Speaker
Avraham Gal
(Racah Institute of Physics, The Hebrew University)
Description
Two-body hyperon-nucleon interaction models often assume additional 3-body $\Lambda NN$ terms to reproduce the empirically derived value of $D = 30$ MeV for the $\Lambda$-nucleus potential depth. There is no consensus yet on the sign and size of such 3-body terms. Applying consistently a density-dependent $\Lambda$-nucleus optical potential to binding energy calculations of observed $1s$ and $1p$ states in the mass range $A = 12-208$, we constrain the $\Lambda NN$ contribution to $D$ by $14 \pm 2$ MeV repulsion at symmetric nuclear matter density $0.17 {\rm fm}^{-3}$ [1] in rough agreement with some theoretical models.
[1] E. Friedman, A. Gal, in preparation (03/2022).
Primary authors
Avraham Gal
(Racah Institute of Physics, The Hebrew University)
Eliahu Friedman
(Racah Institute of Physics, The Hebrew University)
