Now showing items 161-170 of 196
Cosmic ray results on the A dependence of multiplicity and angular distributions in proton nuclear interactions above 100 GeV
(Elsevier, 1975-01-06)
A calorimeter-spark chamber system was used to collect data on several hundred proton-nucleus interactions above 100 GeV using targets of C, Al, Fe, Sn and Pb. The average charged prong multiplicity is found to depend on ...
On the quantum langevin equation
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1987-03)
The quantum Langevin equation is the Heisenberg equation of motion for the (operator) coordinate of a Brownian particle coupled to a heat bath. We give an elementary derivation of this equation for a simple coupled-oscillator ...
Analytical solution of an irreversible surface reaction model
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1991-12)
In this work, we consider a simple model of reaction-limited annihilation A + B → 0 with a random source and desorption in the spirit of the reaction model proposed by Fitchthorn, Ziff, and Gulari, and we solve it exactly ...
The diffusion-limited reaction A+B→0 on a fractal substrate
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1991-12)
We show in this paper how the segregation of reactants in the diffusion-limited reaction A+B→0 on a fractal substrate arises. For spectral dimensions d s ⩽ 2 we obtain segregation controlled by the source and/or the intrinsic ...
Isobaric analog states of neutron-rich nuclei. Doppler shift as a measurement tool for resonance excitation functions
(Società Italiana di Fisica; Società Italiana di Fisica and Springer-Verlag, 2005-09)
We present a new approach for the measurement of resonance excitation functions of neutron-rich nuclei using Doppler shift information. Preliminary data from the first application of the method is presented in the spectroscopy ...
High energy isospin breaking in technicolor theories
(Elsevier, 1989-11-30)
Within technicolor theories, we explore the impact of four-fermion interactions on the fermion mass splittings via explicit breaking of the custodial SU(2)R symmetry. Assuming they do not lead tounacceptably large ...
New NNLL QCD results on the decay B → X s ℓ + ℓ –
(Springer-Verlag; Società Italiana di Fisica, Springer-Verlag, 2004-07)
We present here new NNLL predictions on the inclusive rare decay B → X s ℓ + ℓ – based on our new two-loop QCD analysis of the four-quark operators.
A family of strings with spin
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1996-01)
Using an equivalence theorem, we discuss some stationary interiors for a string with spin density in a space with torsion. We show that there is a family of solutions characterized by the spin divergences and compare the ...
Signal mixing in a ratchet device: commensurability and current control
(Springer-Verlag; EDP Sciences, Società Italiana di Fisica, and Springer-Verlag, 2004-08)
Rectification current in overdamped ratchets can be easily controlled by applying two driving signals and tuning either their relative phase or their frequency ratio. The interplay of the two inputs generates intriguing ...
Space-charge layers in semi-insulating GaAs: Photoexcited two-dimensional electron systems
(Elsevier, 1985)
Resonant Raman spectra of photoexcited semi-insulating GaAs and Fe/GaAs show features characteristic of two-dimensional electron plasmas. The results are ascribed to the presence of a space-charge layer at the surface, ...