Local phenomenological nucleon-nucleon potentials

The Bonn Meson Exchange Model for the Nucleon Nucleon Interaction

The question of parity conservation in β decays and in hyperon and meson decays is examined. Possible experiments are suggested which might test parity conservation in these interactions.

https://link.aps.org/pdf/10.1103/PhysRev.104.254

Question of Parity Conservation in Weak Interactions

We present a charge-dependent one-boson-exchange nucleon-nucleon $(\mathrm{NN})$ potential that fits the world proton-proton data below 350 MeV available in the year 2000 with a ${\ensuremath{\chi}}^{2}$ per datum of 1.01 for 2932 data and the corresponding neutron-proton data with ${\ensuremath{\chi}}^{2}/\mathrm{datum}$ $=1.02$ for 3058 data. This reproduction of the $\mathrm{NN}$ data is more accurate than by any phase-shift analysis and any other $\mathrm{NN}$ potential. This is achieved by the introduction of two effective $\ensuremath{\sigma}$ mesons the parameters of which are partial-wave dependent. The charge dependence of the present potential (which we call ``CD-Bonn'') is based upon the predictions by the Bonn full model for charge symmetry and charge-independence breaking in all partial waves with $Jl~4.$ The potential is represented in terms of the covariant Feynman amplitudes for one-boson exchange which are nonlocal. Therefore, the off-shell behavior of the CD-Bonn potential differs in a characteristic way from commonly used local potentials and leads to larger binding energies in nuclear few- and many-body systems, where underbinding is a persistent problem.

/pdf/the-high-precision-charge-dependent-bonn-nucleon-nucleon-4cw0m6d4ar.pdf

The High precision, charge dependent Bonn nucleon-nucleon potential (CD-Bonn)

Hadron-hadron (h-h) collisions at high energies are investigated in the ultra-relativistic quantum molecular dynamics (UrQMD) approach. This microscopic transport model describes the phenomenology of hadronic interactions at low and intermediate energies ( 5 GeV, the excitation of colour strings and their subsequent fragmentation into hadrons dominates the multiple production of particles in the UrQMD model. The model shows a fair overall agreement with a large body of experimental h-h data over a wide range of h-h centre-of-mass energies. Hadronic reaction data with higher precision would be useful to support the use of the UrQMD model for relativistic heavy-ion collisions.

https://iopscience.iop.org/article/10.1088/0954-3899/25/9/308/pdf

Relativistic hadron-hadron collisions in the ultra-relativistic quantum molecular dynamics model

The results of a phase-shift analysis of proton-proton cross-section, polarization, and triple-scattering experiments at \ensuremath{\sim}310 Mev are reported. From an extensive search five satisfactory solutions have been found. Three additional solutions that give fair fits to the data are also reported.

Phase shift analysis of 310-MeV proton proton scattering experiments

One of the striking features of Dirac's theory of the electron was the appearance of solutions to his equations which required the existence of an antiparticle, later identified as the positron.

/pdf/observation-of-antiprotons-4msjaxitet.pdf

Observation of antiprotons

In this paper we describe experiments with high-energy polarized protons, (\ensuremath{\sim}315 Mev), their production, and their scattering from complex nuclei. We give the essentials of the theory of polarization of particles of spin \textonehalf{} in a form suitable for the interpretation of the experimental results. Included is a detailed description of the experimental techniques, the characteristics of the polarized beam, and a discussion of the errors of measurement. The beam was 76% polarized and the maximum beam current was approximately ${10}^{5}$ protons per second. Results of the scattering experiments on beryllium, carbon, aluminum, calcium, iron, and tantalum are described. Some results of triple-scattering experiments, which further determine the scattering matrix, are also given. The relation of the experimental results to the various theories proposed for explaining the polarization by scattering is discussed. Only qualitative agreement with the theoretical studies made on current models is achieved. Although many of the features predicted by the usual types of potentials are present, no single potential can account for all the observed facts.

/pdf/experiments-with-315-mev-polarized-protons-i-elastic-2hxagpptr9.pdf

Experiments with 315-Mev Polarized Protons. I. Elastic Scattering by Complex Nuclei

Radiation Laboretory, i)epa*ment of h y s i o 8 , Fniversity o f S ~ l f f a r s i a Berkeley, California beams and their scattering properties. We also have bean mattering protons i n the Berkeley oyclotron and investigating t h e i r p o l ~ r i e a t i o a by double rroattttring experilnrenta and we wish to give at this time a progress report b o a u s e the deta so far oolleated appear o f intereat. The beam i s p o l a r i m d by soattering on target A of baryllSuxn or oarbon (Pig. 1) and is d e l l e o t e d by a steering = p e t experimcntd area (uave). into the s h i e l b d The angle of scattaringu/ in a horizont~lplane m d at target A varies betamen 17O m l 20O 'in different experiments. c The energy Eo of t h e p r i m r y beam is 340 WV* The scattered barn, Follms rsrn o r b i t as drawn in Fig. 1 and i t a energy is approximately E o w s 2 W y c if it imderrrsnt an w e, elastic sootkering on rs. free nucleon. E it3 measured by t a g s determina- tion* The following experiments show t h a t the beam bedt;men targets A and B i s polaricedr angle A second scatterer E, i n the aava, rsuatters the barn by aa To o o n p l e t s l y d e f i n e the d i r e c t i o n o f the a o ~ t t s r e d beam we

/pdf/experiments-with-high-energy-polarized-protons-1remb43gxj.pdf

Experiments with High-Energy Polarized Protons

The neutron detection efficiency of plastic scintillator counters 15 cm thick has been determined for neutron energies from 4 to 76 Mev. Neutrons in this energy range were obtained by scattering a 205‐Mev neutron beam from a hydrogen target. A proton‐range telescope selected the forward‐scattered protons from the n‐p reaction, thus monitoring the flux of monoenergetic neutrons scattered in a prescribed direction. Near 10 Mev the efficiency is 30%, and it slowly decreases to 20% at 76 Mev.

/pdf/detection-efficiency-of-plastic-scintillator-for-neutron-4jt9zh2b82.pdf

Detection Efficiency of Plastic Scintillator for Neutron Energies 4 to 76 Mev

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