Boundary between hadron and quark-gluon structure of nuclei

Pirner, Hans J.; Vary, James P.

doi:10.1103/physrevc.84.015201

Cited by 9 publications

(9 citation statements)

References 23 publications

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“…The values w 2 (w 3 ) could be compared with the probabilities of the existence of two (and three-nucleon) short-range correlations in nuclei, which were obtained in [13] and are (19.3 ± 4.1)% and (0.55 ± 0.17)% for carbon nucleus. This supports the hypothesis of Pirner and Vary [5] that short range correlations in nuclei and quark cluster approach could have the same origin.…”

Section: Discussionsupporting

confidence: 80%

“…Some theoretical approaches connect the interpretation of the cumulative effect to the contribution of multiquark states in nuclei (see, for example [4] and references therein). Such states arise while considering the transition from hadron to quark-gluon degrees of freedom in nuclear matter at high densities [5]. We have performed the experiment FRAGM [6] at ITEP TWA (Tera Watt Accumulator) heavy ion accelerator complex with the main goal to take data at high momenta of nuclear fragments.…”

Section: Introductionmentioning

confidence: 99%

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Nuclear fragmentation study at ITEP heavy ion facility

Abramov

Alekseev

Borodin

et al. 2012

J. Phys.: Conf. Ser.

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Projectile structure effects in multi-nucleon and cluster transfers in 16,18 O+ 164 Dy, 208 Pb reactions D C Biswas, Pratap Roy, Y K Gupta et al. -Comparison of models of neutron and residue production in targets heavy elements irradiated by relativistic proton and deuteron beams P Zhivkov, A Polanski, Ch Stoyanov et al. Abstract. In an experiment performed at ITEP TWA heavy ion accelerator, the yields of hydrogen (p,d,t) and helium (from 3 He to 8 He) isotopes at 3.5 o from fragmentation of 12 C at T0 = 0.2 -3.2 GeV/nucleon on a Be target have been measured. Momentum spectra of the fragments in the projectile rest frame have been obtained in larger momentum intervals than in the previous experiments with heavy ion beams. The main attention was given to the region of high momentum where fragment velocity exceeds the velocity of the projectile nucleus. The obtained data cover about 6 orders of the differential cross section magnitude. It made possible the observation of a transition from the Gaussian shape of the longitudinal momentum spectra in projectile rest frame, expected for the evaporation mechanism, to the exponential shape, typical for the cumulative (pre-equilibrium) processes. The Feynman x distributions for protons are analyzed in the framework of quark-gluon string model. The probabilities of existence of sixand nine-quark clusters are estimated and compared with the results on two-(three-) nucleon short range correlations in nuclei measured at Jefferson Laboratory.

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Section: Discussionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Nuclear fragmentation study at ITEP heavy ion facility

Abramov

Alekseev

Borodin

et al. 2012

J. Phys.: Conf. Ser.

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“…These states (first of all, six-quark states) are considered for nuclear matter phase transitions at high densities. At intermediate energies the production of multi-quark clusters in cold and hot baryonic matter blurs the boundary between hadronic and quark-gluon phases [6]. Probability of the two-nucleon flucton based on the experimental data on pion cumulative production was for the first time estimated in [7] for 12 C. Its value is in qualitative agreement with theoretical expectation for quark cluster in a nucleus, which was obtained later within quark cluster model [8].…”

Section: Introductionsupporting

confidence: 76%

Cumulative protons in¹²C fragmentation at intermediate energy

Abramov

Alekseev

Borodin

et al. 2014

EPJ Web of Conferences

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Abstract. In the FRAGM experiment at heavy ion accelerator complex TWAC-ITEP, the proton yields at an angle 3.5 • have been measured in fragmentation of carbon ions at T 0 = 0.3, 0.6, 0.95 and 2.0 GeV/nucleon on beryllium target. The data are presented as invariant proton yields on cumulative variable x in the range 0.9 < x < 2.4. Proton spectra cover six orders of invariant cross section magnitude. They have been analyzed in the framework of quark cluster fragmentation model. Fragmentation functions of quarkgluon string model are used. The probabilities of the existence of multi-quark clusters in carbon nuclei are estimated to be 8-12% for six-quark clusters and 0.2-0.6% for ninequark clusters.

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“…At high phase-space occupation, one expects, that due to the finite hadronic radii the overlap of their wave functions should lead to effects of the Pauli principle on the quark level (cf. excluded volume) and to the appearance of multi-quark admixtures to the hadronic states [52,53]. When interpreted in terms of hadron-hadron scattering phase shifts (see, e.g., Refs.…”

Section: Discussionmentioning

confidence: 99%

Chiral Condensate and Mott–Anderson Freeze-Out

et al. 2011

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We present the idea of a Mott-Anderson freeze-out that suggests a key role of the localization of the hadron wave functions when traversing the hadronization transition. The extension of hadron wave functions in dense matter is governed by the behavior of the chiral quark condensate such that its melting at finite temperatures and chemical potentials entails an increase of the size of hadrons and thus their geometrical strong interaction cross sections. It is demonstrated within a schematic resonance gas model, that a kinetic freeze-out condition reveals a correlation with the reduction of the chiral condensate in the phase diagram up to 50% of its vacuum value. Generalizing the description of the chiral condensate by taking into account a full hadron resonance gas such correlation gets distorted. We discuss, that this may be due to our approximations in calculating the chiral condensate which disregard both, in-medium effects on hadron masses and hadron-hadron interactions. The latter, in particular due to quark exchange reactions, could lead to a delocalization of the hadron wave functions in accordance with the picture of a Mott-Anderson transition.

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Boundary between hadron and quark-gluon structure of nuclei

Cited by 9 publications

References 23 publications

Nuclear fragmentation study at ITEP heavy ion facility

Nuclear fragmentation study at ITEP heavy ion facility

Cumulative protons in¹²C fragmentation at intermediate energy

Chiral Condensate and Mott–Anderson Freeze-Out

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Boundary between hadron and quark-gluon structure of nuclei

Cited by 9 publications

References 23 publications

Nuclear fragmentation study at ITEP heavy ion facility

Nuclear fragmentation study at ITEP heavy ion facility

Cumulative protons in12C fragmentation at intermediate energy

Chiral Condensate and Mott–Anderson Freeze-Out

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Cumulative protons in¹²C fragmentation at intermediate energy