## 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 language | American English |
---|---|

Pages (from-to) | 90-94 |

Number of pages | 5 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 785 |

DOIs | |

State | Published - 10 Oct 2018 |

### Bibliographical note

Funding Information:J.H. and M.S. acknowledge financial support from the CTU-SGS Grant No. SGS16/243/OHK4/3T/14 . The work of N.B. is supported by the Pazy Foundation and by the Israel Science Foundation grant No. 1308/16 .

Publisher Copyright:

© 2018 The Authors

## Keywords

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

## Fingerprint

Dive into the research topics of 'Λ^{⁎}(1405)-matter: Stable or unstable?'. Together they form a unique fingerprint.