Results 261 to 270 of about 1,648,148 (309)

Are Mesons Elementary Particles?

Physical Review, 1949
The hypothesis that $\ensuremath{\pi}$-mesons may be composite particles formed by the association of a nucleon with an anti-nucleon is discussed. From an extremely crude discussion of the model it appears that such a meson would have in most respects properties similar to those of the meson of the Yukawa theory.
Fermi, E., Yang, C. N.
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Elementary particles

Journal of the Franklin Institute, 1967
Elementary particles are marvelous bits of matter out of which the whole universe is made, including us; each one exhibits everywhere the same properties, whether in the laboratory or in distant galaxies. We know that there are a number of different kinds of these elementary bits of matter interacting and transforming into one another under the ...
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Elementary and Composite Particles

Physical Review, 1961
It is shown for two simple fixed-source theories with one stable excited state of the source that (1) a knowledge of the physical $S$-matrix elements of the theory is sufficient to decide if the state is associated with an elementary particle or a composite particle, and (2) the theory in which the particle is composite corresponds to the elementary ...
Vaughn, M. T., Aaron, Ronald, Amado, Ralph D.   +2 more
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Elementary Particles

Physics Today, 1960
The urge and the interest to find those ultimate elements in terms of which everything else is made of are almost as old as the human civilization. However, as our knowledge increases what were thought to be elementary may turn out to be composites. Consequently, the class of these supposedly fundamental elements changes with time.
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The nature of elementary particles

Physics Today, 1976
The question, “What is an elementary particle?” must find its answer primarily in experiment, although it must also be confronted with philosphical considerations. I will therefore begin by giving a short survey of the important experimental results of the last fifty years.
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Spacetime of the Elementary Particles

Journal of Mathematical Physics, 1960
The possibility is examined that physical space is characterized by a torsion, or an asymmetric connection, which is determined by the matter field. There exists a space with uniform torsion with the same metrical properties as conventional microspace; it is isotropic and homogeneous with a very large radius of curvature (R≅1028 cm).
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Molecules and elementary particles

Biosystems, 1977
A new field theory based on a generalization of Einstein's general theory of relativity is briefly discussed and some of its predictions and their comparisons with recent experiments are presented.
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Theory of Elementary Particles

Science, 1955
It is obvious that at the present state of our knowledge it would be hopeless to try to find the correct theory of the elementary particles. On the other hand, one may try to form some kind of picture of how such a future theory of elementary particles will look, because, even if we realize that we know only very few details about the elementary ...
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Elementary Particles at Rest

Physical Review, 1952
The object of this paper is to present a theory of the structure of elementary particles at rest. Some applications are included; in particular a solution to an unsolved problem in astronomy is presented.
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Elementary Particles and the Principle of Reciprocity

Nature, 1949
THE discovery of different kinds of mesons with rest-masses spreading over a considerable range has brought about a fundamental change in the aspect of the problem of elementary particles. It looks as if there exists a great many, possibly an infinite number of particles with different rest-masses, most of them being unstable, while a few have a long ...
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