Measurement of isomeric yield ratios for the 44m,gSc isomeric pairs produced from 45Sc and natTi targets at 50-, 60-, and 70-MeV bremsstrahlung
- 102 Downloads
We measured the isomeric yield ratios for the 44m,gSc isomeric pairs produced from different reaction channels 45Sc(γ,n)44m,gSc and natTi(γ,xnp)44m,gSc by using the activation method and γ-ray spectroscopic methods at 50-, 60-, and 70-MeV bremsstrahlung energies. The high-purity natural Sc and Ti foils in disc shape were irradiated with uncollimated bremsstrahlung beams generated from an electron linear accelerator at Pohang Accelerator Laboratory. The induced activities in the irradiated foils were measured by the high-resolution γ-ray spectrometric system which consists of a high-purity Germanium detector and a multichannel analyzer. In order to improve the accuracy of the experimental results the necessary corrections were made in the γ-ray activity measurements and data analysis. The measured isomeric yield ratios for the 45Sc(γ,n)44m,gSc reaction are 0.20 ± 0.02, 0.21 ± 0.02, and 0.21 ± 0.02 and those for the natTi(γ,xnp)44m,gSc reaction are 0.063 ± 0.012, 0.079 ± 0.014, and 0.124 ± 0.022 at 50-, 60-, and 70-MeV bremsstrahlung energies, respectively. The obtained results are compared with the corresponding values found in the literature. We observed that the isomeric yield ratios for the 45Sc(γ,n)44m,gSc reaction increase rapidly with the increasing bremsstrahlung energies from the reaction threshold up to giant resonance region, and then those are almost constant in the energy range from about 30 to 2.5 GeV. The isomeric yield ratios for the natTi(γ,xnp)44m,gSc reaction increase with increasing bremsstrahlung energies in a wide range of bremsstrahlung energies from 50 to 2.5 GeV.
KeywordsIsomeric yield ratio Photonuclear reactions 45Sc(γ,n)44m,gSc natTi(γ,xnp)44m,gSc Activation method 50,- 60,- and 70-MeV bremsstrahlung HPGe detector
The authors would like to express their sincere thanks to the staffs of Pohang Accelerator Laboratory for excellent operation of the electron linac and their strong support. This work was supported by the National Research Foundation of Korea (NRF) through a Grant provided by the Korean Ministry of Education, Science and Technology (MEST) in 2010 (Project Nos. 2010-0018498 and 2010-0021375), by the Institutional Activity Program of Korea Atomic Energy Research Institute (KAERI), and by the Vietnam National Foundation for Science and Technology Development (NAFOSTED).
- 8.Bethe HA (1973) Rev Mod Phys 9:84Google Scholar
- 23.Zheltonozhski VA, Mazur VM (2000) Yad Fiz 63:389Google Scholar
- 24.Davidov MG, Magera VG, Trukhov AV, Shomurodov EM (1985) Atom Energy 58:47Google Scholar
- 30.Nguyen VD, Pham DK, Tran DT, Phung VD, Lee YS, Lee HS, Cho MH, Ko IS, Namkung W, Meaze AKMMH, Devan K, Kim GN (2006) J Korean Phys Soc 48:382Google Scholar
- 33.Kim GN, Lee YS, Skoy V, Kovalchuck V, Cho MH, Ko IS, Namkung W, Lee DW, Kim HD, Ro TI, Min YG (2001) J Korean Phys Soc 38:14Google Scholar
- 34.Kim GN, Ahmed H, Machrafi R, Son D, Skoy V, Lee YS, Kang H, Cho MH, Ko IS, Namkung W (2003) J Korean Phys Soc 42:479Google Scholar
- 35.Firestone RB (1996) Table of Isotopes. Wiley-Interscience, Hoboken (CD Rom Edition)Google Scholar
- 36.Debertin K, Heimer RG (1988) Gamma and X-ray spectrometry with semiconductor detectors. North Holland Elsevier, New YorkGoogle Scholar
- 37.de Bruin M, Korthoven PJM (1974) Radiochem Radioanal Lett 19:153Google Scholar
- 39.Tran DT, Truong TA, Nguyen TK, Phan VC, Nguyen TV (2010) J Radioanal Nucl Chem. doi: 10.1007/s10967-010-0630-5