Hyperon single-particle potentials calculated from quark-model baryon–baryon interactions

Kohno, M.; Fujiwara, Y.; Fujita, Tadashi; Nakamoto, C.; Suzuki, Y.

doi:10.1016/s0375-9474(00)00164-0

Cited by 55 publications

(70 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This estimation is rather good for a low-energy ΣN interaction. For a higher momentum ΣN interaction, as is expected in a large momentumtransfer reaction, (π − , K + ) , the imaginary potential may be deeper according to theoretical estimations [31,32], although this statement is still unclear, since the experimental data on the ΣN → ΛN cross section are limited at a higher momentum region.…”

Section: Discussionmentioning

confidence: 98%

“…The Σ-nucleus potential suggested from the present measurement and the fitting analysis is more repulsive than those based on ND, NF, and NSC. A Σ single-particle potential has also been calculated [32] using the quark-model-based hyperon-nucleon interaction, model-FSS proposed by the Kyoto-Niigata group [37]. The Σ potential turns out to be 20.4 MeV repulsive, since the ΣN (I=3/2) 3 S 1 state shows a strongly repulsive nature due to the Pauli-exclusion effect between the quarks.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Σ-nucleus potential studied with the(π−,K+)reaction on medium-to-heavy nuclear targets

Saha¹,

Noumi²,

Abe³

et al. 2004

Phys. Rev. C

109

View full text Add to dashboard Cite

In order to study the Σ-nucleus optical potential, we measured inclusive (π − , K + ) spectra on medium-to-heavy nuclear targets: CH2, Si, Ni, In and Bi. The CH2 target was used to calibrate the excitation energy scale by using the elementary process p + π − → K + + Σ − , where the C spectrum was also extracted. The calibration was done with ±0.1 MeV precision. The angular distribution of the elementary cross section was measured, and agreed well with the previous bubble chamber data, but with better statistics, and the magnitudes of the cross sections of the measured inclusive (π − , K + ) spectra were also well calibrated. All of the inclusive spectra were found to be similar in shape at a region near to the Σ − binding energy threshold, showing a weak mass-number dependence on the magnitude of the cross section. The measured spectra were compared with a theoretical calculation performed within the framework of the Distorted Wave Impulse Approximation (DWIA). It has been demonstrated that a strongly repulsive Σ-nucleus potential with a non-zero size of the imaginary part is required to reproduce the shape of the measured spectra.

show abstract

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Σ-nucleus potential studied with the(π−,K+)reaction on medium-to-heavy nuclear targets

Saha¹,

Noumi²,

Abe³

et al. 2004

Phys. Rev. C

109

View full text Add to dashboard Cite

show abstract

“…In a Quark-Meson Coupling (QMC) model, medium modification of the color hyperfine interaction in the quark bag is found to be the origin of repulsive Σ potential [38]. The Σ potential in nuclear matter at saturation density is predicted to be around +30 MeV (repulsion) in a quark cluster model Y N potential [37], and a chiral model also predicts a similar repulsion [39].…”

Section: Relativistic Mean Field Model With Hyperonsmentioning

confidence: 94%

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

View full text Add to dashboard Cite

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 ).

show abstract

“…By contrast, experimental data concerning the Σ hyperon is quite scarce. (ii) It is argued from recent analysis of Σ − atoms and the absence of a clear signal for the formation of bound Σ states in (K − , π) reactions [22,23,24], as well as from calculations in quark models [25,26], that the Σ single particle potential is probably repulsive in nuclear matter. β-equilibrium calculations performed on the basis of this assumption predict that the threshold for Σ hyperon formation in neutron stars is shifted to very large densities.…”

Section: Skyrme Forcesmentioning

confidence: 99%

Neutrino scattering rates in the presence of hyperons from a Skyrme model in the RPA approximation

Mornas

2004

Eur. Phys. J. A

View full text Add to dashboard Cite

The contribution of Λ hyperons to neutrino scattering rates is calculated in the random phase approximation in a model where the interaction is described by a Skyrme potential. Finite temperature and neutrino trapping are taken into account in view of applications to the deleptonization stage of protoneutron star cooling. The hyperons can remove the problem of ferromagnetic instability common to (nearly) all Skyrme parametrizations of the nucleonnucleon interaction. As a consequence, there is not any longer a pole at the transition in the neutrino-baryon cross section. However there still remains an enhancement in this region. In the absence of ferromagnetism the mean free path in npΛ matter is reduced compared to its value in np matter as consequence of the presence of this additional degree of freedom. At high density the results are very sensitive to the choice of the Λ-Λ interaction.

show abstract

Hyperon single-particle potentials calculated from quark-model baryon–baryon interactions

Cited by 55 publications

References 58 publications

Σ-nucleus potential studied with the(π−,K+)reaction on medium-to-heavy nuclear targets

Σ-nucleus potential studied with the(π−,K+)reaction on medium-to-heavy nuclear targets

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

Neutrino scattering rates in the presence of hyperons from a Skyrme model in the RPA approximation

Contact Info

Product

Resources

About