Results of measurements of the analyzing powers for polarized neutrons on C, CH <inf>2</inf> and Cu targets for momenta between 3 and 4.2 GeV/c

The analyzing powers for neutron charge exchange nA → pX reactions on nuclei have been measured on C, CH2 and Cu targets at incident neutron momenta 3.0 - 4.2 GeV/c by detecting one charged particle in forward direction. The polarized neutron measurements are the first of their kind. The experiment was performed using the Nuclotron accelerator in JINR Dubna, where polarized neutrons and protons were obtained from breakup of a polarized deuteron beam which has a maximum momentum of 13 GeV/c. The polarimeter ALPOM2 was used to obtain the analyzing power dependence on the transverse momentum of the final-state nucleon. These data have been used to estimate the figure of merit of a proposed experiment at Jefferson Laboratory to measure the recoiling neutron polarization in the quasi-elastic 2H(e, e'n) reaction, which yields information on the charge and magnetic elastic form factors of the neutron

Cluster dynamics method for simulation of dynamic processes of continuum mechanics

Described here is the cluster dynamics method (CDM) which is one of the variants of particle method intended for simulation of the processes associated with large deformations and continuity violation of the material. The basic advantage of CDM is the possibility to choose the base cluster and allows the simulation of the processes in a wide range of spatial scales (from micrometer to tens of centimeters). Described here is the construction procedure for cluster interaction potentials corresponding to real equations of state of material by the example of typical metals. Numerical simulation of shock wave arrival at profiled plate surface and high-velocity target penetration was carried out using CDM. The computational results are compared with experimental data and other computational results. The results show that CDM can be used for full-scale simulation of large deformation and dynamic fracture of materials at impulse loading at characteristic rates of relative deformation of 103–106 s–1

Measurement of neutron and proton analyzing powers on CC, CHCH, CH2CH_2 and CuCu targets in the momentum region 3-4.2 GeV/c

International audienceThe analyzing powers for proton elastic scattering (\varvec{p} A\rightarrow pX) and neutron charge exchange (\varvec{n} A\rightarrow p X) reactions on nuclei have been measured on C, CH, $CH_2$ and Cu targets at incident neutron momenta 3.0–4.2 GeV/c by detecting one charged particle in forward direction. The polarized neutron measurements are the first of their kind. The experiment was performed using the Nuclotron accelerator in JINR Dubna, where polarized neutrons and protons were obtained from break-up of a polarized deuteron beam which has a maximum momentum of 13 GeV/c. The polarimeter ALPOM2 was used to obtain the analyzing power dependence on the transverse momentum of the final-state nucleon. These data have been used to estimate the figure of merit of a proposed experiment at Jefferson Laboratory to measure the recoiling neutron polarization in the quasi-elastic ^2H(\varvec{e},e'\varvec{n}) reaction, which yields information on the charge and magnetic elastic form factors of the neutron