搜索结果: 1-15 共查到“知识库 物理学 reaction”相关记录72条 . 查询时间(0.05 秒)
Opportunities to constrain astrophysical reaction rates for the s-process through determination of the ground state cross sections
nuclear reactions nucleosynthesis abundances
2011/7/21
Modern models of s-process nucleosynthesis in stars require stellar reaction rates with high precision. Most of the neutron capture cross sections in the s-process have been measured and for an increa...
Ultra-strong laser pulses: streak-camera for gamma-rays via pair production and quantum radiative reaction
gamma-rays zeptosecond pulses strong laser field electron-positron pair production radiation reaction
2011/8/5
Abstract: We show that a strong laser pulse combined with a strong x-ray pulse can be employed in a detection scheme for characterizing high-energy $\gamma$-ray pulses down to the zeptosecond timescal...
Mach-like emission from nucleon scattering in proton-nucleus reaction
nucleon scattering proton-nucleus reaction
2011/7/20
The fast-stage nucleon emission of proton-nucleus (pA) reactions from 300A MeV to 1.8A GeV has been investigated using the quantum molecular-dynamics model.
Nuclear reaction rates and the primordial nucleosynthesis
Early Universe Nuclear reaction rates Big-Bang Nucleosynthesis
2011/7/20
The theoretical predictions of the primordial abundances of elements in the big-bang nucleosynthesis (BBN) are dominated by uncertainties in the input nuclear reaction rates. We investigate the effect...
Atomic fragments from the nuclear reaction of the ${}^{6}$Li atom with slow neutrons
Atomic fragments the nuclear reaction Li atom slow neutrons
2011/8/5
Abstract: Approximate probabilities of formation of various atoms and ions in different bound states are determined for the exothermic nuclear $(n,{}^{6}$Li$;t,{}^{4}$He)-reaction of atomic lithium-6 ...
Mach-like emission from nucleon scattering in proton-nucleus reaction
Mach-like emission nucleon scattering proton-nucleus reaction
2011/7/21
The fast-stage nucleon emission of proton-nucleus (pA) reactions from 300A MeV to 1.8A GeV has been investigated using the quantum molecular-dynamics model. It is found that the sideward angular spect...
Recurrent host mobility in spatial epidemics: beyond reaction-diffusion
beyond reaction-diffusion spatial epidemics
2011/9/2
Human mobility is a key factor in spatial disease dynamics and related phenomena. In computational models host mobility is typically modeled by diffusion in space or onmetapolulation networks. Alterna...
Reaction-diffusion front crossing a local defect
Reaction-diffusion Mathematical Physics local defect
2011/7/26
Abstract: The interaction of a Zeldovich reaction-diffusion front with a localized defect is studied numerically and analytically. For the analysis, we start from conservation laws and develop simple ...
Study of the Reaction $np \rightarrow np \pi^+ \pi^-$ at Intermediate Energies
Study the Reaction $np \rightarrow np \pi^+ \pi^-$ Intermediate Energies
2011/4/6
Study of the Reaction $np \rightarrow np \pi^+ \pi^-$ at Intermediate Energies 。
Quantum Back-Reaction in Scale Invariant Induced Gravity
Quantum Back-Reaction Invariant Induced Gravity
2010/12/27
A quartic, self-interacting potential in the induced gravity framework is known to have a pure de Sitter attractor for the homogeneous mode. In order to obtain non-zero slow roll parameters we theref...
High-order quantum back-reaction and quantum cosmology with a positive cosmological constant
High-order quantum back-reaction quantum cosmology
2010/12/27
When quantum back-reaction by fluctuations, correlations and higher moments of a state becomes strong, semiclassical quantum mechanics resembles a dynamical system with a high-dimensional phase space....
High-energy break-up of 6Li as a tool to study the Big-Bang nucleosynthesis reaction 2H(alpha,gamma)6Li
High-energy break-up 6Li tool study the Big-Bang nucleosynthesis reaction 2H(alpha,gamma)6Li
2010/12/31
The recently claimed observations of non-negligible amounts of 6Li in old halo stars have renewed interest in the Big-Bang Nucleosynthesis (BBN) of 6Li. One important ingredient in the predicted BBN a...
Bond-specific reaction kinetics during the oxidation of (111) Si: Effect of n-type doping
Bond-specific reaction kinetics oxidation of (111) Si Effect of n-type doping
2010/11/24
It is known that a higher concentration of free carriers leads to a higher oxide growth rate in the thermal oxidation of silicon. However, the role of electrons and holes in oxidation chemistry is not...
Chiral Dynamics and Dubna-Mainz-Taipei Dynamical Model for Pion-Photoproduction Reaction
Chiral Dynamics Dubna-Mainz-Taipei Dynamical Model Pion-Photoproduction Reaction
2010/12/29
We demonstrate that the Dubna-Mainz-Taipei (DMT) meson-exchange dynamical model, which starts from an effective chiral Lagrangian, for pion photoproduction provides an excellent and economic framework...
A precise extraction of the induced polarization in the 4He(e,e'p)3H reaction
precise extraction the induced polarization the 4He(e,e'p)3H reaction
2010/12/29
We measured with unprecedented precision the induced polarization Py in 4He(e,e'p)3H at Q^2 = 0.8 (GeV/c)^2 and 1.3 (GeV/c)^2. The induced polarization is indicative of reaction-mechanism effects beyo...