Abstract
The independent isomeric yield ratios of 148Pm from the natSm(γ, x) reaction at the end-point bremsstrahlung energy of 45–64 MeV have been determined using an off-line γ-ray spectrometric technique at the 100 MeV electron linac of Pohang accelerator laboratory, Pohang, Korea. We also have determined the isomeric yield ratios of 148Pm from the natNd(p,xn) reactions in the proton energy of 5.08–44.72 MeV by a stacked-foil activation and an off-line γ-ray spectrometric techniques at the MC-50 cyclotron of the Korean Institute of Radiological and Medical Sciences, Korea. The determined isomeric yield ratios of 148Pm were compared with literature data and theoretical values estimated by the TALYS 1.4. The present data along with the similar data from literature at other energies shows that the isomeric yield ratio of 148Pm increases with the excitation energy both in the natSm(γ, x) and the natNd(p, xn) reactions. The isomeric yield ratios of 148Pm from the natNd(p, xn) reactions are always higher than those from the natSm(γ, x) reactions at the same excitation energy, which indicate the role of input angular momentum besides excitation energy.
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Acknowledgments
The authors are thankful to the staff of electron linac at Pohang Accelerator Laboratory (PAL) and the MC-50 Cyclotron in the Korea Institute of Radiological and Medical Science (KIRAMS) for the excellent operation and their support to carry out the experiments. This research partly was supported by the National Research Foundation of Korea through a grant provided by the Korean Ministry of Science, ICT and Future Planning (MSIP) (NRF-2013R1A2A2A01067340), by the Institutional Activity Program of Korea Atomic Energy Research Institute (KAERI), and by the Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant Number 103.04-2012.21.
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Yang, SC., Kim, G., Zaman, M. et al. Isomeric yield ratios of 148Pm from the natSm(γ, x) and the natNd(p, xn) reactions. J Radioanal Nucl Chem 302, 467–476 (2014). https://doi.org/10.1007/s10967-014-3284-x
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DOI: https://doi.org/10.1007/s10967-014-3284-x