Measurement of isomeric cross-section ratios for the Sc-45(gamma,n)Sc-44m,Sc-g, Ti-nat (gamma,x)Sc-44m,Sc-g, Rh-103(gamma,4n)Rh-99m,Rh-g, and Fe-nat (gamma,x)Mn-52m,Mn-g reactions induced by 65-MeV bremsstrahlung

Abstract

We measured isomeric cross-section ratios for the Sc-45(gamma,n)(SC)-S-44m,g, Ti-nat (gamma,x)(SC)-S-44m,g, Rh-103(gamma,4n)Rh-99m,Rh-g, and Fe-nat(gamma,x)Mn-52m,Mn-g reactions at the 65-MeV electron linac of the Po-hang Accelerator Laborator by using the activation method. Samples of natural Sc, Ti, Rh, and Fe metallic foils were irradiated in an uncollimated bremsstrahlung beam. The isomeric cross-section ratios were determined from the activity measurement with a high-purity germanium detector. The measured isomeric ratios were 0.21 +/- 0.03, 0.12 +/- 0.03, 1.43 +/- 0.20, and 0.28 +/- 0.04 for the Sc-45(gamma,n)Sc-44m,Sc-g, Ti-nat (gamma,x)Sc-44m,Sc-g, Rh-103(gamma,4n)Rh-99m,Rh-g, and Fe-nat(gamma,x)Mn-52m,Mn-g reactions, respectively. The present results for the Sc-45(gamma,n)Sc-44m,Sc-g and Fe-nat(gamma,x)Mn-52m,Mn-g reactions are in good agreement with other measurements. The present results for Ti-nat(gamma,x)(44m,g) Sc and Rh-103(gamma,4n)Rh-99m,Rh-g reactions are the first such measurements.