Stopping powers of havar for protons from 0.45 to 3.0 MeV

Abstract

Stopping powers of havar (a cobalt based alloy) for protons from 0.45 to 3.0 MeV have been measured with an uncertainty of ±0.35% using the accelerator at Nara Women's University. The results agree fairly well with experimental data reported by Duder et al. [J.C. Duder, J.F. Clare, H. Naylor, Nucl. Instr. and Meth. 123 (1975) 89] within the uncertainties. The results also have been compared with the calculated stopping power values obtained by Bragg's additivity rule using the stopping power values for constituent elements calculated by Janni [J.F. Janni, At. Data Nucl. Data Tables 27 (1982) 147] and by Andersen and Ziegler's formula [H.H. Andersen, J.F. Ziegler, Hydrogen Stopping Powers and Ranges in All Elements, Pergamon Press, New York, 1977]. Applying the modified Bethe–Bloch formula for the stopping power of compounds assuming the validity of Bragg's additivity rule, we extracted an effective mean excitation energy, I value, for havar from the stopping power data.