Quark cluster probabilities in nuclei

Sato, Masumi; Coon, S. A.; Pirner, Hans J.; Vary, J. P.

doi:10.1103/physrevc.33.1062

Cited by 50 publications

(48 citation statements)

References 32 publications

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“…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]. Similar model, in which fragmentation functions of quark clusters were calculated within the quark-gluon string model, was successfully used in [4] for the description of K − , π-and antiproton inclusive spectra in hadron-nucleus interactions.…”

Section: Introductionsupporting

confidence: 76%

“…The important result of the presented analysis is the demonstration of possibility to use data on cumulative proton yields in the inverse kinematics (in projectile fragmentation region) for estimates of these probabilities. Obtained w 2 can be compared as with the value of 6%, obtained in [7] in the data analysis on cumulative pions, as with theoretical predictions of 12.5% given in [8]. However, the value of w 3 is much smaller than predicted 2.6% of [8].…”

Section: Discussionmentioning

confidence: 99%

“…Obtained w 2 can be compared as with the value of 6%, obtained in [7] in the data analysis on cumulative pions, as with theoretical predictions of 12.5% given in [8]. However, the value of w 3 is much smaller than predicted 2.6% of [8]. The values w 2 (w 3 ) can be also compared with probabilities of existence of two-nucleon (three-nucleon) correlations in nuclei, obtained in the experiment of TJNAF on electron scattering on nuclei [13], being (19.3 ± 4.1)% and (0.55 ± 0.17)% for carbon nucleus.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Introductionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Cumulative protons in¹²C fragmentation at intermediate energy

Abramov

Alekseev

Borodin

et al. 2014

EPJ Web of Conferences

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“…Since the values of W A j for j = 2, 3, obtained in the model [4], have essentially weaker A-and j-dependencies compared to those calculated in [17] within the model [8], the absolute values of W A 2 and W A 3 in these models differ significantly (see discussion in [10]). However, the probability ratios W [4] for light nuclei and for the iron nucleus (A = 56), whereas in [17] they were obtained at the same footing for a wide range of nuclei from helium to uranium. Therefore, in the subsequent analysis we will use the probability ratios presented in Table VI, W A j /W Be j (j = 1, 2, 3) calculated in [17] within the quark-clustermodel [8].…”

Section: Resultsmentioning

confidence: 99%

Probing of compact baryonic configurations in nuclei inA(p,p¯)Xreactions and antiproton formation length in nuclear matter

et al. 2012

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Inclusive cross sections σ A = Ed 3 σ(X, P 2 t )/d 3 p of antiproton and negative pion production on Be, Al, Cu and Ta targets hit by 10 GeV protons were measured at the laboratory angles of 10.5• and 59• . Antiproton cross sections were obtained in both kinematically allowed and kinematically forbidden regions for antiproton production on a free nucleon. The antiproton cross section ratio as a function of the longitudinal variable X exhibits three separate plateaus which gives evidence for the existence of compact baryon configurations in nuclei-small-distance scaled objects of nuclear structure. Comparability of the measured cross section ratios with those obtained in the inclusive electron scattering off nuclei suggests a weak antiproton absorption in nuclei. Observed behavior of the cross section ratios is interpreted in the framework of a model considering the hadron production as a fragmentation of quarks (antiquarks) into hadrons. It has been established that the antiproton formation length in nuclear matter can reach the magnitude of 4.5 fm.

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“…The calculations by Sato [39] show that the probability for forming 9-quark clusters increases with the nuclear mass number A. In our present discussion of light nuclei, they can be neglected.…”

Section: Discussion and Summarymentioning

confidence: 93%

Nuclear effects on the extraction of neutron structure functions

Schmidt

Yang

2001

Eur. Phys. J. C

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Nuclear effects in light nuclei due to the presence of spin-one isosinglet 6-quark clusters are investigated. The quark distributions of 6-quark clusters are obtained by using a perturbative QCD (pQCD) based framework, which allows us to get a good description of the ratio of the deuteron structure function to the free nucleon structure function. Nuclear effects on the extraction of the neutron structure functions F n 2 and g n 1 are estimated. We find that the effect on the extracted spin-dependent neutron structure function is very different from that on the spin-independent neutron structure function. The effect enhances the Bjorken sum by about 10%, whereas its correction to the Gottfried sum is rather small. The formalism for calculating nuclear effects is further used to evaluate the spin-dependent structure function of the 3 He nucleus and a good self-consistent check is obtained.

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Quark cluster probabilities in nuclei

Cited by 50 publications

References 32 publications

Cumulative protons in¹²C fragmentation at intermediate energy

Cumulative protons in¹²C fragmentation at intermediate energy

Probing of compact baryonic configurations in nuclei inA(p,p¯)Xreactions and antiproton formation length in nuclear matter

Nuclear effects on the extraction of neutron structure functions

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Quark cluster probabilities in nuclei

Cited by 50 publications

References 32 publications

Cumulative protons in12C fragmentation at intermediate energy

Cumulative protons in12C fragmentation at intermediate energy

Probing of compact baryonic configurations in nuclei inA(p,p¯)Xreactions and antiproton formation length in nuclear matter

Nuclear effects on the extraction of neutron structure functions

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Cumulative protons in¹²C fragmentation at intermediate energy

Cumulative protons in¹²C fragmentation at intermediate energy