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arXiv · 2607.12677

Role of the pre-equilibrium particle emission in the $^{249-251}$No production in the $^{204}$Pb($^{48}$Ca, xn)$^{252-x}$No reaction

Yu. L. Parfenova·M. S. Tezekbayeva·I. A. Egorova·A. N. Ismailova
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Abstract

Experimental data on the production of $^{250}$No in its ground and isomeric states in the $^{204}$Pb($^{48}$Ca,2n)$^{250}$No reaction at $^{48}$Ca beam energies from 200 to 240 MeV are analyzed within a unified approach combining the Hauser--Feshbach statistical model and the Griffin exciton model, assuming the emission of one pre-equilibrium particle. The influence of pre-equilibrium processes on the production cross sections of the $^{249-251}$No isotopes is investigated. The inclusion of pre-equilibrium light-particle emission significantly improves the description of the measured production cross sections, particularly in the high-energy region, where differences of several orders of magnitude are obtained, and for the population of the ground and isomeric states of $^{250}$No. The proposed approach also reproduces the observed incident-energy dependence of the residual-nucleus production cross sections.

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Yu. L. Parfenova, M. S. Tezekbayeva, I. A. Egorova, A. N. Ismailova. 2026-07-22. Role of the pre-equilibrium particle emission in the $^{249-251}$No production in the $^{204}$Pb($^{48}$Ca, xn)$^{252-x}$No reaction. https://arxiv.org/abs/2607.12677

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