arXiv subjects

A. Tabachenko

Publications and source records attributed to A. Tabachenko.

2 recordsLinked to original sources

arXiv2017

Spectator isobar production in the $A\left( {\gamma ,\pi NN} \right)B$ reaction

We present an analysis of the spectator mechanism of $\Delta $-isobar production in the pion photoproduction on nuclei with the emission of two nucleons. The reaction mechanism is studied within the framework of the $\Delta N$-correlation model, which considers the isobar and nucleon of the $\Delta N$-system produced in the nucleus at the virtual $NN \to \Delta N$ transition, to be in a dynamic relationship. The two-particle transition operator for nuclei is obtained by the \textit{S}-matrix approach. We consider the properties of the spectator mechanism of isobar production using the example of the reaction $^{16}$O$ (\gamma ,\ \pi ^{ - }pn)^{14}$O. Numerical estimates of the cross section are obtained in the kinematic region, where it is possible to expect the manifestation of bound isobar-nuclear states.

nucl-th↗

arXiv2013

Photoproduction of $\pi^+p$ Pairs on the $^{16}$O Nucleus and Isobar Configurations

The yield of the $^{16}$O$(\gamma ,\pi^{+} p)$ reaction has been measured in the region of the excitation of the $\Delta(1232)$ isobar at high momentum transfers to the residual nuclear system. The experimental data are interpreted within the model taking into account of isobar configurations in the ground state of the $^{16}$O nucleus. Direct and exchange mechanisms of the production of pions with emission of one and two nucleons, which follow from the structures of the density matrices for these reactions, have been considered. The probability of the production of the $\Delta$ isobar in the ground state of the $^{16}$O nucleus has been empirically estimated as $P_ {\Delta} = 0.019 \pm 0.003 \pm 0.003$.

nucl-th↗