Change of MIT bag constant in nuclear medium and implication for the EMC effect

Jin, Xuemin; Jennings, B.K.

doi:10.1103/physrevc.55.1567

Cited by 35 publications

(28 citation statements)

References 53 publications

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“…The second essential ingredient has only been obtained quite recently. The quark meson coupling model (QMC), which is based on explicit quark degrees of freedom, is ideally suited for this purpose [22]- [27]. In its simplest form it is also based on the MIT bag model, with the interactions between different nucleons described by the exchange of scalar and vector mesons in mean field approximation.…”

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confidence: 99%

Spin dependent parton distributions in a bound nucleon

et al. 1999

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The determination of the spin distribution functions for the neutron requires an understanding of the changes induced by a nuclear medium. We present the first estimates of the changes induced in the spin-dependent, valence parton distributions of the proton and neutron bound in 3 He and 6 Li. For 3 He the result is quite reassuring, in that the off-shell correction to g 1n is very small. On the other hand, in 6 Li the corrections to the spin distributions in the bound proton are sufficiently large that they should be taken into account if one aims for a precision of better than 10%. We provide a simple parametrization of the off-shell changes in the valence spin distributions of 3 He and 6 Li, which can be used with any conventional estimate of nuclear binding and Fermi motion corrections.

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confidence: 99%

Spin dependent parton distributions in a bound nucleon

et al. 1999

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“…In the simple QMC model, the bag parameter B is taken as B 0 corresponding to its value for a free baryon. The medium effects are taken into account in the MQMC model [12,13] by coupling the bag parameter to the scalar meson fields. In the present work we generalize the coupling suggested in the latter references to the case of two scalar meson fields by using the following ansatz for the bag parameter…”

Section: The Quark Meson Coupling Model For Hypernuclear Mattermentioning

confidence: 99%

Hot hypernuclear matter in the modified quark-meson coupling model

et al. 2000

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Hot hypernuclear matter is investigated in an explicit SU͑3͒ quark model based on a mean-field description of nonoverlapping baryon bags bound by the self-consistent exchange of scalar , and vector , mesons. The , mean fields are assumed to couple to the u,d quarks while the , mean fields are coupled to the s quark. The coupling constants of the mean fields with the quarks are assumed to satisfy SU͑6͒ symmetry. The calculations take into account the medium dependence of the bag parameter on the scalar fields ,. We consider only the octet baryons N,⌳,⌺,⌶ in hypernuclear matter. An ideal gas of the strange mesons K and K* is introduced to keep zero the net strangeness density. Our results for symmetric hypernuclear matter show that a phase transition takes place at a critical temperature around 160Ϯ10 MeV in which the scalar mean fields , take nonzero values at zero baryon density. Furthermore, the bag parameters of the baryons decrease significantly at and above this critical temperature, indicating the onset of quark deconfinement. The present results imply that the onset of quark deconfinement in SU͑3͒ hypernuclear matter is much stronger than in SU͑2͒ nuclear matter.

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“…An important quantity is the nucleon size which is represented in the framework of the QMC model by the bag radius [17]. The density dependence of the bag radius can be seen in Fig.…”

Section: Properties Of Nuclear Mattermentioning

confidence: 99%

“…One of the basic motivations of applying quark models to nuclear systems is the hope to describe medium modifications of the internal quark-substructure of the nucleon. An important phenomenological quantity is the nucleon size which is represented in the framework of the QMC model by the bag radius [17]. Due to the increase of the bag constant the MQMC model predicts significantly swollen nucleons in the nuclear environment [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Critical analysis of quark-meson coupling models for nuclear matter and finite nuclei

Müller

Jennings

1998

Nuclear Physics A

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Three versions of the quark-meson coupling (QMC) model are applied to describe properties of nuclear matter and finite nuclei. The models differ in the treatment of the bag constant and in terms of nonlinear scalar selfinteractions. In two versions of the model the bag constant is held fixed at its free space value whereas in the third model it depends on the density of the nuclear environment. As a consequence opposite predictions for the medium modifications of the internal nucleon structure arise. After calibrating the model parameters at equilibrium nuclear matter density, binding energies, charge radii, single-particle spectra and density distributions of spherical nuclei are analyzed and compared with QHD calculations. For the models which predict a decreasing size of the nucleon in the nuclear environment, unrealistic features of the nuclear shapes arise.

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Change of MIT bag constant in nuclear medium and implication for the EMC effect

Cited by 35 publications

References 53 publications

Spin dependent parton distributions in a bound nucleon

Spin dependent parton distributions in a bound nucleon

Hot hypernuclear matter in the modified quark-meson coupling model

Critical analysis of quark-meson coupling models for nuclear matter and finite nuclei

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