作者机构：
[Sa, Ben-Hao; Yan, Yu-Liang] China Inst Atom Energy, POB 275 10, Beijing 102413, Peoples R China.;[Zhou, Dai-Mei; Yang, Chunbin; Sa, Ben-Hao; Yan, Yu-Liang; Cai, Xu] Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.;[Zhou, Dai-Mei; Yang, Chunbin; Sa, Ben-Hao; Yan, Yu-Liang; Cai, Xu] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Limphirat, Ayut; Yan, Yupeng] Suranaree Univ Technol, Sch Phys, Nakhon Ratchasima 30000, Thailand.;[Limphirat, Ayut; Yan, Yupeng] Suranaree Univ Technol, Ctr Excellence High Energy Phys & Astrophys, Nakhon Ratchasima 30000, Thailand.
通讯机构：
[Yan, Yu-Liang] C;China Inst Atom Energy, POB 275 10, Beijing 102413, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys, MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
pp collisions;jet;anti-kt algorithm;PYTHIA model;pp collisions;jet;anti-kt algorithm;PYTHIA model
摘要：
We propose a forward method based on PYTHIA6.4 to study the jet properties in ultra-relativistic pp collisions.In the forward method,the partonic initial states are first generated with PYTHIA6.4 and then hadronized in the Lund string fragmentation model,and finally the hadronic jets are constructed from the created hadrons.Jet properties calculated with the forward method for pp collisions at √s=7 TeV are comparable to those calculated with the usual anti-kt algorithm (backward method) in PYTHIA6.4.The comparison between the backward and forward methods may contribute to the understanding of the partonic origin of jets in the backward method.
摘要：
Scaled factorial moment analysis for the multiplicity distribu- tions of shower particles in the pseudorapidity phase space has been done. An evidence for the presence of dynamical uctuations has been shown for the non-peripheral interactions of28Si+Ag(Br) at 14.6 A GeV/c and 4.5 A GeV/c.The results have been compared with the values obtained from data sample calculated by cascade-evaporation model.
期刊：
EUROPEAN PHYSICAL JOURNAL A,1999年5(4):429-440 ISSN：1434-6001
通讯作者：
Adamovich, MI
作者机构：
PN Lebedev Phys Inst, Moscow 117924, Russia.;Inst High Energy Phys, Alma Ata, Kazakhstan.;Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China.;Inst Space Sci, Bucharest, Romania.;Panjab Univ, Dept Phys, Chandigarh 160014, India.
摘要：
The experimental data on the interactions of 10.6A GeV gold nuclei in nuclear emulsions are analyzed with particular emphasis of target separation interactions and study of critical exponents. Charged fragment moments, conditional moments as well as two and three - body asymmetries of the fast moving. projectile particles are determined in terms of the total charge remaining bound in the multiply charged projectile fragments. Some differences in the average yields of helium nuclei and heavier fragments are observed, which may be attributed to a target effect. However, two and three-body asymmetries and conditional moments indicate that the breakup mechanism of the projectile seems to be independent of target mass. We looked for evidence of critical point observable in finite nuclei by study the resulting charged fragments distributions. We have obtained the values for the critical exponents γ, β and τ and compare our results with those at lower energy experiment (1.0A GeV data). The values suggest that a phase transition like behavior, is observed.
摘要：
The nuclear emulsion was exposed at CERN by the lead projectile at 160 A GeV. The angles between any pair of fragments with Z = 2 - 4 have been measured in the emulsion plane for the events which did not contain heavy fragments. The constant characterizing the normal angle (cp) distribution of the fragment momentum projection onto the emulsion plane with respect to initial projectile momentum Po is found to be sigma(phi) = (0.37 +/- 0.02) mrad. Corresponding value sigma(o) = (121 +/- 6) MeV/c of nucleon momentum distribution in the lead nucleus coincides with that expected from Fermi momentum distribution for this nucleus. The peak in the pair-angle distribution of double-charged fragments, Be-8 --> 2 alpha, is presented for the region of small angles (< 0.1 mrad). The fraction of alpha-particles coming from the decay of the ground state Be-8 is found to be (13 +/- 2)% of their whole number.
