Calculations Of Double Differential Cross Sections Research Articles

Electron-loss-to-continuum cusp in collisions of U89+ with N2 and Xe

We study the electron-loss-to-continuum (ELC) cusp experimentally and theoretically by comparing the ionization of U$^{89+}$ projectiles in collisions with N$_2$ and Xe targets, at a beam energy of 75.91 MeV/u. The coincidence measurement between the singly ionized projectile and the energy of the emitted electron is used to compare the shape of the ELC cusp at weak and strong perturbations. A significant energy shift for the centroid of the electron cusp is observed for the heavy target of Xe as compared to the light target of N$_2$. Our results provide a stringent test for fully relativistic calculations of double-differential cross sections performed in the first-order approximation and in the continuum-distorted-wave approach.

Calculations of double-differential triton emission cross sections at 62-MeV proton-induced reactions

Double-differential cross sections (d2σ/dΩdɛ) have been calculated and analyzed for triton production in proton-induced reactions on 27Al, 54,56Fe, 197Au, and 208Pb target nuclei at incident energy of 62 MeV. Calculations of double-differential cross sections have been performed using nuclear models implemented in the TALYS 1.2 code. The calculated results of the double-differential cross sections for triton emission have been compared with the existing experimental data.

Calculation of Double-Differential Cross Sections of n+7Li Reactions Below 20 MeV

A new reaction model for light nuclei is proposed to analyze the measured data, especially for analysis of the double-differential cross sections of the outgoing particles. Many channels are opened in the n+7Li reaction below En 20 MeV. The reaction mechanism is very complex, beside the sequential emissions there are also three-body breakup processes. Because of a strong recoil effect of light nucleus reactions, the energy balance is strictly taken into account. The comparisons of the calculated results with the double-differential measurements indicate that the model calculations are successful for the total outgoing neutrons.

Magnetically quantized continuum distorted waves.

A new derivation of continuum distorted-wave theory is presented. It is generalized to magnetically quantized continuum distorted waves. The context is analytic continuation of hydrogenic-state wave functions from below to above threshold, using parabolic coordinates and quantum numbers including m the magnetic quantum number. This continuation applies to excitation, charge transfer, ionization, and double and hybrid events for both light- and heavy-particle collisions. It is applied to the calculation of double-differential cross sections for the single ionization of the hydrogen atom and for a hydrogen molecule by a proton for electrons ejected in the forward direction at a collision energy of 50 keV and 100 keV respectively.