Probing small neutron skin variations in isotope pairs by hyperon-antihyperon production in antiproton--nucleus interactions

Abstract

We propose a new method to study the evolution of the neutron periphery between different isotopes by considering antiproton--nucleus interactions close to the production threshold of $\Lambda \overline{\Lambda }$ and ${\Sigma }^{-}\overline{\Lambda }$ pairs. At low energies, $\Lambda \overline{\Lambda }$ pairs are produced in $\overline{\text{p}}+\text{p}$ collisions, while ${\Sigma }^{-}\overline{\Lambda }$ pairs can only be produced in $\overline{\text{p}}+\text{n}$ interactions. Within a simple geometrical picture we show that the double ratio for the production of ${\Sigma }^{-}\overline{\Lambda }$ and $\Lambda \overline{\Lambda }$ pairs for two different isotopes are related to the variation of the neutron skin thickness between the two nuclei. Performing high statistics calculations with the Gießen Boltzmann--Uehling--Uhlenbeck (GiBUU) transport model for several isotope pairs covering a wide range of elements we verify a strong correlation between the double ratio from the full transport simulations and the schematic model. This correlation enables us to quantify the potential of the proposed method for precise studies of neutron skin variations in isotope chains.

10 figures; updated version with published version in PRC

References in corpus (21)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
• A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
• Nuclear symmetry energy probed by neutron skin thickness of nuclei
• Accurate nuclear radii and binding energies from a chiral interaction
• Constraints on the symmetry energy and on neutron skins from the pygmy resonances in 68Ni and 132Sn
• Precision Determination of the Neutral Weak Form Factor of ${}^{48}$Ca
• Giant Quadrupole Resonances in 208Pb, the nuclear symmetry energy and the neutron skin thickness
• Neutron density distributions from antiprotonic 208Pb and 209Bi atoms
• Combined theoretical analysis of the parity-violating asymmetry for ${}^{48}$Ca and ${}^{208}Pb$
• Determination of the neutron skin of ${}^{208}$Pb from ultrarelativistic nuclear collisions
• Nuclear Charge Radii of the Nickel Isotopes ${}^{58-68,70}$Ni
• Ab initio computation of the longitudinal response function in ${}^{40}$Ca
• The neutron skin of ${}^{208}$Pb and the density dependence of the symmetry energy
• Neutron rich matter in heaven and on Earth
• Systematic Matter and Binding-Energy Distributions from a Dispersive Optical Model Analysis
• Antiproton-nucleus collisions simulation within a kinetic approach with relativistic mean fields
• Nuclear surface studies with antiprotonic atom X-rays
• Systematic trends of neutron skin thickness versus relative neutron excess
• A direct probe of $\Lambda$ potential in nuclear medium
• Exploring the neutron skin by hyperon-antihyperon production in antiproton-nucleus interactions

Cited by in corpus (1)

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