S. Minami, T. Nakano, K. Nishijima, Hisaichiro Okonogi, Eiji Yamada,
... this paper, we try to interpret the pion-nucleon interaction on the basis of the nucleon isobar model. As a complementary way to the ... the future theory of fields. We treat the nucleon isobars as elementary particles and describe them by ... calculation of matrix elements of such processes involving nucleon isobars as the pion-proton scattering and the ... is applied only to pion reactions in one nucleon system, for we know too little about two or more nucleon systems to extract the pure pion-nucleon interaction. ...
Tópico(s): Superconducting Materials and Applications
1952 - Oxford University Press | Progress of Theoretical Physics
... is shown that the production of mesons and nucleons in very energetic nucleon-nucleon collisions depends essentially on the extent to which the observed rest mass of a nucleon is due to its meson field* and the ... field. The production of showers of mesons and nucleons is considered, assuming that a fraction ͼ of the observed rest mass of the nucleon is carried by the field, this rest mass ... f of distance from the centre of the nucleon. The remaining fraction of the rest mass is ... of radius ζ round the centre of the nucleon, this radius being of the order of the ...
Tópico(s): Nuclear physics research studies
1953 - Royal Society | Proceedings of the Royal Society of London A Mathematical and Physical Sciences
... multiplicities and charge distribution of mesons produced in nucleon-nucleon collisions. In deviating from a pure statistical model ... rules have been included, using results of meson-nucleon scattering experiments. Notably in the results the suppression ... the final state interactions by considering separately the nucleon-nucleon and meson-nucleon interactions, a separation made plausible by consideration of ... massive particles. Meson-meson interactions were neglected. The nucleon-nucleon interaction was taken care of by introducing ...
Tópico(s): Quantum Chromodynamics and Particle Interactions
1956 - American Institute of Physics | Physical Review
D. B. Lichtenberg, Marc Howard Ross,
... is made of the forces between hyperons and nucleons under the assumption that the forces are due ... be the same as the static-model pion-nucleon Hamiltonian except for differences in isotopic spin and ... made as those ordinarily made in evaluating the nucleon-nucleon potential, although it is noted that in case ... pion-baryon coupling constants are equal, the hyperon-nucleon potentials are just linear combinations of the observed nucleon-nucleon potentials. The pion-hyperon coupling constant is determined ...
Tópico(s): Nuclear Physics and Applications
1957 - American Institute of Physics | Physical Review
A calculation using the Chew theory indicates that nucleon-nucleon and pion-nucleon final-state interactions both play a role in contributing to the pion production cross sections in nucleon-nucleon collisions at energies near threshold. In particular, it ... 1) tensor forces lead to a $D$-wave nucleon-nucleon final state interaction or if (2) the pion and one of the nucleons is in a state of isotopic spin $\frac{ ...
Tópico(s): Quantum Chromodynamics and Particle Interactions
1957 - American Institute of Physics | Physical Review
Cross-sections for pion production in nucleon-nucleon collisions are calculated on the assumption that the production takes place into a few angular momentum states only, and that the matrix element ... for factors due to the final-state pion-nucleon and nucleon-nucleon interactions. The outgoing pion is assumed to be ... 2, 3/2) state with one of the nucleons. The angular momentum states introduced are compared with ... experiments bring out the importance of the pion-nucleon resonance. The cross-section for neutral pion production ...
Tópico(s): Particle physics theoretical and experimental studies
1958 - Royal Society | Proceedings of the Royal Society of London A Mathematical and Physical Sciences
Springer Link
... of protons by complex nuclei to that by nucleons is investigated quantitatively. No model of nuclear forces is used, but the nucleon-nucleon scattering is directly represented by phase shifts. The ... nucleus can be obtained by superposition of the nucleon-nucleon scattering amplitudes. For the purpose of this comparison, ... Mev). The spin-orbit potential agrees with the nucleon-nucleon data and with some, but not all, previous ... formula relates the Born approximation scattering to the nucleon-nucleon scattering. The expressions for the relevant amplitudes ...