会议名称：
XXVIIth International Symposium on Multiparticle Dynamics
会议时间：
SEP 08-12, 1997
会议地点：
INFN, NATL LABS, FRASCATI, ITALY
会议主办单位：
PN Lebedev Phys Inst, Moscow 117924, Russia.^High Energy Phys Inst, Almaty, Kazakhstan.^Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China.^Panjab Univ, Dept Phys, Chandigarh 160014, India.^Hunan Educ Inst, Dept Phys, Changsha, Hunan, Peoples R China.^Joint Nucl Res Inst, Dubna, Russia.^Univ Rajasthan, Dept Phys, Jaipur 302004, Rajasthan, India.^Univ Jammu, Dept Phys, Jammu 180004, India.^Safarik Univ, Dept Nucl Phys & Biophys, Kosice, Slovakia.^Shanxi Normal Univ, Dept Phys, Linfen, Shanxi, Peoples R China.^Univ Lund, Dept Phys, Lund, Sweden.^Univ Marburg, Fachbereich Phys, D-3550 Marburg, Germany.^Univ Washington, Dept Phys, Seattle, WA 98195 USA.^Inst Phys Nucl, Tashkent, Uzbekistan.^Phys Tech Inst, Tashkent, Uzbekistan.^Huazhong Normal Univ, Inst Particle Phys, Wuhan, Hubei, Peoples R China.^St Petersburg Nucl Phys Inst, St Petersburg, Russia.
摘要：
Angular distributions of charged particles produced in O-16 and S-32 collisions with nuclear track emulsion were studied at momenta 4.5 and 200 A GeV/c. Comparison with the angular distributions of charged particles produced in proton-nucleus collisions at the same momentum allows to draw the conclusion, that the angular distributions in nucleus-nucleus collisions can be seen as superposition of the angular distributions in nucleon-nucleus collisions taken at the same impact parameter b(NA), that is mean impact parameter between the participating projectile nucleons and the center of the target nucleus.
摘要：
The complete charge distribution of products from Au nuclei fragmenting in nuclear emulsion at 10.7A GeV has been measured. Multiplicities of produced particles and particles associated with the target source are used to select peripheral and central events. A statistical analysis, based on event-by-event charge distributions, show that a population of subcritical, critical and supercritical events, i.e. a phase transition like behaviour, is observed among peripheral collisions.
摘要：
Using emulsion detectors a transverse-momentum analysis of projectile fragments has been performed in Au induced nuclear interactions at 11.6 A GeV/c. Evidence for collective flow of the projectile fragments has been obtained. Angular distributions of the principal vectors of projectile and target fragments have shown strong azimuthal correlation.
作者机构：
[Adamovich, MI] Inst High Energy Phys, Alma Ata, Kazakhstan.;Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China.;Inst Gravitat & Space Res, Bucharest, Romania.;Panjab Univ, Dept Phys, Chandigarh 160014, India.;Hunan Educ Inst, Dept Phys, Changsha, Hunan, Peoples R China.
通讯机构：
[Adamovich, MI] I;Inst High Energy Phys, Alma Ata, Kazakhstan.
摘要：
We analyse the multifractal structure of moments G(q) in terms of a new variable X on data of (197)AU, S-32, and O-16 induced interactions with emulsion nuclei and Monte Carlo generated samples. The dynamical properties of the produced particles are mapped onto multifractal spectra. We compare In(G) in experimental data of Au-197, S-32, and O-16 with pure statistical fluctuations. It is shown that the stochasticity plays an important role for the G-moments.
