HEPData Search

Multiplicities of neutrons and light charged particles associated with central collisions have been measured in the energy range 27–77 MeV/u for the systems 40 Ar+ 197 Au, 232 Th. The experiments demonstrate the occurrence of a saturation of the thermal energy deposited in the system around 650 MeV, corresponding to a constant internal temperature close to 5 MeV.

6 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Search for shock waves in central interactions of carbon nuclei with copper and lead nuclei at 4.5 GeV/c per nucleon

Anikina, M.Kh. ; Vardenga, G.L. ; Golokhvastov, A.I. ; et al.

Yad.Fiz. 35 (1982) 105-107, 1982.

Inspire Record 178205 DOI 10.17182/hepdata.39680

Experimental data on angular distributions of secondaries in central interactions of carbon nuclei (4.5 GeV/c per nucleon) with copper and lead nuclei are given. Experiment was carried out on incident beam of synchrophasotron. Secondary particles are detected with counters. Angle between the axis of these counters and beam directions varies from 15 to 90 degrees. Target was oriented relative to the beam so, that absorption of particles in it escaping at an angle of 60 degrees may be minimum. This position does not change during measurements. Target thicknesses are the following: copper - 0.92 mm, lead -1.0 mm. At the 3-5% accuracy of measurements within 15-90 deg angle range to the beam direction no anomaly in angular distribution has been discovered which could serve as an evidence of shock wave appearance

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

ADMIXTURE OF PROTONS WITH MOMENTUM > 550 MEV AND PIONS WITH MOMENTUM > 100 MEV IS ABOUT 15 PCT.

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

Poggi, G. ; Pasquali, G. ; Bini, M. ; et al.

Nucl.Phys.A 586 (1995) 755-776, 1995.

Inspire Record 1367235 DOI 10.17182/hepdata.36519

Light-particle emission from Au+Au collisions has been studied in the bombarding-energy range 100-250 A·MeV, using DeltaE- ER telescopes in coincidence with the FOPI detector in its phase I configuration. Center-of-mass energy spectra have been measured for Z = 1,2 isotopes emitted in central collisions at CM polar angles between 60° and 90°. Evidence for a collective expansion is reported, on the basis of the mean kinetic energies of hydrogen isotopes. Comparison is presented with statistical calculations (WIX code). For CM kinetic energy spectra, fair agreement is found between data and a recently developed transport model.

6 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Longitudinal flow from 2-A-GeV to 8-A-GeV Au + Au collisions at the Brookhaven AGS.

The E895 collaboration Klay, J.L. ; Ajitanand, N.N. ; Alexander, J.M. ; et al.

Phys.Rev.Lett. 88 (2002) 102301, 2002.

Inspire Record 566271 DOI 10.17182/hepdata.2868

Rapidity distributions of protons from central $^{197}$Au + $^{197}$Au collisions measured by the E895 Collaboration in the energy range from 2 to 8 AGeV at the Brookhaven AGS are presented. Longitudinal flow parameters derived using a thermal model including collective longitudinal expansion are extracted from these distributions. The results show an approximately linear increase in the longitudinal flow velocity, $<\beta\gamma>_{L}$, as a function of the logarithm of beam energy.

93 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Analyzing the features of pi- mesons and protons from A C interactions at a momentum of p = 4.2-GeV/c per projectile nucleon on the basis of the FRITIOF model.

Baatar, T. ; Bondarenko, A.I. ; Bondarenko, R.A. ; et al.

Phys.Atom.Nucl. 63 (2000) 839-844, 2000.

Inspire Record 533011 DOI 10.17182/hepdata.17089

The mean multiplicities of π− mesons and protons originating from pC, dC, αC, and CC interactions at a momentum of p=4.2 GeV/c per projectile nucleon and the distributions of these particles in kinematical variables are presented. These experimental distributions are compared with the corresponding predictions obtained on the basis of the FRITIOF model. It is shown that the FRITIOF version used in the present analysis describes satisfactorily our experimental data.

