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4. Light fragments from (C + Be) interactions at 0.6 GeV/nucleon

Author

Abramov, B. M., Alekseev, P. N., Borodin, Yu. A., Bulychjov, S. A., Dukhovskoy, I. A., Khanov, A. I., Krutenkova, A. P., Kulikov, V. V., Martemianov, M. A., Mashnik, S. G., Matsyuk, M. A., Turdakina, E. N., and Zarubin, P. I.

Subjects
Nuclear Experiment
Abstract

Nuclear fragments emitted at 3.5 degrees in 12C fragmentation at 0.6 GeV/nucleon have been measured. The spectra obtained are used for testing the predictions of four ion-ion interaction models: INCL++, BC, LAQGSM03.03 and QMD as well as for the comparison with the analytical parametrization in the framework of thermodynamical picture of fragmentation., Comment: 6 pages, 3 figures, proc. 12th Int. Conf. on Nucleus-Nucleus Collisions (NN2015), June 21-26, 2015, Catania, Italy

Published
2015
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5. Cumulative \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\pi}$$\end{document} \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${}^{{12}}{C}{+}{}^{{9}}$$\end{document}-Mesons in \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\pi}$$\end{document} \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${}^{{12}}{C}{+}{}^{{9}}$$\end{document}Be-Interactions at 3.2 GeV/Nucleon

Author

Abramov, B. M., Baznat, M., Borodin, Yu. A., Bulychjov, S. A., Dukhovskoy, I. A., Krutenkova, A. P., Kulikov, V. V., Martemianov, M. A., Matsyuk, M. A., and Turdakina, E. N.

Published
2021
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6. Verification of Monte Carlo transport codes against measured small angle p-, d-, and t-emission in carbon fragmentation at 600 MeV/nucleon

Author

Abramov, B. M., Alexeev, P. N., Borodin, Yu. A., Bulychjov, S. A., Dukhovskoy, I. A., Krutenkova, A. P., Kulikov, V. V., Martemianov, M. A., Matsyuk, M. A., Turdakina, E. N., Khanov, A. I., and Mashnik, S. G.

Subjects
Nuclear Experiment
Abstract

Momentum spectra of hydrogen isotopes have been measured at 3.5 deg from C12 fragmentation on a Be target. Momentum spectra cover both the region of fragmentation maximum and the cumulative region. Differential cross sections span five orders of magnitude. The data are compared to predictions of four Monte Carlo codes: QMD, LAQGSM, BC, and INCL++. There are large differences between the data and predictions of some models in the high momentum region. The INCL++ code gives the best and almost perfect description of the data., Comment: 8 pages, 4 figures, XXII International Baldin Seminar on High Energy Physics Problems September 15-20, 2014, JINR, Dubna, Russia; to be published in Proceedings of Science

Published
2015

7. Quark cluster contribution to cumulative proton emission in fragmentation of carbon ions

Author

Abramov, B. M., Alekseev, P. N., Borodin, Yu. A., Bulychjov, S. A., Dukhovskoy, I. A., Khanov, A. I., Krutenkova, A. P., Kulikov, V. V., Martemyanov, M. A., Matsyuk, M. A., and Turdakina, E. N.

Subjects
Nuclear Experiment
Abstract

In the FRAGM experiment at heavy ion accelerator complex TWAC-ITEP, the proton yields at an angle 3.5$^\circ$ have been measured at fragmentation of carbon ions at $T_0 = $ 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 quark-gluon 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 nine-quark clusters., Comment: 4 pages, 5 figures, Russian version published in Russian Journal Pis'ma v ZhETF

Published
2013

8. Inclusive pion double charge exchange on Oxygen(16) at 0.6-1.1 GeV

Author

Abramov, B. M., Borodin, Yu. A., Bulychjov, S. A., Dukhovskoy, I. A., Kaidalov, A. B., Krutenkova, A. P., Kulikov, V. V., Matsyuk, M. A., Radkevich, I. A., Turdakina, E. N., Alvarez-Ruso, L., and Vacas, M. J. Vicente

