Light hypernuclei and hyperonnucleon interaction
Abstract
Light Hypernuclei are a vital testing ground for our understanding of the HyperonNucleon interaction. We have performed microscopic calculations of four and fivebody hypernuclei using the Nijmegen nucleonnucleon and hyperonnucleon interactions. Our calculations include explicit Sigma degrees of freedom. These degrees of freedom are quite important since, in contrast to the Delta minus N mass difference of approx. 300 MeV, the Sigma resonance is only about 80 MeV above the Lambda. In addition, although there is no onepionexchange in the Lambda N diagonal channel, this longestrange term does contribute to the transition Lambda N minus Sigma N interaction. Our variational calculations show that the A=4 spin 0 ground state binding energy is well reproduced by the Nijmegen HN integration, a oneboson exchange model fit to the available scattering data. The spin 1 excited state and the A=5 ground state are strongly underbound, however. We demonstrate the importance of the strong tensor terms of the Nijmegen model, particularly those in the transition channel, in obtaining this result. The limited data currently available for hyperonnucleon scattering must be greatly improved in order to place reasonable constraints on the interaction.
 Publication:

Presented at the Los Alamos Meson Physics Facility Workshop
 Pub Date:
 1990
 Bibcode:
 1990mpf..work...11C
 Keywords:

 Ground State;
 Hypernuclei;
 Nucleons;
 Particle Interactions;
 Scattering;
 Wave Functions;
 Computation;
 Degrees Of Freedom;
 Monte Carlo Method;
 Tensors;
 Variational Principles;
 Atomic and Molecular Physics