作者机构：
ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA.;INST GRAVITAT & SPACE RES, BUCHAREST, ROMANIA.;PANJAB UNIV, DEPT PHYS, CHANDIGARH 160014, INDIA.;HUNAN EDUC INST, DEPT PHYS, CHANGSHA, HUNAN, PEOPLES R CHINA.;JOINT INST NUCL RES DUBNA, LAB HIGH ENERGIES, DUBNA, RUSSIA.
通讯机构：
[Adamovich, MI] I;INST HIGH ENERGY PHYS, ALMATY, KAZAKHSTAN.
摘要：
Angular distributions of projectile-associated He fragments from Pb induced reactions on stationary Pb target at 158 A GeV/c incident momentum are reported. The precision of the angular measurements was about ±0.01 mrad. Two emission components are appearing in the projected angular spectra of the He particles, one representing fragmentation at Fermi momentum scale, while the other one exhibits large transverse momentum transfer. By scaling with the incident momentum the angular spectra of He particles are compared with earlier reported measurements of Au on Au interactions at 11.6 A GeV/c. The pT spectrum of the He particles appears the same for the two cases.
期刊：
EUROPEAN PHYSICAL JOURNAL A,1997年358(3):337-351 ISSN：1434-6001
通讯作者：
Adamovich, MI
作者机构：
INST HIGH ENERGY PHYS,ALMATY,KAZAKHSTAN.;ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA.;PANJAB UNIV,DEPT PHYS,CHANDIGARH 160014,INDIA.;HUNAN EDUC INST,DEPT PHYS,CHANGSHA,PEOPLES R CHINA.;JOINT INST NUCL RES,LAB COMP TECH,DUBNA,RUSSIA.
摘要：
Complex analysis of Gold interaction with photoemulsion nuclei at 10.7 GeV/nucleon has been performed. The data obtained were compared with a modified FRITIOF model which allowance is made for exitation of nuclear residuals (after interaction). A comparison was also made with cascade-evaporation model. Experimental data contradict the CEM supposition of fast resonance decay and complete cascading. The modified FRITIOF model fairly well reproduces experimental observations. According to the model the production mechanism of charged particles must remain unchangable in the 4-200 GeV/n energy range.
期刊：
EUROPEAN PHYSICAL JOURNAL A,1997年359(3):277-290 ISSN：1434-6001
通讯作者：
Adamovich, MI
作者机构：
ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA.;INST GRAVITAT & SPACE RES, BUCHAREST, ROMANIA.;PANJAB UNIV, DEPT PHYS, CHANDIGARH 160014, INDIA.;HUNAN EDUC INST, DEPT PHYS, CHANGSHA, HUNAN, PEOPLES R CHINA.;JOINT NUCL RES INST, LAB COMP TECHN, DUBNA, RUSSIA.
通讯机构：
[Adamovich, MI] I;INST HIGH ENERGY PHYS, Alma Ata, KAZAKHSTAN.
摘要：
Recent results from the EMU-01/12 collaboration are presented for 10.7 GeV/nucleon gold nuclei interactions in emulsion. The distributions of ''bound'' charge (Z(bound;)Z(b3)), multiplicity distributions, fragment correlations and fluctuations are discussed. The data are compared to similar results obtained on the ALADIN setup at 600 MeV/nucleon. It is shown that multifragmentation of gold nuclei at high and intermediate energies has common features. It is also obtained that the IMFs have reduced multiplicity at high energies. The data are analyzed within the scope of the statistical model of multifragmentation. This model requires the following predetermined model ingredients: mass, charge and excitation energy of nuclear residuals. The simple estimation method of these characteristics is proposed in the framework of the Glauber approach. It is shown that the multifragmentation model reproduces qualitatively the present data. A dramatic discrepancy between the predicted and experimental yield of two charged fragments is found. The evolution of transverse momentum of fragments as a function of Z(bound) is presented. It is shown that the model greatly underpredicts the transverse momentum of fragments. It is interpreted as evidence of a strong radial flow of spectator fragments.
