The differential cross section for γ p→ K^+Λ(1520) was measured from threshold to a centre-of-mass energy of 2090 MeV at forward angles at the BGOOD experiment. The high statistical precision and resolution in centre-of-mass energy and angle allows a detailed characterisation of this low-momentum transfer kinematic region. The data agree with a previous LEPS measurement and support effective Lagrangian models that indicate that the contact term dominates the cross section near threshold.

The photon beam asymmetry of the C-12((gamma) over right arrow, p(01))(11) B and C-12((gamma) over right arrow, p(2-6))(11) B reactions has been measured in the energy range 40-65 MeV, using a tagged, linearly-polarized photon beam at the MAX-lab facility in Sweden. The asymmetry of the C-12((gamma) over right arrow, p(01))(11) B reaction to ground and first excited state of (11) B is Sigma approximate to 0.82 over the measured energy range. The main contribution to the C-12((gamma) over right arrow, p(2-6))(11) B reaction to higher excited states comes from processes in which the residual nucleus is in the 3/2(-)(5.02MeV) or 7/2(-)(6.74MeV) excited states. The asymmetry of this reaction is Sigma approximate to 0.6, close to the value for free deuteron photodisintegration.

The photon beam asymmetry of the C12(γ→,p01)11B and C12(γ→,p2−6)11B reactions has been measured in the energy range 40–65 MeV, using a tagged, linearly-polarized photon beam at the MAX-lab facility in Sweden. The asymmetry of the C12(γ→,p01)11B reaction to ground and first excited state of B11 is Σ≈0.82 over the measured energy range. The main contribution to the C12(γ→,p2−6)11B reaction to higher excited states comes from processes in which the residual nucleus is in the 3/2−(5.02 MeV) or 7/2−(6.74 MeV) excited states. The asymmetry of this reaction is Σ≈0.6, close to the value for free deuteron photodisintegration.

The photon beam asymmetry of the C12(γ→,p01)11B and C12(γ→,p2−6)11B reactions has been measured in the energy range 40–65 MeV, using a tagged, linearly-polarized photon beam at the MAX-lab facility in Sweden. The asymmetry of the C12(γ→,p01)11B reaction to ground and first excited state of B11 is Σ≈0.82 over the measured energy range. The main contribution to the C12(γ→,p2−6)11B reaction to higher excited states comes from processes in which the residual nucleus is in the 3/2−(5.02MeV) or 7/2−(6.74MeV) excited states. The asymmetry of this reaction is Σ≈0.6, close to the value for free deuteron photodisintegration.

The angular dependences of the coherent and incoherent parts of the coherent bremsstrahlung (CB) are different, thus the CB beam tagging efficiency differs from that of the bremsstrahlung. It has energy dependence close to the CB beam spectrum and depends on the CB peak energy. Thus, in the course of the cross section measurements, the systematic, measurements of the tagging efficiency should be usually produced. The paper shows that tagging efficiency can be estimated computationally by taking into account the background contribution to the detectors of the tagging system. This allows one to get cross sections simultaneously with the cross section asymmetry measurements in the case when the systematic tagging efficiency measurements were not performed.

The article considers possible characteristics of low-intensity secondary positron and electron beams, which can be obtained using an electron accelerator with energy of ~100 MeV and average current of some μA. Preliminary simulation shows that using a tungsten converter of 2X0 thick and collimation of secondary particles beam, such accelerator allows one to get electron and positron secondary beams with energy of ~ 5…70 MeV, intensity of ~10-6-8 from the primary electron beam intensity, and energy spread of about some percent. Such low-intensity beams can be used for researches in the field of interaction of radiation with amorphous ubstances and crystals, testing detectors and scintillation materials.

General provisions of the Concept of development of basic and applied research at the Institute of High Energy and Nuclear Physics of the NSC KIPT are presented taking into account contemporary world trends. An analysis of the status and main research directions in Ukraine was carried out, with illuminating general problems, reasons for their occurrence and possible ways for their solution. At present, the main problem is the loss of material, technological and labor resources due to the military aggression of the Russian Federation against Ukraine. Implementation of the main provisions of the proposed concept will restore the research potential of the NSC KIPT as a leading research institution of the National Academy of Sciences (NAS) of Ukraine in the post-war period.

The results of self-consistent beam dynamics simulation are presented for the linac of the NESTOR storage ring. Consideration is given to the influence of particle energy change at the output of the electron gun during the current pulse. The obtained data have formed the basis for the computation of the beam transport line for research in the field of high energy physics.

The possibility of creating an experimental setup in building No.3 of the IHEPNP NNC KIPT (LUE-300 complex) on the basis of the existing LUE-60 electron accelerator and the existing experimental infrastructure is being discussed. It is planned to raise the energy of the electron beam to 100MeV and create two beam lines: one is for reaserches with intense beams of electrons and photons, including linearly polarized ones, and the other – for investigations with the low intensive beams of electrons and positrons. Implementation of the project will open opportunities for a wide range of research programs in the field of interaction of the radiation with amorphous and crystalline matter, nuclear physics and astrophysics, as well as in the applied research.

