Monitoring of the Photon Beam
Presented are the characteristics of systems for monitoring the intensity of the bremsstrahlung photon beam of the PAKHRA accelerator based on Cherenkov counters.
physics.ins-det↗
arXiv subjects
Yu. F. Krechetov
Publications and source records attributed to Yu. F. Krechetov.
Calibration of a Shower Lead-Scintillation Spectrometer by Cosmic Radiation
The results of calibration by cosmic muons of a shower lead-scintillation spectrometer of the sandwich type designed to work in high-intensity photon and electron beams with an energy of 0.1 - 1.0 GeV are presented. It was found that the relative energy resolution of the spectrometer depends on the angle of entry of cosmic muons into the spectrometer in the vertical plane and does not depend on the angle of entry in the horizontal plane. The relative energy resolution of the spectrometer was 16%. Placing an additional lead-scintillation assembly in front of the spectrometer improved the relative energy resolution of the spectrometer to 9%.
physics.ins-det↗
Determination of the Energy Characteristics of an Electron Beam using a Light Scintillator
The possibility of using the effect of full energy absorption in a light scintillator when an electron beam passes through it to determine the energy characteristics of a low and medium energy beam (the absorbed energy method) is experimentally presented. The energy calibration of the quasi-monochromatic electron beam of the Pakhra accelerator of the P. N. Lebedev Physical Institute of the Russian Academy of Sciences using scintillation detectors with a thickness of 14.5, 20, 23.5 and 51.2 cm was performed. For electron beam energies up to about 100 MeV and scintillation detector thicknesses from 5 to 20 cm the accuracy of electron beam energy determination was 10 to 20%, respectively.
physics.ins-det↗
Characteristics of the secondary electrons calibration beam of the accelerator S-25R "Pakhra"
The characteristics of the secondary electrons` calibration quasi-monochromatic beam of the accelerator S-25R "Pakhra" of the Lebedev Physical Institute of the Russian Academy of Sciences (LPI) on the basis of magnet SP-57 are presented. With an electron energy in the range of 45-280 MeV, a collimator diameter in front of the trigger counters of 3 mm and copper Converter thicknesses of 1-3 mm, the energy resolution and beam intensity were 4.4-2.2% and around 16 e/sec, respectively.
physics.ins-det↗
Detection of low energy electrons by a total absorption Cherenkov spectrometer
Presented are results of calibration, with a quasi-monochromatic electron beam, of a total absorption Cherenkov spectrometer based on the 14.8 X0 lead glass TF-1. It was found that the energy resolution of the spectrometer was 89% to 10% in the energy range of the electron beam E = 6 to 285 MeV, respectively.
physics.ins-det↗
Search for Delta^++ component in 12^C ground state using 12^C(gamma, pi^+ p) reaction
The differential cross section for the $^{12}$C$(γ,π^{+}p)$ reaction has been measured in the $Δ$(1232) resonance region at high recoil momenta of the residual nuclear system. The data are analyzed under the assumption that the formation of the $π^+p$ pairs may be interpreted as a $γΔ^{++}\toπ^+p$ process which takes place on a $Δ^{++}$ preexisting in the target nucleus. Estimates of the $Δ^{++}$ momentum distribution $ρ_{Δ^{++}}(\bar{p})$=0.17 fm$^3$ for a mean momentum $\bar{p}=300\pm49$ MeV/c as well as the number of $Δ$ isobars per nucleon $N_Δ=0.017$ were obtained for $^{12}$C.
nucl-ex↗
Search for the $Δ^{++}$ component in $^{12}C$ ground state using $^{12}C(γ, π^{+}p)$ reaction
The differential cross section for the reaction $^{12}$C$(γ,π^{+}p)$ has been measured in the $Δ$ resonance region at high recoil momenta of the residual nuclear system. The data are analysed under the assumption that the formation of $π^+p$ pairs may be interpreted as $γΔ^{++}\toπ^+p$ process, proceeding on the $Δ^{++}$ constituent in a target nucleus. As a result, the estimation $N_Δ=0.028\pm 0.008$ deltas per nucleon in $^{12}$C was obtained.
nucl-ex↗