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Dive into the research topics where B. Sikora is active.

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Featured researches published by B. Sikora.


Nuclear Physics | 1997

Central collisions of Au on Au at 150, 250 and 400 A·MeV

W. Reisdorf; D. Best; A. Gobbi; N. Herrmann; K. D. Hildenbrand; B. Hong; S. C. Jeong; Y. Leifels; C. Pinkenburg; J. L. Ritman; D. Schüll; U. Sodan; K. M. Teh; G. S. Wang; J. P. Wessels; T. Wienold; J. P. Alard; V. Amouroux; Z. Basrak; N. Bastid; I. Belyaev; L. Berger; J. Biegansky; M. Bini; S. Boussange; A. Buta; R. Čaplar; N. Cindro; J. P. Coffin; P. Crochet

Abstract Collisions of Au on Au at incident energies of 150, 250 and 400 A ·MeV were studied with the FOPI-facility at GSI Darmstadt. Nuclear charge ( Z ⩽ 15) and velocity of the products were detected with full azimuthal acceptance at laboratory angles 1° ⩽ θ lab ⩽ 30°. Isotope separated light charged particles were measured with movable multiple telescopes in an angular range of 6–90°. Central collisions representing about 1% of the reaction cross section were selected by requiring high total transverse energy, but vanishing side flow. The velocity space distributions and yields of the emitted fragments are reported. the data are analysed in terms of a thermal model including radial flow. A comparison with predictions of the quantum molecular model is presented.


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1993

A highly-segmented ΔE-time-of-flight wall as forward detector of the 4π-system for charged particles at the SIS/ESR accelerator

A. Gobbi; J.P. Alard; G. Augustinski; Z. Basrak; N. Bastid; I.M. Belayev; Th. Blaich; P. Boccaccio; R. Bock; S. Boussange; A. Buta; R. Čaplar; C. Cerruti; R.J. Charity; N. Cindro; J.P. Coffin; M. Crouau; F. Daudon; J.F. Devin; P. Dupieux; J. Erö; Z. G. Fan; C. Fayard; P. Fintz; Z. Fodor; L. Fraysse; R. Freifelder; S. Frolov; E. Gimenez; Y. Grigorian

Abstract At the SIS/ESR accelerator facility at GSI in Darmstadt the 4π-detector system FOPI is under construction at present. It is designed for the investigation of central collisions of heavy ions in the energy range up to 2 A GeV. As phase I of this detector a forward wall has been built and used in various experiments. It comprizes a total number of 764 scintillators with an additional shell of 188 thin ΔE -detectors in front of it and covers the full azimuth of the polar angles from 1° to 30°. The velocity and the nuclear charge of the fragments are determined by a combined time-of-flight and ΔE measurement.


Physics Letters B | 2005

Excitation function of elliptic flow in Au+Au collisions and the nuclear matter equation of state

A. Andronic; V. Barret; Z. Basrak; N. Bastid; L. Benabderrahmane; G. Berek; R. Čaplar; E. Cordier; Philippe Crochet; P. Dupieux; M. Dželalija; Z. Fodor; I. Gašparić; Y. Grishkin; O. N. Hartmann; N. Herrmann; K. D. Hildenbrand; B. Hong; J. Kecskemeti; Y. J. Kim; M. Kirejczyk; P. Koczon; M. Korolija; R. Kotte; T. Kress; A. Lebedev; Y. Leifels; X. Lopez; A. Mangiarotti; M. Merschmeyer

Abstract We present measurements of the excitation function of elliptic flow at midrapidity in Auxa0+xa0Au collisions at beam energies from 0.09 to 1.49 GeV per nucleon. For the integral flow, we discuss the interplay between collective expansion and spectator shadowing for three centrality classes. A complete excitation function of transverse momentum dependence of elliptic flow is presented for the first time in this energy range, revealing a rapid change with incident energy below 0.4 A GeV , followed by an almost perfect scaling at the higher energies. The equation of state of compressed nuclear matter is addressed through comparisons to microscopic transport model calculations.


European Physical Journal A | 1995

On the transverse momentum distribution of strange hadrons produced in relativistic heavy ion collisions

J. L. Ritman; N. Herrmann; D. Best; J. P. Alard; V. Amouroux; Nicole Bastid; I. Belyaev; L. Berger; J. Biegansky; A. Buta; R. Čaplar; N. Cindro; J. P. Coffin; P. Crochet; R. Donà; P. Dupieux; M. Dzelalija; P. Fintz; Z. Fodor; A. Genoux-Lubain; A. Gobbi; G. Goebels; G. Guillaume; Y. Grigorian; E. Häfele; K. D. Hildenbrand; S. Hölbling; F. Jundt; J. Kecskemeti; M. Kirejczyk

Particles with strange quark content produced in the system 1.93A·GeV58Ni on58Ni have been investigated at GSI Darmstadt with the FOPI detector system. The correlation of these produced particles was analyzed with respect to the reaction plane.Λ baryons exhibit a very pronounced sideward flow pattern which is qualitatively similar to the proton flow. However, the kaon (K+,Ks0) flow patterns are significantly different from that of the protons, and their form may be useful to restrict theoretical models on the form of the kaon potential in the nuclear medium.


