Superfluidity of {Lambda} hyperons in neutron stars

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.025801· OSTI ID:21386634

Wang, Y N; Shen, H ^[1]

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1. Department of Physics, Nankai University, Tianjin 300071 (China)

We study the {sup 1}S{sub 0} superfluidity of {Lambda} hyperons in neutron star matter and neutron stars. We use the relativistic mean field (RMF) theory to calculate the properties of neutron star matter. In the RMF approach, the meson-hyperon couplings are constrained by reasonable hyperon potentials that include the updated information from recent developments in hypernuclear physics. To examine the {sup 1}S{sub 0} pairing gap of {Lambda} hyperons, we employ several {Lambda}{Lambda} interactions based on the Nijmegen models and used in double-{Lambda} hypernuclei studies. It is found that the maximal pairing gap obtained is a few tenths of a MeV. The magnitude and the density region of the pairing gap are dependent on the {Lambda}{Lambda} interaction and the treatment of neutron star matter. We calculate neutron star properties and find that whether the {sup 1}S{sub 0} superfluidity of {Lambda} hyperons exists in the core of neutron stars mainly depends on the {Lambda}{Lambda} interaction used.

• OSTI ID: 21386634
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 81, Issue 2; Other Information: DOI: 10.1103/PhysRevC.81.025801; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPUTERIZED SIMULATION
COUPLING
DENSITY
HYPERNUCLEI
HYPERONS
INTERACTIONS
LAMBDA PARTICLES
MEAN-FIELD THEORY
MESONS
MEV RANGE 10-100
NEUTRON STARS
NUCLEAR MATTER
RELATIVISTIC RANGE
SUPERFLUIDITY
BARYONS
BOSONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRONS
LAMBDA BARYONS
MATTER
MEV RANGE
NUCLEAR FRAGMENTS
NUCLEI
PHYSICAL PROPERTIES
SIMULATION
STARS
STRANGE PARTICLES