16 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Centrality dependence of pi+-, K+-, p and anti-p production from s(NN)**(1/2) = 130-GeV Au + Au collisions at RHIC.

The PHENIX collaboration Adcox, K. ; Adler, S.S. ; Ajitanand, N.N. ; et al.

Phys.Rev.Lett. 88 (2002) 242301, 2002.

Inspire Record 568437 DOI 10.17182/hepdata.19421

Identified pi^[+/-] K^[+/-], p and p-bar transverse momentum spectra at mid-rapidity in sqrt(s_NN)=130 GeV Au-Au collisions were measured by the PHENIX experiment at RHIC as a function of collision centrality. Average transverse momenta increase with the number of participating nucleons in a similar way for all particle species. The multiplicity densities scale faster than the number of participating nucleons. Kaon and nucleon yields per participant increase faster than the pion yields. In central collisions at high transverse momenta (p_T greater than 2 GeV/c), anti-proton and proton yields are comparable to the pion yields.

21 data tables

Table 1

Transverse momentum spectra for PI+ in the midrapidity range for the centrality region 0 to 5 PCT. Errors are combined statistical and systematics.

Table 2

Transverse momentum spectra for PI- in the midrapidity range for the centrality region 0 to 5 PCT. Errors are combined statistical and systematics.

Table 3

Transverse momentum spectra for K+ in the midrapidity range for the centrality region 0 to 5 PCT. Errors are combined statistical and systematics.

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Proton emission in Au+Au collisions at 6, 8, and 10.8 GeV/nucleon

Back, B.B. ; Betts, R.R. ; Chang, J. ; et al.

Phys.Rev.C 66 (2002) 054901, 2002.

Inspire Record 602292 DOI 10.17182/hepdata.25396

Transverse mass spectra of protons emitted in Au+Au collisions at beam energies of 6, 8, and 10.8 GeV/nucleon have been measured as a function of collision centrality over a rapidity range 0.5<ylab<1.5. The spectra are well reproduced by Boltzmann distributions over the measured transverse mass region, which allows for extrapolation of the data to derive the rapidity density and apparent temperature of the emitting source. The shapes of the rapidity distributions suggest significant transparency or substantial longitudinal expansion in even the most central collisions at all three beam energies. The data are analyzed within a simple thermal source plus longitudinal expansion model.

15 data tables

Table 1

The inverse slope, mean transverse mass and rapidity density values for centrality 0 to 5 PCT for 6 GeV/nucleon collisions. Statistical errors only.

Table 2

The inverse slope, mean transverse mass and rapidity density values for centrality 5 to 12 PCT for 6 GeV/nucleon collisions. Statistical errors only.

Table 3

The inverse slope, mean transverse mass and rapidity density values for centrality 12 to 23 PCT for 6 GeV/nucleon collisions. Statistical errors only.

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Ratios of charged antiparticles to particles near mid-rapidity in Au + Au collisions at s(N N)**(1/2) = 130-GeV.

The PHOBOS collaboration Back, B.B. ; Baker, M.D. ; Barton, D.S. ; et al.

Phys.Rev.Lett. 87 (2001) 102301, 2001.

Inspire Record 555572 DOI 10.17182/hepdata.41707

We have measured the ratios of antiparticles to particles for charged pions, kaons and protons near mid-rapidity in central Au+Au collisions at sqrt(s_NN) = 130 GeV. For protons, we observe pbar/p = 0.60 +/- 0.04 (stat.) +/- 0.06 (syst.) in the transverse momentum range 0.15 < p_T < 1.0 GeV/c. This leads to an estimate of the baryo-chemical potential mu_B of 45 MeV, a factor of 5-6 smaller than in central Pb+Pb collisions at sqrt(s_NN) = 17.2 GeV.

1 data table

Table 1

130 GeV is sqrt(S) per nucleon-nucleon collision.

Measurements of light nuclei production in 11.5-A-GeV/c Au + Pb heavy-ion collisions.

The E864 collaboration Armstrong, T.A. ; Barish, K.N. ; Batsouli, S. ; et al.

