@prefix mdl: <http://data.loterre.fr/ark:/67375/MDL> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

mdl: a skos:ConceptScheme .
mdl:-FZJQ9TZX-M
  skos:broader mdl:-MXZKC5SD-9 ;
  skos:definition "1) The difference between the total number of baryons and the total number of antibaryons in a system of subatomic particles. It is a measure of baryon asymmetry and is defined by the quantity η = (n_b - n_b-)/n_γ, called the baryon-photon ratio, where n_b is the comoving number density of baryons, n_b- is the number of antibaryons, and n_γ is that of photons. The value of η for the cosmic microwave background radiation (CMBR) has been very well determined by the WMAP satellite to be η = (6.14 ± 0.25) x 10⁻¹⁰. The baryon number is assumed to be constant. The photons created in stars amount to only a small fraction, less than 1%, of those in the CMBR.  2) A property of an elementary particle represented by a quantum number. It is equal to +1 for a baryon and -1 for an antibaryon. Bosons, leptons, and mesons have a baryon number B = 0. Quarks and antiquarks have baryon numbers of B = +1/3 and -1/3, respectively. The baryon number is conserved in all observed types of particle-particle interaction.  (An Etymological Dictionary of Astronomy and Astrophysics, by M. Heydari-Malayeri, <a href=\"https://dictionary.obspm.fr/index.php?formSearchTextfield=baryon+number&formSubmit=Search&showAll=1\" target=\"_blank\">https://dictionary.obspm.fr/index.php?formSearchTextfield=baryon+number&formSubmit=Search&showAll=1</a>)"@en, "1) La différence entre le nombre total de baryons et le nombre total d'antibaryons dans un système de particules subatomiques. 2) Une propriété d'une particule élémentaire représentée par un nombre quantique. Il est égal à +1 pour un baryon et -1 pour un antibaryon.  (traduit depuis \"An Etymological Dictionary of Astronomy and Astrophysics, by M. Heydari-Malayeri\", <a href=\"https://dictionary.obspm.fr/index.php?formSearchTextfield=baryon+number&formSubmit=Search&showAll=1\" target=\"_blank\">https://dictionary.obspm.fr/index.php?formSearchTextfield=baryon+number&formSubmit=Search&showAll=1</a>)"@fr ;
  skos:prefLabel "nombre baryonique"@fr, "baryon number"@en ;
  skos:inScheme mdl: ;
  skos:hiddenLabel "Baryon number"@en, "baryon numbers"@en, "nombres baryoniques"@fr, "Nombre baryonique"@fr, "Nombre baryoniques"@fr ;
  a skos:Concept ;
  skos:exactMatch <https://dictionary.obspm.fr/index.php?formSearchTextfield=baryon+number&formSubmit=Search&showAll=1> .

mdl:-MXZKC5SD-9
  skos:prefLabel "nombre quantique"@fr, "quantum number"@en ;
  a skos:Concept ;
  skos:narrower mdl:-FZJQ9TZX-M .