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The inclusive pion double charge exchange (DCX) on oxygen nuclei has been measured in the region where additional pion production is kinematically forbidden. The experiment was performed at ITEP PS at incident pi- kinetic energies T_0= 0.59, 0.75 and 1.1 GeV. The integrated forward differential cross section was found to decrease with energy slowly. At 1.1 GeV it exceeds the theoretical prediction within the conventional sequential single charge exchange mechanism with a neutral pion in the intermediate state (Glauber elastic rescattering) by about half an order of magnitude. The sequential mechanism with two pions in the intermediate state (Glauber inelastic rescatterings), which was proposed recently, seems to be able to explain the observed slow energy dependence and allows to predict the DCX cross section for higher energies., Comment: 27 pages, 13 figures. Minor corrections, one figure added. Accepted in NPA

Published
2002
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9. Parameters of Fermi-motion from Quasielastic Backward Pion-Proton Scattering on Nuclei

Author

Abramov, B. M., Bulychjov, S. A., Dukhovskoy, I. A., Khanov, A. I., Krestnikov, Y. S., Krutenkova, A. P., Kulikov, V. V., Matsuk, M. A., Radkevich, I. A., and Turdakina, E. N.

Subjects
Nuclear Experiment
Abstract

In experiment on the study of the quasielastic pion-proton scattering at large momentum transfer on nuclei the proton Fermi-momentum distributions have been analysed in plane-wave approximation for light nuclei $^6$Li, $^7$Li and $^{12}$C. It was found that, contrary to (e,e') experiments, that the oscillator model gives slightly better description of our data than the Fermi - gas model. But the values of parameters of the distributions obtained in our analysis are considerably smaller, than in (e,e') experiments. It gives evidence that the plane-wave approximation is not sufficient and more complicated theoretical models which take into account the effects of distortion of pion-nucleon amplitude in a nuclear medium are necessary for analysis of our data., Comment: 6 pages, 4 figures

Published
1999

24. Ion production in the 12C + 9Be interactions at GeV energies

Author

Abramov, B M, primary, Borodin, Yu A, additional, Bulychjov, S A, additional, Dukhovskoy, I A, additional, Khanov, A I, additional, Krutenkova, A P, additional, Kulikov, V V, additional, Martemianov, M A, additional, Matsyuk, M A, additional, and Turdakina, E N, additional

Published
2019
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26. Cumulative -Mesons in Be-Interactions at 3.2 GeV/Nucleon.

Author

Abramov, B. M., Baznat, M., Borodin, Yu. A., Bulychjov, S. A., Dukhovskoy, I. A., Krutenkova, A. P., Kulikov, V. V., Martemianov, M. A., Matsyuk, M. A., and Turdakina, E. N.

Subjects
PARTICLES (Nuclear physics), ION-ion collisions, ION energy, MESONS, NUCLEON-nucleon interactions, BERYLLIUM
Abstract

In the FRAGM experiment at the heavy-ion accelerator accumulator complex ITEP TWA, yields of cumulative charged mesons have been measured in a fragmentation of carbon ions with the energy of 3.2 GeV/nucleon on a beryllium target. The momentum spectra of mesons cover four orders of the invariant cross section magnitude. They demonstrate the exponential fall with increasing energy. The measured inverse slope parameter is compared with similar measurements in nucleon–nucleus interactions and ion–ion collisions at lower energies. The energy dependence of the ratio of the yields of negative to positive mesons is presented. This dependence is discussed in a connection with Coulomb and isotopic effects. The obtained data are compared with predictions of several ion–ion interaction models. [ABSTRACT FROM AUTHOR]

Published
2021
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27. Carbon fragmentation at 300 MeV/nucleon vs statistical model

Author

Abramov, B M, primary, Alexeev, P N, additional, Borodin, Yu A, additional, Bulychjov, S A, additional, Dukhovskoy, I A, additional, Khanov, A I, additional, Krutenkova, A P, additional, Kulikov, V V, additional, Martemianov, M A, additional, Matsyuk, M A, additional, and Turdakina, E N, additional

Published
2017
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28. Carbon fragmentation at 300 MeV/nucleon vs transport codes.

