Constraints on Σ-nucleus dynamics from dirac phenomenology of Σ− atoms

Mareš, J.; Friedman, E.; Gal, A.; Jenning, B.K.

doi:10.1016/0375-9474(95)00358-8

Cited by 160 publications

(154 citation statements)

References 45 publications

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“…It has been shown that the experimental data is compatible with the analysis by the Nijmegen model F for the baryon-baryon interaction, which gives a repulsive isoscalar part and a large positive isospin dependent term (Lane potential) for the Σ-nucleus potential [78]. The analysis of Σ − atom data also shows the repulsive Σ − potential [80]. Theoretically, a repulsive Σ potential in nuclear matter has been obtained from the G matrix calculation based on the SU(6) quark model baryon-baryon interaction [81].…”

Section: Potential Contributionsupporting

confidence: 58%

Kaonic modes in hyperonic matter and p-wave kaon condensation

Muto

2002

Nuclear Physics A

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Kaon excitations (kaonic modes) are investigated in hyperonic matter, where hyperons (Λ, Σ − , Ξ − ) are mixed in the ground state of neutron-star matter. P -wave kaon-baryon interactions as well as the s-wave interactions are taken into account within chiral effective Lagrangian, and the nonrelativistic effective baryon-baryon interactions are incorporated. When the hyperon Λ is more abundant than the proton at high baryon density, a proton-particle-Λ-hole mode, which has the K + quantum number, appears in addition to other particle-hole modes with the K − quantum number. It is shown that the system becomes unstable with respect to a spontaneous creation of a pair of the particle-hole modes with K + and K − quantum numbers, stemming from the p-wave kaon-baryon interaction. The onset density of this p-wave kaon condensation may be lower than that of the s-wave K − condensation.

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Section: Potential Contributionsupporting

confidence: 58%

Kaonic modes in hyperonic matter and p-wave kaon condensation

Muto

2002

Nuclear Physics A

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“…For Σ hyperons, it is necessary to analyze continuum spectra. In the observed (quasi-)bound Σ nucleus Σ − -nucleus potential having a shallow attractive pocket around the nuclear surface and repulsion inside the nucleus [34,35,36], but the atomic energy shift is not sensitive to the potential inside the nucleus. In the distorted wave impulse approximation (DWIA) analyses of the quasi free (QF) spectrum in the continuum region [20,21,22,23], it is suggested that the Σ hyperon would feel repulsive real potential of 10 ∼ 90MeV.…”

Section: Relativistic Mean Field Model With Hyperonsmentioning

confidence: 87%

Tables of hyperonic matter equation of state for core-collapse supernovae

Ishizuka

Ohnishi

Tsubakihara

et al. 2008

J. Phys. G: Nucl. Part. Phys.

155

226

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Abstract. We present sets of equation of state (EOS) of nuclear matter including hyperons using an SU f (3) extended relativistic mean field (RMF) model with a wide coverage of density, temperature, and charge fraction for numerical simulations of core collapse supernovae. Coupling constants of Σ and Ξ hyperons with the σ meson are determined to fit the hyperon potential depths in nuclear matter, U Σ (ρ 0 ) ≃ +30MeV and U Ξ (ρ 0 ) ≃ −15MeV, which are suggested from recent analyses of hyperon production reactions. At low densities, the EOS of uniform matter is connected with the EOS by Shen et al., in which formation of finite nuclei is included in the Thomas-Fermi approximation. In the present EOS, the maximum mass of neutron stars decreases from 2.17M ⊙ (N eµ) to 1.63M ⊙ (N Y eµ) when hyperons are included. In a spherical, adiabatic collapse of a 15M ⊙ star by the hydrodynamics without neutrino transfer, hyperon effects are found to be small, since the temperature and density do not reach the region of hyperon mixture, where the hyperon fraction is above 1 % (T > 40MeV or ρ B > 0.4 fm −3 ).

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“…Let us consider the elastic scattering of − hyperons from 28 Si [9,31]. We calculate the angular distributions of the differential cross section in this elastic scattering, using several types of the -nucleus potential (see Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The latest analyses of the − atomic x ray have suggested that the -nucleus potential has a repulsion inside the nuclear surface and a shallow attraction outside the nucleus with a sizable absorption [6,[8][9][10][11]. Noumi and his collaborators [12,13] have performed measurements of hypernuclei by inclusive (π − , K + ) reactions on C, Si, Ni, In, and Bi targets at p π = 1.20 GeV/c in KEK-E438 experiments.…”

Section: Introductionmentioning

confidence: 99%

Angular distributions of elastic scattering ofΣ−hyperons from nuclei and theΣ-nucleus potentials

Harada¹,

Hirabayashi²

2012

Phys. Rev. C

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We theoretically investigate the elastic scattering of 50-MeV − hyperons from 28 Si and 208 Pb in order to clarify the radial distribution of -nucleus (optical) potentials. The angular distributions of differential cross sections are calculated using several potentials that can explain experimental data of the − atomic x-ray and (π − , K + ) reaction spectra simultaneously. The magnitude and oscillation pattern of the angular distributions are understood by the use of nearside/farside decompositions of their scattering amplitudes. It is shown that the resultant angular distributions provide a clue to discriminating among the radial distributions of the potentials that have a repulsion inside the nuclear surface and an attraction outside the nucleus with a sizable absorption.

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Constraints on Σ-nucleus dynamics from dirac phenomenology of Σ− atoms

Cited by 160 publications

References 45 publications

Kaonic modes in hyperonic matter and p-wave kaon condensation

Kaonic modes in hyperonic matter and p-wave kaon condensation

Tables of hyperonic matter equation of state for core-collapse supernovae

Angular distributions of elastic scattering ofΣ−hyperons from nuclei and theΣ-nucleus potentials

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