Phys.Rev.C 61 (2000) 064908, 2000.

Inspire Record 525664 DOI 10.17182/hepdata.25465

We report on measurements by the E864 experiment at the BNL-AGS of the yields of light nuclei in collisions of Au(197) with beam momentum of 11.5 A GeV/c on targets of Pb(208) and Pt(197). The yields are reported for nuclei with baryon number A=1 up to A=7, and typically cover a rapidity range from y(cm) to y(cm)+1 and a transverse momentum range of approximately 0.1 < p(T)/A < 0.5 GeV/c. We calculate coalescence scale factors B(A) from which we extract model dependent source dimensions and collective flow velocities. We also examine the dependences of the yields on baryon number, spin, and isospin of the produced nuclei.

14 data tables

Table 1

10 pct most central collisions.

Table 2

10 to 38 pct most central collisions.

Table 3

38 to 66 pct most central collisions.

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Kaon and proton ratios from central Pb + Pb collisions at the CERN SPS.

The NA44 collaboration Kaneta, M. ; Bearden, I.G. ; Bøggild, H. ; et al.

Nucl.Phys.A 638 (1998) 419-422, 1998.

Inspire Record 481886 DOI 10.17182/hepdata.36250

K − /K + and p ¯ / p ratios measured in 158 A·GeV Pb+Pb collisions are shown as a function of transverse momentum P T and centrality in top 8.5% central region. Little centrality dependence of the K − / K + and p ¯ / p ratios is observed. The transverse mass m T distribution and dN/dy of K + , K − , p and p ¯ around mid-rapidity are obtained. The temperature T ch and the chemical potentials for both light and strange quarks (μ q , μ s ) at chemical freeze-out are determined by applying simple thermodynamical model to the present data. The resultant μ q , μ s and T ch are compared with those obtained from similar analysis of SPS S+A and AGS Si+A data. The chemical freeze-out temperature T ch at CERN energies is higher than thermal freeze-out temperature T fo which is extracted from m T distribution of charged hadrons. At AGS energies T ch is close to T fo .

2 data tables

Table 1

Data obtained from the fit of MT spectra.

Table 2

Data obtained from the fit of MT spectra.

Multiplicity of secondary charged hadrons as a function of the number of interacting protons in (p,d,He,C)Ta collisions at an incident momentum of 2.3-GeV/c per nucleon.

Garsevanishvili, V.R. ; Dzhalaganiya, T.R. ; Kuratashvili, G.O. ; et al.

Phys.Atom.Nucl. 61 (1998) 595-597, 1998.

Inspire Record 474517 DOI 10.17182/hepdata.17122

None

2 data tables

Table 1

No description provided.

Table 2

Interacting protons.

Charged particle production in S S collisions at 200-GeV/c per nucleon

The WA94 collaboration Andrighetto, A. ; Antinori, F. ; Bayes, A.C. ; et al.

Phys.Lett.B 412 (1997) 148-154, 1997.

Inspire Record 460283 DOI 10.17182/hepdata.28242

Charged particle production in central S-S collisions at 200 GeV/ c per nucleon has been studied by the WA94 experiment at the CERN-SPS. Particle identification has been provided by the Omega RICH, while a silicon telescope in the Omega spectrometer and an array of MultiWire Proportional Chambers have been used to trace particles through the RICH detector. Production ratios and transverse mass spectra for π ± , K ± and p( p ) at central rapidity and p T > 1.3 GeV/ c are presented.

3 data tables

Table 1

Distributions are fitted with (1/MT**1.5)*DSIG/DMT = CONST*EXP(-MT/SLOPE).

Table 2

1.54 GeV ratio is calculated from the fit to the MT distribution.

Table 3

1.54 GeV ratio is calculated from the fit to the MT distribution.

Pion and proton production in proton tungsten and sulphur tungsten interactions at 200-GeV/c per nucleon

The WA85 collaboration Antinori, F. ; Barnes, R.P. ; Bayes, A.C. ; et al.

