Structure and Mechanisms of pHe Backward Elastic Scattering
نویسندگان
چکیده
The mechanism of pHe backward elastic scattering is studied. It is found that the triangle diagrams with the subprocesses pd →3Heπ0, pd →3Heπ0 and p(pp) →3Heπ+, where d and pp denote the singlet deuteron and diproton pair in the S0 state, respectively, dominate in the cross section at 0.3-0.8 GeV, and their contribution is comparable with that for a sequential transfer of a np pair at 1-1.5 GeV. The contribution of the d + pp, estimated on the basis of the spectator mechanism of the p(NN) →3Heπ reaction, increases the p3He→3He p cross section by one order of magnitude as compared to the contribution of the deuteron alone. Effects of the initial and final states interaction are taken into account.
منابع مشابه
Role of Intermediate Pions in pHe Backward Elastic Scattering
The mechanism of pHe backward elastic scattering is studied. It is found that the triangle diagrams with the subprocesses pd →Heπ and pd →Heπ, where d denotes a pn pair in the spin-singlet (S0) state, dominate in the cross section at 0.3-0.8 GeV, and their contribution is comparable with that for a sequential transfer of a np pair at 1-1.5 GeV. The contribution of the d, estimated on the basis ...
متن کاملBACKWARD ELASTIC p 3He-SCATTERING AND HIGH MOMENTUM COMPONENTS OF 3He WAVE FUNCTION
It is shown that owing to a dominance of np−pair transfer mechanism of backward elastic p Hescattering for incident proton kinetic energies Tp > 1 GeV the cross section of this process is defined mainly by the values of the Faddeev component of the wave function of He nucleus, φ(q23,p1), at high relative momenta q23 > 0.6GeV/c of the NN-pair in the S0− state and at low spectator momenta p1 ∼ 0−...
متن کاملQuantum interference between H + D2 quasiclassical reaction mechanisms.
Interferences are genuine quantum phenomena that appear whenever two seemingly distinct classical trajectories lead to the same outcome. They are common in elastic scattering but are seldom observable in chemical reactions. Here we report experimental measurements of the state-to-state angular distribution for the H + D2 reaction using the 'photoloc' technique. For products in low rotational an...
متن کاملNumerical simulation of a three-layered radiant porous heat exchanger including lattice Boltzmann simulation of fluid flow
This paper deals with the hydrodynamic and thermal analysis of a new type of porous heat exchanger (PHE). This system operates based on energy conversion between gas enthalpy and thermal radiation. The proposed PHE has one high temperature (HT) and two heat recovery (HR1 and HR2) sections. In HT section, the enthalpy of flowing high temperature gas flow that is converted to thermal radiation em...
متن کاملDISLOCATIONS STRUCTURE AND SCATTERING PHENOMENON IN CRYSTALLINE CELL SIZE OF 2024 AL ALLOY DEFORMED BY ONE PASS OF ECAP AT ROOM TEMPERATURE
Variation in microstructural features of 2024 aluminum alloy plastically deformed by equal channel angular pressing (ECAP) at room temperature, was investigated by X-Ray diffraction in this work. These include dislocation density dislocation characteristic and the cell size of crystalline domains. Dislocations contrast factor was calculated using elastic constants of the alloy such as C 11, C 2...
متن کامل