نتایج جستجو برای: high energy photon beam
تعداد نتایج: 2686543 فیلتر نتایج به سال:
introduction: scatter radiation is one of the major sources of error in nuclear medicine data processing. different methods of scatter correction have been introduced in order to improve the quality of data. however the best method is to avoid recording of scatter photons in acquisition. the only difference between scattered and non-scattered photons is the energy. pulse height analyzer is the ...
We propose to measure the spin-dependent total cross section for circularly polarized photons absorbed on longitudinally polarized protons and neutrons in the photon energy range 2.5 < k < 5.5 GeV. This will be the first measurement of the difference between leftand right-handed polarized photoproduction above the resonance region. These data are needed to learn about the high energy convergenc...
The SLAC electron-positron colliding beam facility and its associated magnetic detector facility are described. General experimental problems in performing photon-photon collision experiments at SPEAR and the proposed experiment of Masek et al. are discussed. -e (Talk presented at the International Colloquium on Photon-Photon Collisions in Electron-Positron Storage Rings, Paris, Sept. 3-4, 1973...
The level of photon beam stability required to meet measurement resolution goals varies from experiment to experiment, depending on experiment-specific photon phase space acceptance aperture and the sensitivity of measurement to electron beam motion within its 6-D phase space. Stability time scales range from hours to microseconds, depending on experiment sampling rate, data integration period ...
The advent of a next linear e ± e − collider and back-scatterd laser beams will allow the study of a vast array of high energy processes of the Standard Model through the fusion of real and virtual photons and other gauge bosons. As examples, I discuss virtual photon scattering γ * γ * → X in the region dominated by BFKL hard Pomeron exchange and report the predicted cross sections at present a...
We present the multiplicity and pseudorapidity distributions of photons produced in Au+Au and Cu+Cu collisions at √ sNN = 62.4 and 200 GeV. The photons are measured in the region −3.7 < η < −2.3 using the photon multiplicity detector in the STAR experiment at RHIC. The number of photons produced per average number of participating nucleon pairs increases with the beam energy and is independent ...
M.W. Ahmed, C.W. Arnold, T. Averett, J.P Chen J.R. Calarco, T. Clegg, D. Dutta, H. Gao (Spokesperson), C. Howell, M. Huang,H. Karwowski, G. Laskaris, A. Nathan, X. Qian, H.R. Weller, Y. Wu, Q. Ye, Q.J. Ye, A. Young, W.Z. Zheng Duke University 2 University of North Carolina, Chapel Hill College of William & Mary Thomas Jefferson Lab National Accelerator Facility, Newport News, VA 5 University of...
X-ray photon beam from a SASE FEL undulator is in principle a single user tool, just like an optical laser. Therefore, the operation and amortization cost cannot be easily spread over many simultaneous experiments. To avoid prohibitive cost for each experiment, a new XFEL laboratory scheme is proposed. The wavelength range 0.1-1.6 nm at fixed electron energy of 15 GeV can be covered by operatin...
One of the most powerful tools to investigate the internal structure of quasi real photons is the measurement of photon structure functions in deep inelastic electron photon scattering at ee colliders. These measurements have by now a tradition of sixteen years since the first F γ 2 was obtained by PLUTO [1]. The LEP accelerator is a unique place for the measurements of photon structure functio...
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