Phys.Lett.B 412 (1997) 407-413, 1997.

Inspire Record 459722 DOI 10.17182/hepdata.28265

Production of charged particles identified by a multi cell threshold Čerenkov counter in proton-tungsten and central sulphur-tungsten collisions at 200 GeV/ c per nucleon is discussed. The π ± , p and p production ratios and transverse mass spectra at central rapidity and p T > 0.6 GeV/ c are presented and compared with results from other experiments at the same beam energy.

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

The slope evaluated from the D(N)/D(MT)/(MT**1.5) distribution (denoted as D(N)/D(MT)).

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Classical tests for statistical evaporation at 680 MeV Ar-40 + natural Ag

Gelderloos, C.J. ; Alexander, John M. ; Boger, J. ; et al.

Phys.Rev.C 54 (1996) 3056-3061, 1996.

Inspire Record 433950 DOI 10.17182/hepdata.25739

Measurements of the partial linear momentum transfer and production cross sections for light charged particles are reported for the reaction 680 MeV Ar40+natAg. From examination of light charged particle invariant cross section maps and comparison of experimental angular distributions and energy spectra to a reaction kinematics simulation, an average value of 85% linear momentum transfer is deduced, with a spin range of (0–75)ħ. Integration over energy and angle yields single and coincident light charged particle production cross sections. © 1996 The American Physical Society.

1 data table

Table 1

No description provided.

Hadron yields and hadron spectra from the NA49 experiment

The NA49 collaboration Jones, P.G. ; Afanasiev, S.V. ; Alber, T. ; et al.

Nucl.Phys.A 610 (1996) 188C-199C, 1996.

Inspire Record 432742 DOI 10.17182/hepdata.36468

Preliminary inclusive spectra of negative hadrons, net protons and neutral strange particles are presented, measured by the NA49 experiment in central Pb+Pb collisions at 158 GeV per nucleon. Comparison of their yields with those from the lighter S+S system suggests that the yields scale approximately with the number of participating nucleons.

4 data tables

Table 1

CENTRAL COLLISIONS, PRELIMINARY DATA.

Table 2

CENTRAL COLLISIONS, PRELIMINARY DATA.

Table 3

CENTRAL COLLISIONS, PRELIMINARY DATA.

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Hadron distributions: Recent results from the CERN experiment NA44

The NA44 collaboration Xu, Nu ; Bearden, I.G. ; Bøggild, H. ; et al.

Nucl.Phys.A 610 (1996) 175C-187C, 1996.

Inspire Record 432743 DOI 10.17182/hepdata.36469

Proton distributions at midrapidity have been measured for 158A·GeV Pb+Pb collisions in the focusing spectrometer experiment NA44 at CERN. A high degree of nuclear stopping is found in the truly heavy ion collisions. Systematic results of single particle transverse momentum distributions of pions, kaons, and protons, of 200A·GeV S+S and 158A·GeV Pb+Pb central collisions will be addressed within the context of thermalization. By comparing these data with thermal and transport models, freeze-out parameters such as the temperature parameter T fo and mean collective flow velocity 〈β〉 are extracted. Preliminary results of the particle ratios of K − K + and p p are discussed in the context of cascade models of RQMD and VENUS.

1 data table

Table 1

CENTRAL COLLISIONS: SIG(TRIG)/SIG(GEOM)=10%.

Collective expansion in high energy heavy ion collisions.

The NA44 collaboration Bearden, I.G. ; Boggild, H. ; Boissevain, J. ; et al.

Phys.Rev.Lett. 78 (1997) 2080-2083, 1997.

Inspire Record 426801 DOI 10.17182/hepdata.52345

Transverse mass spectra of pions, kaons, and protons from the symmetric heavy-ion collisions 200 A GeV S+S and 158 A GeV Pb+Pb, measured in the NA44 focusing spectrometer at CERN, are presented. The mass dependence of the slope parameters provides evidence of collective transverse flow from expansion of the system in heavy-ion induced central collisions.