Author

Abramov, B. M., Alexeev, P. N., Borodin, Yu. A., Bulychjov, S. A., Dukhovskoy, I. A., Gudima, K. K., Khanov, A. I., Krutenkova, A. P., Kulikov, V. V., Martemianov, M. A., Mashnik, S. G., Matsyuk, M. A., and Turdakina, E. N.

Subjects
PARTICLES (Nuclear physics), DIFFERENTIAL cross sections, NUCLEAR fragmentation, MOMENTUM spectra, CARBON
Abstract

Momentum spectra of all long-lived fragments from 12C fragmentation at 3.5° have been measured. Differential cross sections span up to five orders of its magnitude. The preliminary results are compared with predictions of two transport codes: INCL++ and LAQGSM03.03. Both models give a good description of the data except few items which are discussed. [ABSTRACT FROM AUTHOR]

Published
2017
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29. Light fragments from (C + Be) interactions at 0.6 GeV/nucleon.

Author

ABRAMOV, B. M., ALEKSEEV, P. N., BORODIN, YU. A., BULYOHJOV, S. A., DUKHOVSKOY, I. A., KHANOV, A. I., KRUTENKOVA, A. P., KULIKOV, V. V., MARTEMIANOV, M. A., MASHNIK, S. G., MATSYUK, M. A., TURDAKINA, E. N., and ZARUBIN, P. I.

Subjects
NUCLEAR fragmentation, NUCLEAR reactions, PARTICLES (Nuclear physics), ION-ion collisions, NUCLEAR thermodynamics
Abstract

Nuclear fragments emitted at 3.5° in 12C fragmentation at 0.6 GeV/nucleon have been measured. The spectra obtained are used for testing the predictions of four ion-ion interaction models: INCL++, BC, LAQGSM03.03 and QMD as well as for the comparison with the analytical parametrization in the framework of thermodynamical picture of fragmentation. [ABSTRACT FROM AUTHOR]

Published
2016
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30. Small-angle fragmentation of carbon ions at 0.6 GeV/n: a comparison with models of ion-ion interactions.

Author

Krutenkova, A. P., Abramov, B. M., Alekseev, P. N., Borodin, Yu. A., Bulychjov, S. A., Dukhovskoy, I. A., Khanov, A. I., Kulikov, V. V., Martemianov, M. A., Mashnik, S. G., Matsyuk, M. A., and Turdakina, E. N.

Subjects
ION-ion collisions, COLLISIONS (Nuclear physics), MOMENTUM distributions, ANGULAR momentum (Mechanics), HELIUM isotopes, HYDROGEN isotopes, HEAVY ions
Abstract

Momentum distributions of hydrogen and helium isotopes from 12C fragmentation at 3.5o were measured at 0.6 GeV/nucleon in the FRAGM experiment at ITEP TWA heavy ion accelerator. The fragments were selected by correlated time of flight and dE/dx measurements with a magnetic spectrometer with scintillation counters. The main attention was drawn to the high momentum region where the fragment velocity exceeds the velocity of the projectile nucleus. The momentum spectra of fragments span the region of the fragmentation peak as well as the cumulative region. The differential cross sections cover six orders of magnitude. The distributions measured are compared to the predictions of three ion-ion interaction models: BC, QMD and LAQGSM03.03. The kinetic energy spectra of fragments in the projectile rest frame have an exponential shape with two temperatures, being defined by their slope parameters. [ABSTRACT FROM AUTHOR]

Published
2015
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31. An anomaly in inclusive pion double charge exchange on 16O at about 1GeV

