Coherent scattering of high-energy photons in a medium
نویسندگان
چکیده
منابع مشابه
Coherent scattering of high-energy photon in a medium
The coherent scattering of photon in the Coulomb field (the Delbrück scattering) is considered for the momentum transfer ∆ ≪ m in the frame of the quasiclassical operator method. In high-energy region this process occurs over rather long distance. The process amplitude is calculated taking into account the multiple scattering of particles of the intermediate electron-positron pair in a medium. ...
متن کاملScattering Lengths and Medium and High Energy ππ Scattering
Medium and high energy absorptive parts contribute to dispersive expressions for Dwave scattering lengths, a2 and a 2 2. For the model employed by Basdevant, Frogatt and Peterson we find the Dwave driving term contributions to the Dwave scattering lengths are 1.8 · 10−4 to a2 and 0.4 · 10 −4 to a2, roughly 10% and 30% of their respective central experimental values. Inequivalent sets of sum rul...
متن کاملThe scattering of Lyman-series photons in the intergalactic medium
We re-examine scattering of photons near the Lyα resonance in the intergalactic medium (IGM). We first derive a general integral solution for the radiation field around resonance when spin diffusivity is ignored. Our solution shows explicitly that recoil sources an absorption feature, whose magnitude increases with the relative importance of recoil compared to Doppler broadening. This spectrum ...
متن کاملfocus on communication in iranian high school language classes: a study of the role of teaching materials in changing the focus onto communication in language classes
چکیده ارتباط در کلاس به عوامل زیادی از جمله معلمان، دانش آموزان، برنامه های درسی و از همه مهم تر، مواد آموزشی وابسته است. در تدریس ارتباطی زبان که تاکید زیادی بر توانش ارتباطی دارد، کتاب درسی به عنوان عامل موثر بر پویایی کلاس محسوب میگردد که درس ها را از طریق فراهم آوردن متن ارتباط کلاسی و هم چنین نوع تمرین زبانی که دانش آموزان در طول فعالیت های کلاسی به آن مشغول اند، کنترل می کند. این حقیقت ک...
15 صفحه اولNon-linear pair production in scattering of photons on ultra-short laser pulses at high energy
Article history: Received 30 November 2009 Received in revised form 4 February 2010 Accepted 8 February 2010 Available online 11 February 2010 Editor: A. Ringwald
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 2001
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.63.116008