Soft-core baryon-baryon potentials for the complete baryon octet

Stoks, V. G. J.; Rijken, Th. A.

doi:10.1103/physrevc.59.3009

Cited by 387 publications

(548 citation statements)

References 34 publications

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“…The inclusion of the hyperon-hyperon interaction leads to a further softening of the EOS, since this interaction is attractive over the whole density range explored. This is mainly due to the ΣΣ interaction which is strongly enough to develop a bound state [4]. We note, however, that the ΛΛ attraction produced by this model is only mild, not being able to reproduce the experimental 2Λ separation energy of ∆B ΛΛ ∼ 4 − 5 MeV.…”

Section: Discussionmentioning

confidence: 78%

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Hyperon effects on the properties of β-stable neutron star matter

Vidaña¹,

Polls²,

Ramos³

et al. 2001

Nuclear Physics A

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We present results from Brueckner-Hartree-Fock calculations for β-stable neutron star matter with nucleonic and hyperonic degrees of freedom employing the most recent parametrizations of the baryon-baryon interaction of the Nijmegen group. Only Σ − and Λ are present up to densities ∼ 7ρ 0 . The corresponding equations of state are then used to compute properties of neutron stars such as masses and radii.

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Section: Discussionmentioning

confidence: 78%

“…[4]. This potential describes all the strangeness sectors from S = 0 to S = −4 and is based on SU(3) extensions of the Nijmegen nucleon-nucleon and hyperon-nucleon potentials.…”

Section: Formalismmentioning

confidence: 99%

Hyperon effects on the properties of β-stable neutron star matter

Vidaña¹,

Polls²,

Ramos³

et al. 2001

Nuclear Physics A

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“…In our work the Nijmegen soft-core NY potentials NSC89 [11], NSC97f [12], or ESC08b [13] are used, which are fitted to the available experimental NY scattering data, together with the nucleonic forces + TBF introduced before. With the NN and NY potentials, the various G matrices are evaluated by solving numerically the Bethe-Goldstone equation, written in operatorial form as with the s.p.…”

Section: Hyperons In Nuclear Mattermentioning

confidence: 99%

Neutron Star Structure with Hyperons and Quarks

Schulze¹

2015

Proceedings of the International Symposium “Nanoscience and Quantum Physics 2012” (nanoPHYS’12)

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The high-density nuclear equation of state within the Brueckner-Hartree-Fock approach is discussed, with particular attention to the effects of nucleonic three-body forces, the presence of hyperons, and the joining with an eventual quark matter phase. The resulting properties of neutron stars, in particular the mass-radius relation, are determined. It turns out that in this approach stars heavier than about 1.4 solar masses contain necessarily quark matter.

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“…In order to understand the enhancement factor as a function of the Λ-n relative momentum q, we computed the enhancement factors, as a function of q, by using combinations of a and r from Refs. [11][12][13][14][15][16][17].…”

Section: Feasibility Of the Measurement Of λ-N Final State Interactiomentioning

confidence: 99%

Study of Λ-n Interaction via FSI in γ+d Reaction

Kaneta¹

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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In this paper we present our motivation for an experiment to measure the scattering length and the effective range of the Λ-n interaction via γ + d reaction using NKS2 spectrometer at Research Center of Electron Photon Science (ELPH), Tohoku University. The effective range approximation is adopted as an approach to estimate the contribution of the enhancement effect in the spectrometer acceptance. For this purpose, we outline and describe the already completed upgrades and further intended improvement in preparation for the new experiment. KEYWORDS:Baryon-Baryon interaction, strangeness, photo-reaction IntroductionThe NKS2 collaboration has been studying the strangeness photoproduction in γ + d reaction near the threshold at ELPH-TOHOKU. A new future focus now includes investigating the Λn interaction via a K + measurement in γ + d reaction. Most of the past efforts involving the ΛN interaction were made through hypernuclei. Results from these studies have highlighted a discrepancy between experimental data and theoretical calculations for the Λ binding energy of 4 Λ H and 4 Λ He. The source of this inconsistency is attributed to the charge symmetry breaking (CSB) in ΛN interaction. Recent reports on precise measurements for 4 Λ H at MAMI [1] and 4 Λ He at J-PARC [2] support the large CSB effect in the ΛN interaction suggested by old emulsion experiments.One of the keys to understand the ΛN CSB is a comparison of Λp with Λn interaction by direct measurement. Presently there are no reported data sets for Λn scattering primarily due to lack of a neutron target and difficulty in experimental setup. In contrast, there have been reported data for Λp interaction from scattering experiments. Consequently, the S-wave Λn scattering length is still not determined. To obtain information about the Λn interaction, we propose a different kind of experiment from hypernuclear studies, which require not only details on the interaction, but also discussions on nuclear structure. The K + measurement in γ+d reaction should yield important information on inelastic scattering and the low energy region of Λn interaction.Theoretical studies show that the cross section of K + production differs in γ + d from γ + p by the final state interaction (FSI) of Λn. The effect appears in the production threshold region and is roughly 10 times larger in forward and backward region in CM system [3][4][5][6]. NKS2 experimentThe NKS2 spectrometer is located downstream of a real photon beam line in the 2nd experimental hall at ELPH. The photon tagging system is located in a synchrotron ring and provides timing and energy information for the generated photons. The photon beam is produced by bremsstrahlung from electrons scattered by a carbon wire inserted into the path of the orbiting electrons and the recoil electrons are measured by the tagger. energy of orbiting electrons with a maximum electron energy of the stretcher booster ring of 1.2 GeV. More detailed information on the photon tagging system can be found elsewhere [7].The booster ring was re...

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Soft-core baryon-baryon potentials for the complete baryon octet

Cited by 387 publications

References 34 publications

Hyperon effects on the properties of β-stable neutron star matter

Hyperon effects on the properties of β-stable neutron star matter

Neutron Star Structure with Hyperons and Quarks

Study of Λ-n Interaction via FSI in γ+d Reaction

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