Preliminary Differential Cross Sections Research Articles

Electron collisions with constituents of planetary atmospheres

Collisions between electrons and neutral species play an important role in the energy balance of upper atmospheres throughout the Solar System. These processes, and the subsequent photon emissions produced, provide one of the primary means for probing, diagnosing and understanding the dynamics of these environments. Modelling of these plasmas and interpretation of optical observations requires accurate knowledge of atomic/molecular parameters such as oscillator strengths and predissociation yields along with cross sections for electron impact excitation (and emission) with the constituent species of these atmospheres. In this paper, our recent work involving electron collisions with two of the most important atmospheric species in our Solar System, namely N2 and H2, will be reviewed. Preliminary differential cross sections for excitation of the B 1Σ+u and C 1Πu states out of the X 1Σg+(v′′ = 1) ground state level of H2 are presented.

Study of three-nucleon force effects in [formula omitted] break-up with BINA

Extensive studies of three-nucleon force (3NF) effects in elastic proton-deuteron scattering have been performed at KVI and elsewhere in the past. In the present work, we explored 3NF effects in the break-up scattering process by performing high precision measurement of vector analyzing powers and differential cross sections using a 190 MeV polarized-proton beam on a liquid deuterium target. The experiment was performed by exploiting a new detector called Big Instrument for Nuclear-polarization Analysis, BINA. Its unique design enables coverage of almost the complete reaction phase space. Preliminary differential cross sections and vector analyzing powers are presented and results are compared with state-of-the-art three-nucleon calculations.

$\pi\pi$ correlations in $\gamma + A$ reactions

Preliminary differential cross-sections of the reactions $A(\gamma,\pi^{0}\pi^{0})$ and $A(\gamma,\pi^{0}\pi^ + + \pi^{0}\pi^-)$ with A = 1 H, 12 C, and nat Pb are presented. A significant nuclear-mass dependence of the $\pi\pi$ invariant-mass distribution is found in the $\pi^{0}\pi^{0}$ channel. The dependence is not observed in the $\pi^{0}\pi^{\pm}$ channel. The in-medium observation in the $\pi^{0}\pi^{0}$ channel is consistent with an in-medium modification of the $\pi\pi$ interaction in the I = J = 0 channel, changing width and pole position of a $\pi\pi$ resonant state.