arXiv subjects

V. A. Bocharov

Publications and source records attributed to V. A. Bocharov.

3 recordsLinked to original sources

arXiv2023

Isomeric pair ${^{95\rm m,g}\rm{Nb}}$ in photonuclear reactions on $^{\rm nat}$Mo at end-point bremsstrahlung energy of 35-95 MeV

The ${^{\rm nat}\rm{Mo}}(γ,x\rm np)^{95\rm m,g}$Nb photonuclear reaction was studied using the electron beam from the NSC KIPT linear accelerator LUE-40. Experiment was performed using the activation and off-line $γ$-ray spectrometric technique. The experimental isomeric yield ratio $d(E_{\rm{γmax}}) = Y_{\rm m}(E_{\rm{γmax}}) / Y_{\rm g}(E_{\rm{γmax}})$ was determined for the reaction products $^{95\rm m,g}\rm{Nb}$ at the end-point bremsstrahlung energy $E_{\rm{γmax}}$ range of 35-95 MeV. The obtained values of $d(E_{\rm{γmax}})$ are in satisfactory agreement with the results of other authors and extend the range of previously known data. The theoretical values of the yields $Y_{\rm m,g}(E_{\rm{γmax}})$ and the isomeric yield ratio $d(E_{\rm{γmax}})$ for the isomeric pair $^{95\rm m,g}\rm{Nb}$ from the ${^{\rm nat}\rm{Mo}}(γ,x\rm np)$ reaction were calculated using the partial cross-sections $σ(E)$ from the TALYS1.95 code for six different level density models $LD$. The comparison showed a noticeable excess (more than 3.85 times) of the experimental isomeric yield ratio over all theoretical estimates. At the investigated range of $E_{\rm{γmax}}$ the theoretical dependence of $d(E_{\rm{γmax}})$ on energy was confirmed - the isomeric yield ratio smoothly decreases with increasing energy.

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arXiv2022

Photonuclear reactions cross-sections at energies up to 100 MeV for different experimental setups

In experiments on the electron linac LUE-40 of RDC "Accelerator" NSC KIPT, the flux-averaged cross-sections $\langle{σ(E_{\rm{γmax}})}\rangle_{\rm{exp}}$ of photonuclear reactions ${^{100}\rm{Mo}}(γ,n)^{99}\rm{Mo}$, ${^{27}\rm{Al}}(γ,x)^{24}\rm{Na}$, ${^{93}\rm{Nb}}(γ,n)^{92m}\rm{Nb}$, ${^{93}\rm{Nb}}(γ,3n)^{90}\rm{Nb}$, and ${^{181}\rm{Ta}}(γ,n)^{180g}\rm{Ta}$ were measured using the $γ$-activation technique. The theoretical flux-average cross-sections $\langle{σ(E_{\rm{γmax}})}\rangle_{\rm{th}}$ were computed using the partial cross-section $σ(E)$ values from the TALYS1.9-1.95 codes and bremsstrahlung $γ$-flux calculated using GEANT4.9.2. Two different experimental setups were used in the experiments: an aluminum electron absorber and a deflecting magnet to clean the bremsstrahlung $γ$-flux from electrons. A comparison of the flux-average cross-sections measured for two experimental setups was performed. The possibility of using the reactions ${^{100}\rm{Mo}}(γ,n)^{99}\rm{Mo}$, ${^{27}\rm{Al}}(γ,x)^{24}\rm{Na}$, ${^{93}\rm{Nb}}(γ,n)^{92m}\rm{Nb}$, ${^{93}\rm{Nb}}(γ,3n)^{90}\rm{Nb}$, and ${^{181}\rm{Ta}}(γ,n)^{180g}\rm{Ta}$ as monitors of the bremsstrahlung $γ$-flux for the energy range 30-100 MeV was investigated.

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arXiv2022

Photonuclear reactions $^{nat}$Ni($γ$,xn)$^{57}$Ni and $^{nat}$Ni($γ$,xn)$^{56}$Ni in the energy range E$_{γmax}$ = 35...94 MeV

The total bremsstrahlung flux-averaged cross-sections <$σ$(E$_{γmax}$)> for the photonuclear reactions $^{nat}$Ni($γ$,xn)$^{57}$Ni and $^{nat}$Ni($γ$,xn)$^{56}$Ni have been measured in the range of end-point energies E$_{γmax}$ = 35...94 MeV. The experiments were performed with the beam from the NSC KIPT electron linear accelerator LUE-40 with the use of the activation and off-line $γ$-ray spectrometric technique. The calculation of the flux-average cross-sections <$σ$(E$_{γmax}$)>$_{th}$ was carried out using the partial cross-section values $σ$(E) computed with the TALYS1.95 code and bremsstrahlung $γ$-flux calculated by GEANT4.9.2. The experimental results are compared with theoretical calculations and data from the literature. The obtained <$σ$(E$_{γmax}$)> values expand the energy range of previously known experimental data.

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