Λ(1405)-matter: Stable or unstable?

J. Hrtánková, N. Barnea, E. Friedman, A. Gal*, J. Mareš, M. Schäfer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

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.

Original languageAmerican English
Pages (from-to)90-94
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume785
DOIs
StatePublished - 10 Oct 2018

Bibliographical note

Publisher Copyright:
© 2018 The Authors

Keywords

  • Kaonic atoms
  • RMF
  • Strange matter
  • Λ(1405) resonance

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