2018/05/31 by J. Hrtánková, Jaroslava Hrtánková, Nir Barnea +7 · 1 citation
Physics and Astronomy · #Atomic physics #Bar (unit) #Baryon #Binding energy #Bubble chamber #Charge (physics) #High-Energy Particle Collisions Research #Hyperon #Isospin #Lambda #Lambda baryon #Meson #Nuclear matter #Nuclear physics #Nuclear physics research studies #Nucleon #Order (exchange) #Particle physics #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1016/j.physletb.2018.08.031
published as Phys. Letters B 785 (2018) 90-94 · v2 -- slightly added discussion, version accepted for publication in Phys. Lett. B
openalex created_date 2018/06/13 · arxiv created 2018/08/03 · openalex publication_date 2018/08/24 · arxiv updated 2018/09/11 · openalex updated_date 2026/08/05
A recent suggestion by Akaishi and Yamazaki (2017) [3] that purely-Λ⁎(1405) nuclei provide the absolute minimum energy in charge-neutral baryon matter for baryon-number A≳8, is tested within RMF calculations. A broad range of Λ⁎ interaction strengths, commensurate with (K¯K¯NN)I=0 binding energy assumed to be of order 100 MeV, is scanned. It is found that the binding energy per Λ⁎, B/A, saturates for A≳120 with values of B/A considerably below 100 MeV, implying that Λ⁎(1405) matter is highly unstable against strong decay to Λ and Σ hyperon aggregates. The central density of Λ⁎ matter is found to saturate as well, at roughly twice nuclear matter density. Moreover, it is shown that the underlying very strong K¯N potentials, fitted for isospin I=0 to the mass and width values of Λ⁎(1405), fail to reproduce values of single-nucleon absorption fractions deduced across the periodic table from K− capture-at-rest bubble chamber experiments.