Powered by OpenAIRE graph
Found an issue? Give us feedback
addClaim

This Research product is the result of merged Research products in OpenAIRE.

You have already added 0 works in your ORCID record related to the merged Research product.

Aspects of strange matter

Authors: Dover, C. B.;

Aspects of strange matter

Abstract

We discuss the stability of multiply strange baryonic systems, in the context of a mean field approach obtained from an underlying set of phenomenological meson-baryon interactions. The coupling parameters which determine the conventional {sigma} + {omega} mean fields (Hartree potentials) seen by varius baryon species (N, {lambda}, {Xi}) in the many-body system are constrained by reproducing the trend of observed binding energies of single particle (N, {lambda}, {Xi}) states, as well as the energy per particle and density of non- strange nuclear matter. We also consider additional scalar ({sigma}{asterisk}) and vector ({phi}) fields which couple strongly to strange baryons. The couplings of these fields are adjusted to produce strong hyperon-hyperon interactions, as suggested by the data on {Lambda}{Lambda} hypernuclei. Extrapolating this approach to systems of large strangeness S, we find a broad class of objects composed of neutrons, protons, {Lambda}`s and {Xi}`s, which are stable against strong decay. In these systems, the presence of filled {Lambda} orbitals blocks the strong decay {Xi} N {yields} {Lambda}{Lambda}, leading to a strangeness fraction {integral}{sub s} = {vert_bar}S{vert_bar}/A {approx} 1, density p {approx} (2{minus}3){sub po}, and charge fraction {integral}{sub q} in the range {minus}0.1 < q/A < 0.1, comparable to that of hypothetical stable strange quark matter (``strangelets``), but with a low binding energy per particle E{sub B}/A{approx}{minus}10 to {minus}20 MeV. Such weakly bound multi-strange objects can be stable for very large A, unlike ordinary nuclei, since the Coulomb repulsion generated by the protons is largely cancelled by the presence of a comparable number of {Xi}`s, leading to a small net charge (positive or negative) of order A{sup 1/3}.

Country
United States
Related Organizations
Keywords

Binding Energy, Quark Matter, 66 Physics, Strangeness, Heavy Ion Reactions, Hyperons, Mean-Field Theory, Meson-Baryon Interactions, Strange Particles, Hyperon-Hyperon Interactions

  • BIP!
    Impact byBIP!
    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
Powered by OpenAIRE graph
Found an issue? Give us feedback
citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Upload OA version
Are you the author? Do you have the OA version of this publication?