The beam charge asymmetry helps to isolate the real part of the deeply virtual Compton scattering (DVCS) amplitude. It is discussed what information can be gained both from the real and imaginary part of the DVCS amplitude. INTRODUCTION Form factors are the coherent amplitude that the nucleon remains intact when one of its quarks absorbs a certain momentum transfer ∆μ . In this amplitude, the c...

QED Compton scattering at HERA is discussed in terms of the information it may reveal on the proton structure at low momentum transfers Q. Detailed Monte Carlo studies are performed which show that the analysis of inelastic QED Compton events allows the extension of present HERA structure function measurements to a kinematic regime, which up to now was only accessed in fixed target data. For th...

We study synchrotron self-inverse Compton radiation from a reverse shock fireball. If the inverse Compton process dominates the cooling of shocked electrons, an X-ray flare produced by the first-order Compton scattering would emerge in the very early afterglow phase, with the bulk of the shock energy radiated in the second-order scattering component at 10–100MeV. The dominance of inverse Compto...

transition matrix in 3D Electronically Collimated SPECT Anne C. Sauve1, Alfred O. Hero1, W. Leslie Rogers2 and Neal H. Clinthorne2 January 15, 1997 Abstract In this paper we will present numerical studies of the performance of a 3D Compton camera being developed at the University of Michigan. We present a physical model of the camera which exploits symmetries and an adapted spatial sampling pat...

Leung, Chan & Chu (2004) claimed that a previously neglected reheating effect makes a small but noticeable change to the process of cosmological recombination. We revisit this effect by considering a system consisting of both radiation and ionizing gas under adiabatic expansion. In the thermal equilibrium limit, due to the huge radiation background, only a fraction about 10 of the heat released...

We use the recent deuteron Compton data to evaluate the J=O fixed pole in neutron Compton scattering. This calculation includes the effects of both Glauber and Fermi motion corrections in the extraction of the free neutron cross section from the deuteron data, The result is consistent with the Born answer, zero.’ As a by-product, we show that the f:A2 ratio in Compton scattering is much larger ...

The process of the energy interchange between radiation and matter provided by Compton scattering is relevant in many areas of physics. For example, in cosmology it keeps the matter at the same temperature as radiation [1]. Compton scattering is also a unique spectroscopy for condensed-matter physics, which has acquired greater importance with the advent of modern synchrotron sources [2–4]. For...

Compton scattering (γ+p → γ+p) in the hard scattering limit is a potentially powerful probe of the short-distance structure of the nucleon. It is a natural complement to high Q exclusive reactions, such as elastic form factors and deeply virtual Compton scattering (DVCS), where the common feature is a hard energy scale, leading to a factorization of the transition amplitude into a part involvin...

A phoswich detector with two scintillation layers has been designed and assembled at Oregon State University. This detector is able to identify and reject Compton events and ultimately reduce the Compton continuum in gamma energy spectra. In this detector, CsI(Tl) crystal is used to primarily detect photoelectric events. The CsI(Tl) crystal is partially surrounded by a BGO crystal layer to capt...