We review some recent arguments supporting the upgrade of the International Linear Collider by a polarized positron beam, in addition to the polarized electron beam. The examples presented here mainly focus on the impact of positron polarization on items relevant to new physics searches, such as the identification of novel interactions in fermion-pair production and the formulation of new CP-se...

Positronium (Ps) formation has been studied in high density polyethylene (HDPE) below and around gamma transition temperature (Tγ). The increase ortho-positronium (o-Ps) intensity (I3) with time due to trapped electrons at different rate discussed terms of possible models. Some calculation have performed find the thermal activation energy electrons.

Low-energy electron impact excitations of S2 molecules are studied using the fixedbond R-matrix method based on state-averaged complete active space SCF orbitals. Integral cross sections are calculated for elastic electron collision as well as impact excitation of the 7 lowest excited electronic states. Also, differential cross sections are obtained for elastic collision and excitation of the a...

A three-state calculation of electron-impact excitation of formaldehyde to the a ' A 2 and A ' A 2 states is carried out using the Schwinger multichannel variational method. The integral and differential cross sections so obtained agree fairly well with theoretical results obtained using the complex Kohn method. Though agreement between the calculated integral cross section and the single avail...

2014 A stepwise excitation of H2 is performed. Electron impact populates the metastable c 303A0u state then an optical resonance allows the excitation of 303A3g, 303A0g or 30394g states. We observed the selectivity of the electron impact excitation. The laser light used for the optical resonance was linearly polarized, the alignment produced allowed the observation of the Hanle effect on the 3 ...

The basic principles of positron annihilation physics are briefly discussed and the three most important experimental techniques used for bulk studies are described (i.e. positron lifetime, angular correlation, Doppler broadening). Several examples of the use of the positron methods are discussed for metals, ceramics and molecular materials, which illustrate the sensitivity of the positron anni...

Neuroimaging techniques have had a dramatic impact on the evaluation and treatment of patients with epilepsy. In order to take full advantage of their potential, it is important to place them in clinical and electrophysiological context and to understand their technical limitations. Positron emission tomography with 18F-2-deoxyglucose and single photon emission computed tomography can provide v...