Nuclear Physics | 1997

K+ production in the reaction 58Ni+58Ni at incident energies from 1 to 2 a GeV

D. Best; N. Herrmann; B. Hong; M. Kirejczyk; J. L. Ritman; K. Wisniewski; A. Zhilin; A. Gobbi; K. D. Hildenbrand; Y. Leifels; C. Pinkenburg; W. Reisdorf; D. Schüll; U. Sodan; G. S. Wang; T. Wienold; J. P. Alard; V. Amouroux; N. Bastid; I. Belyaev; G. Berek; J. Biegansky; R. Cherbatchev; J. P. Coffin; P. Crochet; P. Dupieux; Z. Fodor; A. Genoux-Lubain; G. Goebels; G. Guillaume

Abstract Semi-inclusive triple differential multiplicity distributions of positively charged kaons have been measured over a wide range in rapidity and transverse mass for central collisions of 58Ni with 58Ni nuclei. The transverse mass (mt) spectra have been studied as a function of rapidity at a beam energy 1.93 AGeV. The mt distributions of K+ mesons are well described by a single Boltzmann-type function. The spectral slopes are similar to that of the protons indicating that rescattering plays a significant role in the propagation of the kaon. Multiplicity densities have been obtained as a function of rapidity by extrapolating the Boltzmann-type fits to the measured distributions over the remaining phase space. The total K+ meson yield has been determined at beam energies of 1.06, 1.45, and 1.93 A GeV, and is presented in comparison to existing data. The low total yield indicates that the K+ meson can not be explained within a hadro-chemical equilibrium scenario, therefore indicating that the yield does remain sensitive to effects related to its production processes such as the equation of state of nuclear matter and/or modifications to the K+ dispersion relation.Semi-inclusive triple differential multiplicity distributions of positively charged kaons have been measured over a wide range in rapidity and transverse mass for central collisions of


Nuclear Physics | 1995

Evidence for collective expansion in light-particle emission following Au+Au collisions at 100, 150 and 250 A·MeV

G. Poggi; G. Pasquali; M. Bini; P. R. Maurenzig; A. Olmi; N. Taccetti; J. P. Alard; V. Amouroux; Z. Basrak; N. Bastid; I.M. Belayev; L. Berger; Th. Blaich; S. Boussange; A. Buta; R. Čaplar; C. Cerruti; N. Cindro; J. P. Coffin; R. Donà; P. Dupieux; M. Dželalija; J. Erö; Z. G. Fan; P. Fintz; Z. Fodor; L. Fraysse; R. Freifelder; S. Frolov; A. Gobbi

^{58}


Nuclear Physics | 1995

Sideward flow in Au + Au collisions at 400 A.MeV

V. Ramillien; P. Dupieux; J. P. Alard; V. Amouroux; N. Bastid; L. Berger; S. Boussange; L. Fraysse; M. Ibnouzahir; G. Montarou; I. Montbel; P. Pras; Z. Basrak; I.M. Belayev; M. Bini; Th. Blaich; A. Buta; R. Čaplar; C. Cerruti; N. Cindro; J. P. Coffin; R. Donà; J. Erö; Z. G. Fan; P. Fintz; Z. Fodor; R. P. Freifelder; S. Frolov; A. Gobbi; Y. Gregorian

Ni with


European Physical Journal A | 1998

Identification of baryon resonances in central heavy-ion collisions at energies between 1 and 2 AGeV

M. Eskef; D. Pelte; G. Goebels; E. Häfele; N. Herrmann; M. Korolija; Y. Leifels; H. Merlitz; S. Mohren; M. R. Stockmeier; M. Trzaska; J. P. Alard; A. Andronic; Ralf Peter Averbeck; Z. Basrak; N. Bastid; I. Belyaev; D. Best; A. Buta; R. Čaplar; N. Cindro; J. P. Coffin; P. Crochet; P. Dupieux; M. Dželalija; L. Fraysse; Z. Fodor; A. Genoux-Lubain; A. Gobbi; K. D. Hildenbrand

^{58}


Physics Letters B | 1997

Abundance of Δ resonances in 58Ni + 58Ni collisions between 1 and 2 AGeV

B. Hong; N. Herrmann; J. L. Ritman; D. Best; A. Gobbi; K. D. Hildenbrand; M. Kirejczyk; Y. Leifels; C. Pinkenburg; W. Reisdorf; D. Schüll; U. Sodan; O. S. Wang; T. Wienold; J. P. Alard; V. Amouroux; N. Bastid; I. Belyaev; G. Berek; J. Biegansky; A. Buta; J. P. Coffin; P. Crochet; R. Donà; P. Dupieux; M. Eskef; P. Fintz; Z. Fodor; L. Fraysse; A. Genoux-Lubain

Ni nuclei. The transverse mass (


Nuclear Physics | 1997

Out-of-plane emission of nuclear matter in Au+Au collisions between 100 and 800 AMeV

N. Bastid; A. Buta; P. Crochet; P. Dupieux; M. Petrovici; F. Rami; J. P. Alard; V. Amouroux; Z. Basrak; I. Belyaev; D. Best; J. Biegansky; Th. Blaich; R. Čaplar; C. Cerruti; N. Cindro; J. P. Coffin; R. Donà; M. Dželalija; Z. G. Fan; P. Fintz; Z. Fodor; L. Fraysse; R. P. Freifelder; A. Gobbi; G. Guillaume; N. Herrmann; K. D. Hildenbrand; S. Hölbling; B. Hong

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Z. Basrak

Lawrence Berkeley National Laboratory

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Z. Fodor

Hungarian Academy of Sciences

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N. Bastid

Blaise Pascal University

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P. Dupieux

Blaise Pascal University

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K. D. Hildenbrand

GSI Helmholtz Centre for Heavy Ion Research

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A. Gobbi

GSI Helmholtz Centre for Heavy Ion Research

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R. Čaplar

Hungarian Academy of Sciences

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J. P. Alard

Blaise Pascal University

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A. Buta

Lawrence Berkeley National Laboratory

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