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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Structure and Dynamics of Nuclei XIII

HK 61.2: Vortrag

Donnerstag, 23. März 2023, 14:15–14:30, SCH/A117

"Comparison of the probability of Bi-209 (γ, p5n) Pb-203 reaction at 60 MeV and 80 MeV " — •Jelena Bardak¹, Miodrag Krmar², and NIkola Jovančević² — ¹GSI Helmholtz Centre for Heavy Ion Research, Darmstadt, Germany and Faculty of Sciences, University of Novi Sad, Serbia — ²Faculty of Sciences, University of Novi Sad, Serbia

In several recently published papers, photonuclear reactions with a target of natural bismuth were studied. Irradiation of some heavy elements by the photons having energies up to 80 MeV, will give several products of (γ,xn) reactions. The emission of protons or other charged particles is less probable due to the Coulomb barrier. In this paper, an attempt was made to gain experimental evidence of Bi-209(γ,p5n)Pb-203 nuclear reaction by comparison of intensities of gamma lines following EC decay of Bi-203 and Pb-203. Pb-203 can be formed by (γ,p5n) nuclear reaction, but it is certainly created after the decay of Bi-203, obtained in Bi-209(γ,6n)Bi-203 reaction. After activation of the target from natural bismuth in photon beams of maximum energies of 60 MeV and 80 MeV, several gamma spectra were successively measured. Based on selected gamma lines from the measured spectra, the activities of Pb-203 and Bi-203 were monitored to assess the probability ratio for the occurrence of (γ,6n) and (γ,p5n) nuclear reactions. Furthermore, quantitative data concerning the probability of the mentioned reactions is extracted and compared to theoretical predictions.