منابع مشابه
Multispecies pair annihilation reactions.
We consider diffusion-limited reactions A(i)+A(j)--> (1< or =i2 and d> or =2, we argue that the asymptotic density decay for such mutual annihilation processes with equal rates and initial densities is the same as for single-species pair annihilation A+A-->. In d=1, however, particle segregation occurs for all q< infinity. The total density decays accordi...
متن کاملSegregation in diffusion - limited multispecies pair annihilation
The kinetics of the q species pair annihilation reaction (A i + A j → ∅ for 1 ≤ i < j ≤ q) in d dimensions is studied by means of analytical considerations and Monte Carlo simulations. In the long-time regime the total particle density decays as ρ(t) ∼ t −α. For d = 1 the system segregates into single species domains, yielding a different value of α for each q; for a simplified version of the m...
متن کاملPion pair production in e + e − annihilation
We present an analysis of the process ee → γ orZ → ππγ, in the kinematical region where √ s, the c.m. energy of the ee pair, is large but much below the Z-pole. The subprocess γ orZ → ππγ can be described by the convolution of the hard scattering coefficient γ orZ → qq̄γ and the general distribution amplitude of two pions qq̄ → ππ. In the case of neutral pion, the production through γ is the domi...
متن کاملCyclically Coupled Spreading and Pair Annihilation
Recently it has been shown that the transition of the 1+1-dimensional annihilation-fission process 2X→3X, 2X→Ø exhibits an unusual type of nonequilibrium critical behavior. The phenomenological properties of critical clusters are characterized by two different dynamic modes for spreading and diffusion. In order to describe the interplay of these modes, we introduce an effective model which invo...
متن کاملThe pair production spectrum from photon-photon annihilation
We present the first completely analytical computationof the full differentialγ-γ pair production rate fromcompact radiation fields, exact to 2nd order QED, and use this result to investigate the validity of previously known approximations.
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 Letters
سال: 2002
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.89.250601