3 data tables

Table 1

(1/MT)*d(N)/d(MT) = A *exp(-MT/SLOPE).

Table 2

(1/MT)*d(N)/d(MT) = A *exp(-MT/SLOPE).

Table 3

The SLOPE from the parameterization of (1/MT)*d(N)/d(MT) = A*exp(-MT/SLOPE)is fitted as follows SLOPE = CONST(C=1) + M(hadron)*CONST(C=2)**2.

Strangelet search and light nucleus production in relativistic Si + Pt and Au + Pt collisions

The E886 collaboration Rusek, A. ; Bassalleck, B. ; Berdoz, A. ; et al.

Phys.Rev.C 54 (1996) R15-R19, 1996.

Inspire Record 429741 DOI 10.17182/hepdata.25801

A strangelet search in Si+Pt and Au+Pt collisions at alternating-gradient synchrotron (AGS) energies, using a focusing spectrometer, sensitive to mass per charge of 3-14 GeV/c2 was conducted during the 1992 and 1993 heavy ion runs at the AGS. The null results thereof are presented as upper limits on the invariant production cross section, in the range of 10−5-10−4 mb c3/GeV2, and model dependent sensitivity limits in the range of 10−7-10−5 per collision. Measurements of the production cross sections of several nonstrange nuclear systems, from p to Be7 and Li8, the background of the strangelet search, are also presented.

1 data table

Table 1

No description provided.

Composite particle production in relativistic Au + Pt, Si + Pt, and p + Pt collisions

The E886 collaboration Saito, N. ; Bassalleck, B. ; Burger, T. ; et al.

Phys.Rev.C 49 (1994) 3211-3218, 1994.

Inspire Record 383739 DOI 10.17182/hepdata.25998

Recently, highly relativistic Au beams have become available at the Brookhaven National Laboratory, Alternating Gradient Synchrotron. Inclusive production cross sections for composite particles, d, t, He3, and He4, in 11.5A GeV/c Au+Pt collisions have been measured using a beam line spectrometer. For comparison, composite particle production was also measured in Si+Pt and p+Pt collisions at similar beam momenta per nucleon (14.6A GeV/c and 12.9 GeV/c, respectively). The projectile dependence of the production cross section for each composite particle has been fitted to Aprojα. The parameter α can be described by a single function of the mass number and the momentum per nucleon of the produced particle. Additionally, the data are well described by momentum-space coalescence. Comparisons with similar analysis of Bevalac A+A data are made. The coalescence radii extracted from momentum-space coalescence fits are used to determine reaction volumes (‘‘source size’’) within the context of the Sato-Yazaki model.

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

The Temperatures of protons and pi- mesons in central nucleus-nucleus interactions at a momentum of 4.5-GeV/c per incident nucleon

Chkhaidze, L. ; Dzhobava, T. ; Kharkhelauri, L. ; et al.

Z.Phys.C 54 (1992) 179-183, 1992.

Inspire Record 339571 DOI 10.17182/hepdata.14709

An estimate of the temperature of protons andπ− mesons in central He−Li, He−C, C−C, C−Ne, C−Cu, C−Pb, O−Pb, Mg−Mg interactions is presented. The results indicate an increase of the proton temperature with increasing mass numbers of projectile and target nuclei (Ap,AT) fromTp=(118±3) MeV for He−Li toTp=(141±2) MeV for C−Pb. The temperature ofπ− mesons does not depend onAP,AT andTπ≃95 MeV. A satisfactory fit forπ− mesons in C−Cu, C−Pb, O−Pb, Mg−Mg collisions can be achieved by using a form involving two temperatures,T1 andT2. The relative yield of the high temperature component (T2) is ≅24% for C−Cu, C−Pb, and Mg−Mg interactions. The observed results forTP in C−Ne, C−Cu and C−Pb collisions are consistent with the prediction of the thermodynamic hagedorn model.

4 data tables

Table 1

for C-CU and C-PB YRAP=0.3-1.7.

