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Robert M. Wright

Bio: Robert M. Wright is an academic researcher from Lawrence Livermore National Laboratory. The author has contributed to research in topics: Nucleon & Polarization (waves). The author has an hindex of 5, co-authored 7 publications receiving 568 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the phase shift energy dependence was investigated in a set of 839 data from 1 to 400 MeV scattering data and the most suitable form, form $A, gave the least-squares values for 30-and 23-parameter solutions.
Abstract: All of the available ($p,p$) scattering data from 1 to 400 MeV have been analyzed, and a self-consistent set of 839 data has been chosen. Using this data selection, we investigated a number of different forms for the phase-shift energy dependence. The correct number of free parameters to use with each form was studied. The most suitable form, form $A$, gave the least-squares values ${\ensuremath{\chi}}^{2}=810$ and ${\ensuremath{\chi}}^{2}=858$ for 30- and 23-parameter solutions, respectively. A subset of 588 data in six narrow energy bands was used to obtain single-energy solutions. It is shown that this subset contains most of the physical content of the full set of 839 data. The value ${g}^{2}=14.72\ifmmode\pm\else\textpm\fi{}0.83$ was obtained for the pion-nucleon coupling constant.

70 citations

Journal ArticleDOI
TL;DR: Several sets of energy-dependent pion-nucleon phase shifts have been obtained in the 0-350-MeV energy range as mentioned in this paper, and some very difficult experiments are suggested to distinguish among the solutions.
Abstract: Several sets of energy-dependent pion-nucleon phase shifts have been obtained in the 0-350-MeV energy range. These solutions differ near the end of the energy range and in the signs and magnitudes of some of the small phases. There is very little difference among these solutions in their prediction of the observables, including the spin-rotation parameters. Some very difficult experiments are suggested to distinguish among the solutions.

21 citations


Cited by
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Journal ArticleDOI
TL;DR: Hard (infinitely hard) and soft (Yukawa) core potentials have been fit to Yale and Livermore phase parameters and low-energy data as discussed by the authors, and it is found that neither the short-range behavior of the potentials nor the central-to-tensor ratio in the 3 S 1 - 3 D 1 state is well determined by the data.

1,818 citations

Book ChapterDOI
TL;DR: The purpose of this chapter is to review this “traditional” approach in the area of nuclear forces and their applications to nuclear structure.
Abstract: Nowadays it has become customary in nuclear physics to denote by “tradition” the approach that considers nucleons and mesons as the relevant degrees of freedom. It is the purpose of this chapter to review this “traditional” approach in the area of nuclear forces and their applications to nuclear structure.

1,049 citations

Journal ArticleDOI
K. Holinde1
TL;DR: In this paper, an explicit boson-exchange model for the nucleon-nucleon interaction including the δ-isobar is presented, and results for NN-scattering, the deuteron and nuclear matter.

343 citations

Journal ArticleDOI
TL;DR: In this paper, a review of nuclear reactions and nuclear elastic scattering in which the spin polarization of more than one of the reactants is measured is discussed and a considerable amount of space is devoted to the definitions of cartesian polarization transfer and spin correlation coefficients which are suitable for the description of reactions involving spin? and spin 1 particles.
Abstract: This review is concerned with nuclear reactions and nuclear elastic scattering in which the spin polarization of more than one of the reactants is measured. If both of the particles whose polarization is known are in the initial channel, or both in the final channel, we refer to a `spin correlation' experiment; if one polarized particle is in the initial and one is in the final channel, we refer to a `polarization transfer' experiment. We consider mainly particles with spin ? and with spin 1; to a minor extent higher spins are included. The state of the art with respect to the production of polarized beams and targets and with respect to polarization analysing devices is briefly reviewed. A considerable amount of space is devoted to the definitions of cartesian polarization transfer and spin correlation coefficients which are suitable for the description of reactions involving spin ? and spin 1 particles. These parameters are generalizations of the triple scattering and spin correlation parameters introduced by Wolfenstein for a description of nucleon-nucleon scattering. Finally, the experiments of these types so far performed are reviewed. Reactions involving photons are excluded, and the nucleon-nucleon problem is only briefly mentioned. This review was completed in March 1972.

296 citations

Journal ArticleDOI
TL;DR: In this paper, a method for solving the Schrodinger equation for the ground state of any number of bosons or for the trinucleon system or α-particle is formulated in the framework of the hyperspherical harmonic expansion method.

242 citations