Production cross sections of fission products via 20.9 MeV proton irradiation of 232Th

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Abstract

Using the activation technique without chemical separation, cross sections for the production of 119 fission products — from 72Zn to 151Pm — belonging to 32 different chemical elements (Zn, Ga, Ge, As, Br, Se, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Te, I, Xe, Cs, Ba, La, Ce, Pr, Nd, Pm) were measured under independent irradiation of two metallic 232Th foils with 20.9 MeV protons. The irradiations were carried out at the NS-21M facility, based on the I-2 linear proton accelerator, and lasted 1 hour and 1 minute. The proton flux was determined using monitor reactions natCu(p, x)62Zn and natCu(p, x)63Zn. The obtained results, together with data from other authors available in the EXFOR database and our previously measured data (also included in EXFOR) for proton energies of 100, 200, 800, 1200, and 1600 MeV, are presented in the form of excitation functions and mass yield curves. The fission product cross sections of 232Th were modeled using the PHITS-3.31 code with the INCL4.6/GEM, JAM/GEM, and Bertini/GEM models for 42 proton energies in the range from 0.01 to 3 GeV. Cumulative cross sections for fission products in the mass range 72 < A < 151 were computed using custom software based on the independent cross sections obtained from PHITS-3.31 output. For selected proton energies (20.9, 100, 200, 800, 1200, and 1600 MeV), a comparison between calculated and experimental results was performed using standard statistical criteria (, and ), allowing evaluation of the predictive performance of each model implemented in PHITS-3.31. In addition, the GEF2023/2.1 code was used to analyze the mass yields of 232Th fission products.

About the authors

Yu. E. Titarenko

NRC “Kurchatov Institute”

Email: yury.titarenko@itep.ru
Moscow, Russia

A. A. Arkhipov

NRC “Kurchatov Institute”

Moscow, Russia

S. A. Balyuk

NRC “Kurchatov Institute”

Moscow, Russia

V. F. Batyaev

NRC “Kurchatov Institute”

Moscow, Russia

M. V. Batyaeva

NRC “Kurchatov Institute”

Moscow, Russia

V. D. Davidенко

NRC “Kurchatov Institute”

Moscow, Russia

V. M. Zhivun

NRC “Kurchatov Institute”

Moscow, Russia

Ya. O. Zaritskiy

NRC “Kurchatov Institute”

Moscow, Russia

A. A. Kovalishin

NRC “Kurchatov Institute”

Moscow, Russia

M. V. Kotelniy

NRC “Kurchatov Institute”

Moscow, Russia

A. S. Kirsanov

NRC “Kurchatov Institute”

Moscow, Russia

T. V. Kulevoy

NRC “Kurchatov Institute”

Moscow, Russia

I. V. Mednikov

NRC “Kurchatov Institute”

Moscow, Russia

B. A. Novikov

NRC “Kurchatov Institute”

Moscow, Russia

A. V. Orlov

NRC “Kurchatov Institute”

Moscow, Russia

K. V. Pavlov

NRC “Kurchatov Institute”

Moscow, Russia

V. S. Stolbunov

NRC “Kurchatov Institute”

Moscow, Russia

A. Yu. Titarenko

NRC “Kurchatov Institute”

Moscow, Russia

R. S. Tikhonov

NRC “Kurchatov Institute”

Moscow, Russia

M. N. Shlenskii

NRC “Kurchatov Institute”

Moscow, Russia

N. A. Kovalenko

NRC “Kurchatov Institute”

Moscow, Russia

S. E. Vinokurov

Vernadsky Institute of Geochemistry and Analytical Chemistry

Moscow, Russia

A. G. Kazakov

Vernadsky Institute of Geochemistry and Analytical Chemistry

Moscow, Russia

E. Yu. Khvorostinin

Vernadsky Institute of Geochemistry and Analytical Chemistry

Moscow, Russia

A. V. Ignatyuk

Leypunsky Institute of Physics and Power Engineering

Obninsk, Russia

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