The asymmetry of the cross section of the 12C(γ,p0)11B and 12C(γ,p1)11B reactions has been measured in the energy range 40...55MeV using linearly polarized tagged photons of the MAX-lab facility. The asymmetry of the process 12C(⃗γ,p0)11B is Σ ≈ 0.85, that implies one-particle reaction mechanism. The asymmetry of the reaction 12C(⃗γ,p1)11B is smaller, Σ ≈ 0.6...0.7, that may be due to the stronger relative contribution of the 2h−1p mechanism to the dominant one-particle reaction mechanism.

The asymmetry of the cross section of the C-12((gamma) over right arrow, p(0))B-11 and C-12((gamma) over right arrow ,p(1))B-11 reactions has been measured in the energy range 40...55MeV using linearly polarized tagged photons of the MAX-lab facility. The asymmetry of the process 12 C((gamma) over right arrow, p(0))B-11 is Sigma approximate to 0.85, that implies one-particle reaction mechanism. The asymmetry of the reaction C-12((gamma) over right arrow, p(1))B-11 is smaller, Sigma approximate to 0.6...0.7, that may be due to the stronger relative contribution of the 2h mechanism to the dominant one-particle reaction mechanism.

On the base of reaction of deuteron photo-disintegration it was studied possibility of the simultaneous measuring of cross sections and asymmetry of the (gamma,p) reactions at the using of the coherent polarized photon beam. Measurements were performed for the proton emission angle 90 degrees. The cross sections well agree with the literary data, obtained on the bremsstrahlung photon beam in the range of energies 45...80 MeV.

The gamma-radiation by electrons with the energy of similar to 200 MeV in a 100 mu m-thick diamond crystal has been measured at the MAX-lab experimental facility, when the electrons are incident on the crystal along the (100) axis. In this case, the intensity of the -radiation with the energy similar to l-2 MeV is approximately 16 times higher than that in amorphous matter of the same thickness. Theoretical calculations based on the quasi-classical QED approximation are in good agreement with the experimental data. The analysis of the radiation mechanisms has shown that the main contribution to the radiation intensity resulted from electrons, moving in the above-barrier regime and at small angles to the crystal axis.

Extraction and collimation of the 50-GeV proton beam with a bent silicon crystal at the U-70 accelerator of the Institute for High Energy Physics (Protvino, Russia) was investigated. Until recently, proton beam extraction (and collimation) from accelerators has been effected using crystals with the (111) or (110) plane orientation, when the beam propagates far from the crystal axes. In the described experiment, the silicon crystal was oriented so that the proton beam was incident on it near the 〈110〉 axis. Under these conditions, a part of the beam was deflected by the crystal owing to the dynamic chaos phenomenon. The maximum beam extraction efficiency was as high as ~80%.

Information on the triggered strips of silicon strip detectors of a MAX-lab Delta E-E CsI/SSD-telescope was used to determination the angular range of emitted reaction particles. It allowed an improvement in the energy resolution of the telescope by decreasing the kinematical broadening of the missing energy spectra of C-12(gamma,p)B-11 reaction, and enabling more accurate separation of exited states of residual nucleus.

The paper considers the results of experiments on the reactions 12C(γ, p)11B and d(γ, p)n in the energy range of tagged photons 35...80 MeV. Demonstrated the possibility identification of protons by ΔE - E using CsI/SSD telescope. Using the spectra of the missing energy defined the values of differential cross sections of these reactions in the range of photon energies. The good agreement of the experimental results with the available data in the literature.

The efficiency of the deflection of 50-, 15-, and 1.3-GeV proton beams by means of planar channeling in a bent silicon crystal has been compared to that by means of the stochastic mechanism of the deflection of charged particles by the bent crystal. The deflection of protons at single passage through the crystal has been simulated. The results of the experiment on the deflection of a circulating beam at the U-70 accelerator (Institute for High Energy Physics, Protvino, Moscow region) are presented. It has been shown that the efficiency of the stochastic deflection mechanism increases with a decrease in the energy, whereas the efficiency of the planar channeling for deflection decreases.

The experimental layout designed to study properties of focused parametric X-ray radiation generated by relativistic protons in a bent crystal and parametric X-ray radiation generated by relativistic ions and positrons at accelerator U70 is described. Preliminary results of measurements of spectra of characteristic and parametric X-rays observed at 50 GeV proton beam are shown and discussed. The origin of the background radiation that obstacles for detail research of the PXR properties at proton beam is identified. Moreover, the distribution of the ionization losses of relativistic charged particles in the X-ray detector similar to Landau distribution is measured and discussed.