Table 2

THE D(N)/D(PT) distribution has been fitted by the form: PT*ET*K1(SLOPE*ET), where K1 is Mac-Donaldis function. for C-CU and C-PB YRAP=0.3-1.7.

Table 3

No description provided.

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Charged hadron distributions in p A and A-A collisions at the CERN SPS

The NA44 collaboration Dodd, Jeremy ; Bøggild, H. ; Boissevain, J. ; et al.

Nucl.Phys.A 590 (1995) 523C-526C, 1995.

Inspire Record 407678 DOI 10.17182/hepdata.36504

Single particle distributions of π ± , K ± , p , p and d near mid-rapidity from 450 GeV/c p A and 200 GeV/c per nucleon SA collisions are presented. Inverse slope parameters are extracted from the transverse mass spectra, and examined for indications of collective phenomena. Proton and antiproton yields are determined for different projectile-target combinations. First results from 160 GeV/c per nucleon PbPb collisions are presented.

2 data tables

Table 1

No description provided.

Table 2

PRELIMINARY DATA FOR CENTRAL EVENTS.

Recent results from NA44 and a review of HBT

The NA44 collaboration Jacak, B.V. ; Boggild, H. ; Boissevain, J. ; et al.

Nucl.Phys.A 590 (1995) 215C-232C, 1995.

Inspire Record 407654 DOI 10.17182/hepdata.36517

None

1 data table

Table 1

PRELIMINARY DATA FOR CENTRAL EVENTS.

Rapidity distributions of protons in (p, d, alpha, C) C interactions at 4.2-GeV/c per nucleon

Bekmirzaev, R.N. ; Kladnitskaya, E.N. ; Muminov, M.M. ; et al.

Phys.Atom.Nucl. 58 (1995) 1548-1554, 1995.

Inspire Record 382325 DOI 10.17182/hepdata.38665

None

7 data tables

Table 1

ASYM is defined as follows: ASYM = (SIG(YRAP(P=3,RF=LAB)<1.1) - (SIG(YRAP(P=3,RF=LAB)>1.1)) / (SIG(YRAP(P=3,RF=LAB)<1.1)+ SIG(YRAP(P=3,RF=LAB)>1.1)).

Table 2

ASYM is defined as follows: ASYM = (SIG(YRAP(P=3,RF=LAB)<1.1) - (SIG(YRAP( P=3,RF=LAB)>1.1)) / (SIG(YRAP(P=3,RF=LAB)<1.1)+SIG(YRAP(P=3,RF=LAB)>1.1)).

Table 3

ASYM is defined as follows: ASYM = (SIG(YRAP(P=3,RF=LAB)<1.1) - (SIG(YRAP( P=3,RF=LAB)>1.1)) / (SIG(YRAP(P=3,RF=LAB)<1.1)+SIG(YRAP(P=3,RF=LAB)>1.1)).

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Montarou, G. ; Marroncle, J. ; Alard, J.P. ; et al.

Phys.Rev.C 47 (1993) 2764-2781, 1993.

Inspire Record 362233 DOI 10.17182/hepdata.26046

The results of intranuclear cascade calculations (ideal gas with two-body collisions and no mean field), complemented by a simple percolation procedure, are compared with experimental data on protons and light nuclear fragments (d, t, He3, and He4) measured in 400 and 800 MeV/nucleon Ne+Nb collisions using a large solid angle detector. The model reproduces quite well global experimental observables like nuclear fragment multiplicity distributions or production cross sections, and nuclear fragment to proton ratios. For rapidity distributions the best agreement occurs for peripheral reactions. Transverse momentum analysis confirms once again that the cascade, although being a microscopic approach, gives too small a collective flow, the best agreement being reached for Z=2 nuclear fragments. Nevertheless these comparisons are encouraging for further improvements of the model. Moreover, such an approach is easy to extend to any other models that could calculate the nucleon phase space distribution after the compression stage of the reaction, when light nuclear fragments emitted at large angles are constructed from percolation.

2 data tables

Table 1

No description provided.

Table 2

No description provided.