A. Manukyan | Searcharxiv

arXiv2026

Proton induced reactions on 118Sn target at energies up to 18 MeV

Proton-induced reactions on enriched 118Sn up to 18 MeV have been investigated. Using the stacked-foil activation technique, the excitation functions of the reactions 118Sn(p,n)118Sb, 118Sn(p,2n)117Sb, 118Sn(p,α)115mIn, and 118Sn(p,x)117mSn were measured. The available experimental data show good agreement with our measurements. The cross sections for the 118Sn(p,x)117mSn and 118Sn(p,α)115mIn reactions are reported for the first time. The measured cross sections were compared not only with previously published experimental results, but also with theoretical predictions from the TENDL-2023 (TALYS-based evaluated nuclear data library), TENDL-2025 and JENDL-5 (Japanese Evaluated Nuclear Data Library) libraries. Discrepancies between experimental and theoretical data were observed for reactions involving composite-particle emission, such as alpha particles and deuterons. These differences suggest that while current models adequately describe simple two-nucleon emission channels, further refinements are needed, particularly for modeling composite-particle emission at lower proton energies.

nucl-ex↗

arXiv2020

Development of cooling system of solid state target for irradiation under proton beam of C18 cyclotron

In recent years, the possibility of direct production of the 99mTc isotope (bypassing the parent 99Mo stage) for medical purposes using nuclear reactions on charged particle beams has been actively discussed around the world [1,2]. At A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), an activity is underway to develop a technology for producing the 99mTc isotope by irradiating a molybdenum target of 100Mo, pressed into a titanium base, with a proton beam of a C18 cyclotron [3,4,5]. One of the limitations of this technique is the utilization of heat released in the target as a result of proton energy loss [6,7]. The task of this work was the improvement of the thermal regime of a standard target for the C18 cyclotron due to a series of parallel grooves. Heat transfer experiments with prototypes of targets were carried out on a specially made test bench providing water cooling of its back side. A special Plexiglas thermal block was made to study the thermal processes in the target. The measurement results show that the above mentioned technique of processing the base of the target leads to a significant increase in the rate of cooling of the target, which will allow to irradiate at significantly higher proton beam intensities, which in its turn will increase the irradiation efficiency and reduce the cost of the final product.

physics.med-ph↗