THERMOLUMINESCENCE OF Ga2O3 IRRADIATED BY HIGH-DOSE PULSED ELECTRON BEAM

The TL curves of pure gallium oxide ceramics synthesized in a stream of fast electrons are studied. It is established that the TL curve is the sum of two peaks with activation energies of 0.84 and 0.95 eV. The nature of the dose characteristics of the TL of the studied material is analyzed

Separation of Flip and Non-Flip parst of Charge Exchange np->pn at energies Tn = 0.5 - 2.0 GeV

The new Delta-Sigma experimental data on the ratio $R_{dp}$ allowed separating the Flip and Non-Flip parts of the differential cross section of $np\to pn$ charge exchange process at the zero angle by the Dean formula. The PSA solutions for the $np\to np$ elastic scattering are transformed to the $np\to pn$ charge exchange representation using unitary transition, and good agreement is obtain.Comment: 7 pages, 2 figure

Search for the NN → 6q phase transition in the

The measurements of np-spin observables at $0^\circ$ have been performed for the first time on the Delta-Sigma experimental facility of LHE JINR up to Pn=4.5 GeV/c using the monochromatic neutron beam. They include detailed measurements of the $\Delta\sigma_{\rm L}(np)$ spin differences and the study of the $np\to pn$ elastic charge-exchange process. In the $\Delta\sigma_{\rm L}(np)$ and $-\Delta\sigma_{\rm L}({\rm I}=0)$ energy dependencies over the energy region T$_{\rm kin}=1.2$–3.7 GeV the peculiarity at 1.8 GeV was observed. Such energy behavior was predicted by the QCD approach as a signal of the $NN\!\to 6q$ phase transition. For the exhaustive investigation of this effect it is necessary to measure the energy dependence of the complete set of np observables with both longitudinal (L) and transverse (T) polarizations of the neutron beam and proton target. This will allow Direct Reconstruction of all three NN forward Scattering Amplitudes (DRSA) to be performed, and the observed peculiarity to be checked around T$_{\rm kin}=1.8$ GeV and at the higher energies using the Argand diagrams method

Measurements of the ratio R

New experimental results on the ratio Rdp of the quasi-elastic charge-exchange yield at the outgoing proton angle $\theta_{{p,{\rm Lab}}}^{}$ = 0° for the nd $\rightarrow$ p(nn) reaction to the elastic np $\rightarrow$ pn charge-exchange yield are presented. The measurements were carried out at the Nuclotron of the Veksler and Baldin Laboratory of High Energies of the JINR (Dubna) at the neutron beam kinetic energies of 0.55, 0.8, 1.0, 1.2, 1.4, 1.8 and 2.0GeV. The intense neutron beam with small momentum spread was produced by break-up of deuterons which were accelerated and extracted to the experimental hall. In both reactions mentioned above the outgoing protons with the momenta p p approximately equal to the neutron beam momentum p n, beam were detected in the directions close to the direction of incident neutrons, i.e. in the vicinity of the scattering angle $\theta_{{p,{\rm Lab}}}^{}$ = 0° . Measured in the same data taking runs, the angular distributions of the charge-exchange reaction products were corrected for the well-known instrumental effects and averaged in the vicinity of the incident neutron beam direction. These corrected angular distributions for every of nd $\rightarrow$ p(nn) and np $\rightarrow$ pn charge-exchange processes were proportional to the differential cross-sections of the corresponding reactions. The data were accumulated by the Delta-Sigma set-up magnetic spectrometer with two sets of multiwire proportional chambers located upstream and downstream of the momentum analyzing magnet. Inelastic processes were considerably reduced by the additional detectors surrounding the hydrogen and deuterium targets. The time-of-flight system was applied to identify the detected particles. The new Rdp data are compared with the existing ones, which were obtained below 1GeV, and with the calculations which were made using the phenomenological NN amplitude sets