Results 311 to 320 of about 1,453,193 (347)

When Is a Proton Not a Proton?

Chemistry - A European Journal, 1998
In spite of the large number of protonated complexes, their use in catalytic cycles has been little explored. The existing examples suggest that catalytic processes initiated by the protonation of a low-valent metal hold promise for the development of selective, efficient, and atom-economical addition reactions under very mild conditions, if the ...
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The scattering of protons by protons and the meson field of the proton

Physica, 1948
Abstract New calculations are made on the scattering of protons by protons with several values of the potential energy of the proton, this energy being assumed to be the meson potential. The results of these calculations are compared with the available experimental material.
J.K Lubański, C De Jager
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Proton-proton bremsstrahlung with polarized protons

2008
The asymmetry in proton-proton bremsstrahlung is given for a variety of kinematic conditions in the soft photon approximation. It is argued that the asymmetry may be more sensitive to the unknown higher-order terms than the cross section and is shown that several models giving similar cross sections give quite different asymmetries, which could thus be
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Noncoplanarity in proton-proton bremsstrahlung

Physical Review C, 2001
Using the soft-photon approximation, we address the issue of the importance of noncoplanarity effects in proton-proton bremsstrahlung, We investigate the noncoplanar cross section as a function of the noncoplanarity angle (φ) over bar for the entire range of the photon polar angle psi(gamma).
B. F. Gibson, M.K. Liou, Yang Li, Robertus Timmermans   +3 more
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Collective proton transport with weak proton-proton coupling

Physical Review E, 2000
A mechanism based on the peculiar dynamical properties of the hydrogen bond is suggested to describe fast proton transfers in hydrogen-bonded chains with realistic (weak) intersite proton-proton interactions. For this purpose, a two-sublattice model is suggested and studied analytically that admits an exact soliton solution.
A. V. Zolotaryuk, Karl H. Spatschek, Michel Peyrard   +2 more
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Theory of Proton-Proton Bremsstrahlung

Physical Review, 1966
The proton-proton bremsstrahlung cross section is derived to first order in the electromagnetic interaction and the nucleon-nucleon $t$ matrix. The cross section is expressed in terms of the nucleon-nucleon phase shifts and the quasi-phase parameters needed to describe $t$ off the energy shell. The formulas are given in a form suitable for calculation.
M.I. Sobel, Alan H. Cromer
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Proton–proton correlations observed in two-proton radioactivity of 94Ag

Nature, 2006
The stability and spontaneous decay of naturally occurring atomic nuclei have been much studied ever since Becquerel discovered natural radioactivity in 1896. In 1960, proton-rich nuclei with an odd or an even atomic number Z were predicted to decay through one- and two-proton radioactivity, respectively.
H. Grawe, Marco La Commara, Mark Huyse, L. V. Grigorenko, Ivan Mukha, R. Kirchner, Z. Janas, Chiara Mazzocchi, E. Roeckl, L. Batist, Sam L Tabor, Piet Van Duppen, Andrey Blazhev, Andrey Blazhev, Joachim Döring   +14 more
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Theory of Scattering of Protons by Protons

Physical Review, 1936
The experiments of Tuve, Heydenburg and Hafstad and those of White are discussed by means of the standard theory of scattering in central fields. The theoretical formulas are presented in a form convenient for numerical computation and are supplemented by tables.
Edward U. Condon, R. D. Present, G. Breit   +2 more
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Proton-Proton Collisions

2016
This chapter is intended to give an overview of the basics of the description and simulation of proton-proton (pp) collisions. The terminology is introduced in Sect. 4.1. Section 4.2 contains a brief discussion of parton density functions and Sect. 4.3 introduces the basic concepts for the calculation of hadron–hadron cross sections.
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The external proton beams and the proton‐proton experiments

AIP Conference Proceedings, 1980
The ZGS was one of the first accelerators in which extracted primary proton beams and experimental halls were part of the initial design. Special features incorporated into the ring made it possible to permanently position extraction magnets, and there was no need to plunge them as in other machines.
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