Tópico(s): Quantum and Classical Electrodynamics
1958 - Elsevier BV | Annals of Physics
H. Kanada, Sinobu Nagata, Shoichiro Otsuki, Yoshio Sumi,
The nucleon-He4 elastic scattering at the incident energies from 0 to 40 MeV is investigated in relation to ... f-wave phase shifts are calculated by the nucleon-He4 interaction, that is constructed from an approximated Hamada and Johnston nucleon-nucleon potential. The differential cross section and the polarization ... the following results: All essential features of the nucleon-He4 scattering are explained in the energy region ... values of the d-wave phase shifts. The nucleon-He4 interaction depends drastically on the energy and ...
Tópico(s): Nuclear physics research studies
1963 - Oxford University Press | Progress of Theoretical Physics
The nucleon-nucleon problem is discussed from the standpoint of analyticity in angular momentum. A unique continuation of the partial-wave helicity amplitudes is given. The high-energy nucleon-nucleon problem is then considered from the point of ... that have the same quantum numbers as the nucleon-antinucleon channel. In particular, the contribution of these Regge trajectories to nucleon-antinucleon scattering and, hence, their contribution by crossing to nucleon-nucleon scattering is given. The resulting formulas should ...
Tópico(s): Superconducting Materials and Applications
1963 - American Institute of Physics | Physical Review
K. L. Kowalski, David Feldman,
... problems concerning the effects of the internal target nucleon motion and of the multiple scattering on the elastic scattering of high-energy nucleons by deuterons are considered. In order to provide ... multiple-scattering equations (when the number of target nucleons is small) which permits the exact treatment of ... study of the consequences of the internal target nucleon motion, the impulse approximation is used to express the complete nucleon-deuteron transition matrix element in terms of two-nucleon transition ($t$) matrices in the form of integrals ...
Tópico(s): Superconducting Materials and Applications
1963 - American Institute of Physics | Physical Review
Nobuo Yajima, S. Takagi, K. Kobayakawa,
... proposed. We discuss the possibilities to reduce the nucleon-nucleon collisions to pion-nucleon interactions. If we use the experimental data on ... p collision at 5 Gev as the pion-nucleon interaction, we can estimate the energy and angular ... ones and that the properties of the pion-nucleon interaction reduced from the nucleon-nucleon collision are similar to those of the pion-nucleon interaction actually observed. It is also suggested that the nucleon has a core whose radius is about a nucleon Compton wave length.
Tópico(s): Gamma-ray bursts and supernovae
1960 - Oxford University Press | Progress of Theoretical Physics
R. M. Sternheimer, S. J. Lindenbaum,
The isobaric nucleon model of pion production in nucleon-nucleon and pion-nucleon collisions has been extended to include the effect ... T=\frac{1}{2}$ state of the pion-nucleon system, in addition to the effect of the ...
Tópico(s): Quantum Chromodynamics and Particle Interactions
1961 - American Institute of Physics | Physical Review
L. Winsberg, Thomas P. Clements,
Direct nucleon-nucleon collisions play an important role in high-energy nuclear reactions. The importance of such collisions at lower energies ... we have analyzed the collisions between an incident nucleon and nucleons in a Fermi gas by means of the ... treatment given here is based on information from nucleon-nucleon scattering experiments. Collisions inside a nucleus are considered ... cross section, $〈\ensuremath{\sigma}〉$, between like and unlike nucleons is computed for incident energies from 10 Mev ... the Fermi energy. The properties of the struck nucleons in allowed collisions are also calculated. This information ...
Tópico(s): Quantum Chromodynamics and Particle Interactions
1961 - American Institute of Physics | Physical Review
Robert Karplus, Yoshio Yamaguchi,
The angular distribution for elastic nucleon-nucleon scattering at high energy is sharply peaked in the forward direction. As a consequence, there is an angular interval in nucleon-nucleus scattering to which successive small-angle elastic nucleon-bound nucleon scatterings are more likely to contribute than a single nucleon-bound nucleon scattering through the angle of observation. Such « plural » collisions result in outgoing nucleons which have suffered a smaller energy loss than nucleons that are scattered from hydrogen at the same ...
