Photo-neutron reaction cross section for nat-Zr in the end-point bremsstrahlung energies of 12 - 16 and 45 - 70 MeV


Photo-neutron reaction cross section for nat-Zr in the end-point bremsstrahlung energies of 12 - 16 and 45 - 70 MeV

Naik, H.; Kim, G. N.; Schwengner, R.; Kim, K.; Zaman, M.; Yang, S. C.; Lee, M. W.; Shin, S. G.; Gey, Y.; Massarczyk, R.; John, R.; Junghans, A.; Wagner, A.; Goswamia, A.; Cho, M.-H.

The natZr(γ, xn)89-86Zr reaction cross-sections were experimentally determined at the end-point bremsstrahlung energies of 12, 14, 16, 45, 50, 55, 60 and 70 MeV by activation and off-line γ-ray spectrometric technique using the 20 MeV electron linac (ELBE) at Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany and 100 MeV electron linac at Pohang Accelerator Laboratory (PAL), Pohang, Korea. The natZr(γ, xn)89-86Zr reaction cross-sections as a function of photon energy were also calculated theoretically using TALYS 1.4 computer code. The flux-weighted average values at the end-point energies of 12-16 and 45-70 MeV were obtained from the literature and the TALYS data based on mono-energetic photon and are found to be in good agreement with the present dat. It was also found that the present data and the flux-weighted literature and theoretical values for the natZr (γ, xn)89-86Zr reaction cross-sections increase from the threshold values to a certain energy, where other reaction channels opens. This indicates the role of excitation energy. However, the increase trend of natZr(γ, xn)89,88Zr reaction cross-sections are sharper from the threshold value up to end-point bremsstrahlung energies of 17-22 MeV compared to the same for natZr(γ, xn)87,86Zr reactions. This is due to the Giant Dipole Resonance (GDR) effect besides the role of excitation energy. After a certain values, the individual natZr (γ, xn) reaction cross sections decrease with increase of bremsstrahlung energy due to opening of other reactions, which indicates portioning of energy in different channels.

Keywords: Photonuclear reactions; photoactivation; electron accelerators; bremsstrahlung; cross sections; statistical-model calculations

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Publ.-Id: 20136