Exploring the neutron skin by hyperon-antihyperon production in antiproton-nucleus interactions

In this work we propose a new method to measure the evolution of the neutron skin thickness between different isotopes. We consider antiproton-nucleus interactions close to the production threshold of $\mathrm{\Lambda }\bar{\mathrm{\Lambda }}$ and $\mathrm{\Sigma }\bar{\mathrm{\Lambda }}$ pairs. At low energies, $\mathrm{\Lambda }\bar{\mathrm{\Lambda }}$ pairs are produced in p + p collisions, while $\mathrm{\Sigma }\bar{\mathrm{\Lambda }}$ pairs can only be produced in p + n interactions. Measuring these cross sections provides information on the neutron skin thickness