TY - JOUR
T1 - Λ⁎(1405)-matter
T2 - Stable or unstable?
AU - Hrtánková, J.
AU - Barnea, N.
AU - Friedman, E.
AU - Gal, A.
AU - Mareš, J.
AU - Schäfer, M.
N1 - Publisher Copyright:
© 2018 The Authors
PY - 2018/10/10
Y1 - 2018/10/10
N2 - 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.
AB - 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.
KW - Kaonic atoms
KW - RMF
KW - Strange matter
KW - Λ(1405) resonance
UR - http://www.scopus.com/inward/record.url?scp=85052289065&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2018.08.031
DO - 10.1016/j.physletb.2018.08.031
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AN - SCOPUS:85052289065
SN - 0370-2693
VL - 785
SP - 90
EP - 94
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -