of the produced radionuclides by high resolution gamma-ray spectroscopy yielded excitation functions for formation of (184,) (185,) (186m,m+g,) (187m+g,) (188m+g, 189m2+m1+g, 190m2,m1+g,) Ir192m1+g and (185cum,) Os191m+g, Re183m+g. Where available comparisons with the reaction cross sections obtained in 2 earlier studies on enriched Os-192 were made. Reduced uncertainty on cross sections is obtained by simultaneous remeasurement of the Al-27(p,x)Na-22,Na-24, Ni-nat(p,x)Ni-57 and Ti-nat(p,x)V-48 monitor reactions over wide relevant energy ranges. Confirmation of monitoring took place by assessment of excitation functions of Cu-61, Ni-56, Co-55,Co-56,Co-57,Co-58 and Mn-52 induced in the Ni backings and comparison with a recent compilation for most of these radionuclides. Contributing reactions and overall cross sections are discussed and were evaluated in comparison with the results of the theoretical code TALYS 1.6 (values from the on-line library TENDL-2013). (C) 2014 Elsevier B.V. All rights reserved.