Author

Abramov, B. M., Bulychjov, S A., Dukhovskoy, I. A., Khanov, A. I., Krestnikov, Yu. S., Krutenkova, A. P., Yulikov, V. V., Matsyuk, M. A., Radkevich, I. A., Sutormin, A. I., Turdakina, E. N., and Vicente Vacas, Manuel José

Subjects
Inclusive double charge exchange, UNESCO::FÍSICA::Nucleónica, FÍSICA [UNESCO], Cherenkov counters, UNESCO::FÍSICA, Standard sequencial mechanism, FÍSICA::Nucleónica [UNESCO]
Abstract

The new results on the inclusive double charge exchange (DCX) reaction 16O(π-,π+)X at incident kinetic energy T0=0.75 and 1.15GeV are presented. The data were taken without using Cherentov counters. The new DCX cross sections agree well with the old ones. Both the values are about an order of magnitude larger than the theoretical cross sections calculated for the standard sequential mechanism. Two other approaches wich seem to explain the discrepancy are also briefly reviewed. Vicente Vacas, Manuel Jose, Manuel.J.Vicente@ific.uv.es

Published
1996

32. Nuclear fragmentation study at ITEP heavy ion facility

Author

Abramov, B M, primary, Alekseev, P N, additional, Borodin, Yu A, additional, Bulychjov, S A, additional, Dukhovskoy, I A, additional, Kaidalov, A B, additional, Khanov, A I, additional, Krutenkova, A P, additional, Kulikov, V V, additional, Martemianov, M A, additional, Matsyuk, M A, additional, and Turdakina, E N, additional

Published
2012
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33. Cumulative protons in the Be(C,p) X reaction at 0.2-3.2 GeV/nucleon.

Author

Abramov, B., Alexeev, P., Borodin, Yu., Bulychjov, S., Dukhovskoy, I., Kaidalov, A., Krutenkova, A., Kulikov, V., Martemianov, M., Matsyuk, M., Turdakina, E., and Khanov, A.

Abstract

The spectra of protons were measured in fragmentation of C ions in the cumulative region at energies of 0.2-3.2 GeV/nucleon. The energy dependence of the slope parameters in the obtained spectra was traced. The probability of the existence of two- and three-nucleon clusters in the carbon nucleus was estimated within the model of quark-gluon strings. [ABSTRACT FROM AUTHOR]

Published
2011
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34. Quasielastic Triton Knockout from 6Li and 7Li Nuclei by Intermediate-Energy Pions.

Author

Abramov, B. M., Borodin, Yu. A., Bulychjov, S. A., Dukhovskoy, I. A., Krutenkova, A. P., Kulikov, V. V., Martem'yanov, M. A., Matsuk, M. A., Tarasov, V. E., Turdakina, E. N., and Khanov, A. I.

Subjects
PIONS, QUASIELASTIC light scattering, MAGNETIC spectrometer, LITHIUM, SPECTRUM analysis, PARTICLES (Nuclear physics)
Abstract

Quasielastic triton knockout from 6Li and 7Li nuclei by negative pions with momenta p0 = 0.72 and 0.88 GeV/c was studied in the region of backward pion–triton scattering. The experiment was performed at the Institute of Theoretical and Experimental Physics (ITEP, Moscow) on a 3-m magnetic spectrometer equipped with spark chambers. The momentum distributions of the intranuclear quasitriton motion and the excitation-energy spectra of residual nuclei were obtained. © 2004 MAIK “Nauka / Interperiodica”. [ABSTRACT FROM AUTHOR]

Published
2004
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35. Spectra of Fast π[sup +] Mesons from the π[sup –]A→π[sup +]X Reaction on Oxygen and Lithium Nuclei at 0.59 GeV.

Author

Abramov, B. M., Álvarez-Ruso, L., Borodin, Yu. A., Bulychjov, S. A., Dukhovskoy, I. A., Khanov, A. I., Krutenkova, A. P., Kulikov, V. V., Matsuk, M. A., Radkevich, I. A., Sutormin, A. I., Turdakina, E. N., and Vicente Vacas, M. J.