Tópico(s): earthquake and tectonic studies
1961 - Italian Physical Society | Il Nuovo Cimento
P. L. Jain, E. Lohrmann, M. Teucher,
... alpha}$-particle interactions of more than 7 Bev/nucleon have been found in a systematic way and ... measurements. At an average energy of 10 Bev/nucleon and 40 Bev/nucleon the average number of charged mesons produced by $\ ... 8.2, respectively. About one half of the nucleons of the $\ensuremath{\alpha}$ particle participate in the collision. The meson multiplicities per participating nucleon agree for proton and $\ensuremath{\alpha}$-particle collisions at 10 Bev/nucleon.We measured the angular distribution of the shower ...
Tópico(s): High-Energy Particle Collisions Research
1959 - American Institute of Physics | Physical Review
The experimental data of nucleon-nucleus collisions of energies around 100 GeV have been analysed. It is pointed out that the transverse momentum, p T , ... is also an adequate parameter to analyse the nucleon- nucleus collision. The transverse momenta, both in the ... distribution, are similar to the case of the nucleon-nucleon collision. Both the median angle and the average ... with high N h is effectively a single nucleon. Although conclusive evidence to reject the model of cascade development (of nucleon-nucleon and pion-nucleon collisions) is not presented, ...
Tópico(s): Earth Systems and Cosmic Evolution
1962 - Physical Society of Japan | Journal of the Physical Society of Japan
The low-energy scattering of two nucleons is studied within the framework of dispersion theory, using the Mandelstam representation. Certain ϱ-functions occur in the treatment of this problem ... potential approximation, the two-pion contribution to the nucleon-nucleon potential was evaluated. In the nucleon-nucleon potential, as calculated by Cottingham and Vinh Mau, ... amplitude data for the process 2π → NN. The nucleon-nucleon potentials so obtained in the various cases, such ... is included. In conclusion, we observe that the nucleon-nucleon potential we calculate agrees with that calculated ...
Tópico(s): Particle accelerators and beam dynamics
1967 - Elsevier BV | Nuclear Physics B
... account for all the important features of the nucleon-nucleon interaction. The method of dispersion relation is employed to calculate nucleon-nucleon phase shifts starting from the relativistic single-particle- ... short-range repulsive force.Two approaches to the nucleon-nucleon scattering problem were considered. (a) The meson model ... part (\ensuremath{\lesssim}0.3 F) of the nucleon-nucleon potential while the exchange of two pions in ...
Tópico(s): Atomic and Molecular Physics
1967 - American Physical Society | Reviews of Modern Physics
P. L. Pritchett, John Dirk Walecka,
... of oscillations of the meson field in the nucleon introduced in a previous paper is developed and ... framework for investigating the electromagnetic properties of the nucleon and gives an excitation spectrum similar to that observed for the nucleon. In this paper we discuss an improved variational ... can calculate all the electromagnetic properties of the nucleon on a consistent basis. We calculate the allowed ... form factors for all the levels of the nucleon up through 2850 MeV, and we compare with ... can compute the anomalous magnetic moment of the nucleon and the pion-nucleon coupling constant. We also ...
Tópico(s): Particle accelerators and beam dynamics
1968 - American Institute of Physics | Physical Review
A simple model of very-high-energy nucleon-nucleon interactions is constructed on the assumption that at sufficiently high energies the dominant processes can be described in terms of the production ... quantum numbers (except angular momentum) as the corresponding nucleons, and that the cross section for producing fireballs ... introduction of arbitrary parameters. Meson production multiplicities and nucleon inelasticity factors, which are derived from the fireball ... assumptions, are in accord with experimental observations of nucleon-nucleon interactions. This description of nucleon-nucleon interactions ...
Tópico(s): Radiation Therapy and Dosimetry
1968 - American Institute of Physics | Physical Review