Production of Hf in photoproton reaction Ta at energy –95 MeV

I. S. Timchenko; O. S. Deiev; S. N. Olejnik; S. M. Potin; L. P. Korda; V. A. Kushnir; V. V. Mytrochenko; S. A. Perezhogin; A. Herzáň

doi:10.1140/epja/s10050-023-01186-2

2024 Impact factor 2.8

Hadrons and Nuclei

Open Access

Eur. Phys. J. A (2023) 59: 268
https://doi.org/10.1140/epja/s10050-023-01186-2

Regular Article - Experimental Physics

Production of $^{180 m}$ ${^{180\textrm{m}}}$ Hf in photoproton reaction $^{181}$ ${^{181}}$ Ta $(γ, p)$ $(\gamma ,p)$ at energy $E_{γ \max} = 35$ $E_{\mathrm{\gamma max}} = 35$ –95 MeV

I. S. Timchenko¹^,2^a, O. S. Deiev², S. N. Olejnik², S. M. Potin², L. P. Korda², V. A. Kushnir², V. V. Mytrochenko²^,3, S. A. Perezhogin² and A. Herzáň¹

¹ Institute of Physics, Slovak Academy of Sciences, SK-84511, Bratislava, Slovakia
² NSC “Kharkov Institute of Physics and Technology”, National Academy of Sciences of Ukraine, 1 Academichna Str., 61108, Kharkiv, Ukraine
³ CNRS/IJCLAB, 15 Rue Georges Clemenceau Str., 91400, Orsay, France

^a iryna.timchenko@savba.sk, timchenko@kipt.kharkov.ua

Received: 9 August 2023
Accepted: 27 October 2023
Published online: 15 November 2023

Abstract

The production of the $^{180 m} Hf$ $^{180\textrm{m}}\textrm{Hf}$ nuclei in the photoproton reaction $^{181} Ta (γ, p)$ ${^{181}\textrm{Ta}}(\gamma ,p)$ was studied at end-point bremsstrahlung energies $E_{γ \max} = 35$ $E_{\mathrm{\gamma max}}=35$ –95 MeV. The experiment was performed at the electron linear accelerator LUE-40 NSC KIPT with the use of the $γ$ $\gamma$ activation and off-line $γ$ $\gamma$ -ray spectroscopy. The experimental values of the bremsstrahlung flux-averaged cross-sections ${⟨ σ (E_{γ \max}) ⟩}_{m}$ $\langle {\sigma (E_{\mathrm{\gamma max}})}\rangle _{\textrm{m}}$ for the $^{181} Ta {(γ, p)}^{180 m} Hf$ ${^{181}\textrm{Ta}}(\gamma ,p)^{180\textrm{m}}\textrm{Hf}$ reaction were determined, and at $E_{γ \max} > 55$ $E_{\mathrm{\gamma max}} > 55$ MeV obtained for the first time. The measured values, as well as the literature data, significantly (by more that an order of magnitude) exceed the theoretical flux-averaged cross-sections ${⟨ σ (E_{γ \max}) ⟩}_{th}$ $\langle {\sigma (E_{\mathrm{\gamma max}})}\rangle _{\textrm{th}}$ . The ${⟨ σ (E_{γ \max}) ⟩}_{th}$ $\langle {\sigma (E_{\mathrm{\gamma max}})}\rangle _{\textrm{th}}$ values were calculated using the cross-section $σ (E)$ $\sigma (E)$ computed with the TALYS1.95 code for six different level density models. A comparative analysis of the calculated total cross-sections from the TALYS computation for the reactions $^{181} Ta {(γ, p)}^{180} Hf$ ${^{181}\textrm{Ta}}(\gamma ,p)^{180}\textrm{Hf}$ and $^{181} Ta {(γ, n)}^{180} Ta$ ${^{181}\textrm{Ta}}(\gamma ,n)^{180}\textrm{Ta}$ was performed. It was shown that the photoproton $(γ, p)$ $(\gamma ,p)$ to photoneutron $(γ, n)$ $(\gamma ,n)$ strength ratio is consistent with the estimates based on the isospin selection rules and the value from the $(e, e^{'} p)$ $$(e,e'p)$$ experiment.

© The Author(s) 2023

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