Microscopic calculations of Λ single-particle energies

✍ Scribed by Q.N. Usmania; A.R. Bodmer

• Book ID: 104336943
• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 668 KB
• Volume: 639
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(98)00263-2

✦ Synopsis

A binding energy data for total baryon number A 5 208 and for A angular momenta C,, 5 3 are analyzed in terms of phenomenological (but generally consistent with mesonexchange) AN and ANN potentials.

The Fermi hypernetted chain technique is used to calculate the expectation values for the A binding to nuclear matter. Accurate effective AN and ANN potentials are obtained which are folded with the core-nucleus nucleon densities to calculate the A single-particle potential VA(r). We use a dispersive ANN potential but also include an explicit p dependence to allow for reduced repulsion in the surface, and the best fits have a large p dependence giving consistency with the variational Monte Carlo calculations for 5,He. The exchange fraction of the AN space-exchange potential is found to be 0.220.3 corresponding to rni N (0.74 -0.82)~~~. Charge-symmetry breaking is found to be significant for heavy hypernuclei with a large neutron excess, with a strength consistent with that obtained from the A = 4 hypernuclei.