Charge asymmetry and neutron-neutron scattering

C. W. Wong, S. K. Young, K. F. Liu

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The uncertainty in the subtraction of electromagnetic effects from S-wave proton-proton scattering potentials is studied in two models using unitarily transformed potentials. Restrictions on these models caused by theoretical, off-shell and deuteron constraints are imposed. The probable uncertainty of physical interest is found to be small. It is typically only a few parts per thousand of the one-pion exchange potential. It has relatively little effect on Coulomb displacement energies. Phenomenological charge-symmetry-breaking potentials are constructed which both fit the experimental neutron-neutron (nn) scattering length (-16.4 fm). and give roughly the needed Coulomb displacement energies. These phenomenological potentials are found to contain a short-range repulsion and a strong long-range attraction for a neutron pair. The need for experimental information on the shape and state dependence of the nn force is emphasized. These can probably be obtained from precise nn scattering measurements.

Original languageEnglish
Pages (from-to)96-124
Number of pages29
JournalNuclear Physics, Section A
Issue number1
StatePublished - Nov 17 1975

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Dive into the research topics of 'Charge asymmetry and neutron-neutron scattering'. Together they form a unique fingerprint.

Cite this