R. A. M. Klomp

Construction of high-quality NN potential models

We present an updated version (Nijm93) of the Nijmegen soft-core potential, which gives a much better description of the np data than the older version (Nijm78). The chi^2 per datum is 1.87. The configuration-space and momentum-space versions of this potential are exactly equivalent; a unique feature among meson-theoretical potentials. We also present three new NN potential models: a non-local Reid-like Nijmegen potential (NijmI), a local version (NijmII), and an updated regularized version (Reid93) of the Reid soft-core potential. These three potentials all have a nearly optimal chi^2 per datum and can therefore be considered as alternative partial-wave analyses. All potentials contain the proper charge-dependent one-pion-exchange tail. Fortran code for the potentials can be obtained via anonymous ftp from this http URL

Construction of high-quality Nucleon-Nucleon potential models

We present an updated version (Nijm93) of the Nijmegen soft-core potential, which gives a much better description of the np data than the older version (Nijm78). The chi^2 per datum is 1.87. The configuration-space and momentum-space versions of this potential are exactly equivalent; a unique feature among meson-theoretical potentials. We also present three new NN potential models: a non-local Reid-like Nijmegen potential (NijmI), a local version (NijmII), and an updated regularized version (Reid93) of the Reid soft-core potential. These three potentials all have a nearly optimal chi^2 per datum and can therefore be considered as alternative partial-wave analyses. All potentials contain the proper charge-dependent one-pion-exchange tail. Fortran code for the potentials can be obtained via anonymous ftp from this http URL

The Nijmegen NN phase shift analyses

Abstract The Nijmegen group has now completed the phase shift analysis of all pp scattering data below Tlab = 350 MeV. This is a continuation of the Nijmegen 0–30 MeV analysis. Both in the pp and the np analysis, a low value for the πNN coupling constant g02 was found, indicating a large charge independence breaking. In this contribution we report on the present status of the Nijmegen phase shift analysis. The incorporation of the magnetic-moment interaction proved to be important and changed the numerical results. We find now for the ppπ0 coupling constant g02 = 13.53 ± 0.14. Some comments are made on the possible CIB sources.

The Nijmegen Potentials

A review is given of the various Nijmegen potentials. Special attention is given to some of the newest developments, such as the extended soft-core model, the high-quality potentials, and the Nijmegen optical potentials for NN.

COMMENT ON: PI NN COUPLING FROM HIGH PRECISION NP CHARGE EXCHANGE AT 162 MEV. AUTHORS' REPLY

In this updated and expanded version of our delayed Comment we show that the np backward cross section, as presented by the Uppsala group, is seriously flawed (more than 25 sd.). The main reason is the incorrect normalization of the data. We show also that their extrapolation method, used to determine the charged piNN coupling constant, is a factor of about 10 less accurate than claimed by Ericson et al. The large extrapolation error makes the determination of the coupling constant by the Uppsala group totally uninteresting.

Partial wave analyses of the pp data alone and of the np data alone

We present results of the Nijmegen partial‐wave analyses of all NN scattering data below Tlab=500 MeV. We have been able to extract for the first time the important np phase shifts for both I=0 and I=1 from the np scattering data alone. This allows us to study the charge independence breaking between the pp and np I=1 phases. In our analyses we obtain for the pp data χ2min/Ndf=1.13 and for the np data χ2minNdf=1.12.

A New Partial Wave Analysis and the Nucleon-Nucleon Interaction

We present some recent results of the Nijmegen partial-wave analysis of all NN scattering data below T lab = 350 MeV. We compare the predictions of various NN potential models with the NN scattering data and with the phase parameters at 50 MeV.

Soft-Core OBE-Potentials in Momentum Space

The partial wave projection of the Nijmegen soft-core potential model in momentum space is presented. The given formulas are quite general and apply to NN and YN as well. Moreover, as an important future application, the Nijmegen phase shift analysis can be made available to momentum space computations through the momentum space transcription of a Reid-like potential based on soft-core potential functions. Results are shown grafically in three-dimensional plots for various partial waves in the case of NN. Typeset using REVTEX 1