Subjects
MESONS, NUCLEAR reactions, OXYGEN, LITHIUM
Abstract

The spectra of fast π[sup +] mesons from the π[sup -]A → π[sup +]X reaction on A = [sup 6]Li, [sup 7]Li, and [sup 16]O nuclei at a primary momentum of p[sub 0] = 0.72 GeV/c (T[sub 0] = 0.,59 GeV) are measured at emission-angle values in the range ... = 0°-14°. The results obtained in this way are compared with experimental data taken in other studies at lower energies and with the results of model calculations. The energy dependence of the cross sections and of shadowing effects is analyzed for the reactions in question that occur on lithium isotopes. [ABSTRACT FROM AUTHOR]

Published
2002
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36. Results of search for narrow diproton structures in the pn → ppπ reaction at 1.98 GeV/c.

Author

Abramov, B., Dukhovskoy, I., Fedorets, V., Khanov, A., Krestnikov, Yu, Krutenkova, A., Kulikov, V., Matsyuk, M., Radkevich, I., Starodumov, A., and Sutormin, A.

Abstract

The effective mass spectrum of two protons from the reaction p+ n→ pp+ π ( backward) was investigated. The work was carried out at ITEP using a 3-meter magnet spectrometer and a proton beam of 1.98 GeV/c momentum. Liquid deuterium was used as a target. The presented mass spectrum includes about 34000 events. No statistically significant signals from narrow dibaryons were found in the mass region 1.89-2.17 GeV/ c ; the upper limits on narrow dibaryon production cross-section are given. At a mass of 1.8775 GeV/ c a narrow enhancement was found. A more detailed investigation of the observed phenomenon is needed. [ABSTRACT FROM AUTHOR]

Published
1995
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37. Results of search for narrow diproton structures in thepn→ppπ−reaction at 1.98 GeV/c

Author

Abramov, B., Dukhovskoy, I., Fedorets, V., Khanov, A., Krestnikov, Yu, Krutenkova, A., Kulikov, V., Matsyuk, M., Radkevich, I., Starodumov, A., and Sutormin, A.

Abstract

The effective mass spectrum of two protons from the reactionp+n→pp+π−(backward) was investigated. The work was carried out at ITEP using a 3-meter magnet spectrometer and a proton beam of 1.98GeV/cmomentum. Liquid deuterium was used as a target. The presented mass spectrum includes about 34000 events. No statistically significant signals from narrow dibaryons were found in the mass region 1.89–2.17GeV/c2; the upper limits on narrow dibaryon production cross-section are given. At a mass of 1.8775GeV/c2a narrow enhancement was found. A more detailed investigation of the observed phenomenon is needed.

Published
1995
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38. The Use of Quasielastic Pion–Proton Backward Scattering at 0.7GeV/c for Studying Fermi Motion in Light Nuclei.

Author

Abramov, B. M., Borodin, Yu. A., Bulychjov, S. A., Dukhovskoy, I. A., Krutenkova, A. P., Kulikov, V. V., Matsyuk, M. A., Radkevich, I. A., Turdakina, E. N., and Khanov, A. I.

Subjects
SCATTERING (Physics), PION-pion interactions, NUCLEAR physics
Abstract

The plane-wave approximation was used to examine the proton Fermi-momentum distribution in experiments on quasielastic large-momentum-transfer pion–nucleon scattering in light nuclei [sup 6]Li,[sup 7]Li, and [sup 12]C. It was found that, unlike the (e,e′) reaction, the Fermi-gas model is in poor agreement with experiment, whereas the oscillator model adequately describes the spectrum shape. However, the parameters obtained for these distributions are sizably smaller than those derived from the (e,e′) experiments. This suggests that the plane-wave approach is inadequate and that more complicated theoretical approaches, supposedly allowing for pion–nucleon amplitude modification in nuclear matter, are necessary for the analysis of experimental data. © 2000 MAIK “Nauka / Interperiodica”. [ABSTRACT FROM AUTHOR]

Published
2000
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