作者机构：
HIGH ENERGY PHYS INST, ALMA ATA, KAZAKHSTAN.;ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA.;INST GRAVIATAT & SPACE RES, BUCHAREST, ROMANIA.;PANJAB UNIV, DEPT PHYS, CHANDIGARH 160014, INDIA.;HUNAN EDUC INST, DEPT PHYS, CHANGSHA, HUNAN, PEOPLES R CHINA.
摘要：
Results on charged particle multiplicities, densities and fluctuations from central Pb+Pb interactions at 158 A GeV are presented and discussed. (C) 1997 Elsevier Science B.V.
期刊：
EUROPEAN PHYSICAL JOURNAL C,1997年76(4):659-663 ISSN：1434-6044
通讯作者：
Adamovich, MI
作者机构：
PN Lebedev Phys Inst, Moscow 117924, Russia.;Inst High Energy Phys, KZ-480082 Alma Ata 82, Kazakhstan.;Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China.;Inst Gravitat & Space Res, Bucharest, Romania.;Panjab Univ, Dept Phys, Chandigarh 160014, India.
摘要：
The anomalous behavior of 2-dimensional scaled factorial moments for charged hadrons in nucleus-nucleus collisions is studied in some detail using both mini-bias and central collision data of O-16- and Au-197-Em interactions from EMU01 experiment. The analysis is carried out in terms of Hurst exponents, suggesting the necessity of different partitions in pseudo-rapidity and azimuthal angle. The results can be interpreted tentatively as due to the superposition effect in nucleus-nucleus collisions.
期刊：
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS,1996年22(10):1469-1481 ISSN：0954-3899
通讯作者：
Adamovich, MI
作者机构：
INST HIGH ENERGY PHYS,ALMATY,KAZAKHSTAN.;ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA.;PANJAB UNIV,DEPT PHYS,CHANDIGARH 160014,INDIA.;HUNAN EDUC INST,DEPT PHYS,CHANGSHA,HUNAN,PEOPLES R CHINA.;JOINT INST NUCL RES,LAB HIGH ENERGIES,DUBNA,RUSSIA.
期刊：
EUROPEAN PHYSICAL JOURNAL C,1995年65(3):421-429 ISSN：1434-6044
通讯作者：
ADAMOVICH, MI
作者机构：
ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA.;PANJAB UNIV,DEPT PHYS,CHANDIGARH,PUNJAB,INDIA.;HUNAN EDUC INST,DEPT PHYS,CHANGSHA,PEOPLES R CHINA.;JOINT NUCL RES INST,HIGH ENERGIES LAB,DUBNA,RUSSIA.;UNIV RAJASTHAN,DEPT PHYS,JAIPUR 302004,RAJASTHAN,INDIA.
通讯机构：
[ADAMOVICH, MI] I;INST HIGH ENERGY PHYS,ALMATY,KAZAKHSTAN.
关键词：
Field Theory;Elementary Particle;Quantum Field Theory;Weak Correlation;Impact Parameter
摘要：
The mechanism for producing slow, target associated particles in high energy heavy ion collisions is investigated. It is shown that the same mechanism which was proposed for hadron induced interactions is likely to appear also for heavy-ion reactions. The results indicate however a much weaker correlation between impact parameter and yield of slow particles.
摘要：
Charged particle pseudorapidity density distributions in Au induced reactions in nuclear emulsion at 10.7 A GeV have been measured. In peripheral events the shower particle distribution exhibits a two peak structure while in central collisions it has a Gaussian shape. The spectator protons appear in the second peak in the pseudorapidity spectra and exhibits a broader momentum distribution than expected from Fermi motion. The produced particle yield in central collisions is not substantially different from phenomenological descriptions based on data from O and S induced reactions.
作者机构：
INST HIGH ENERGY PHYS,ALMA ATA,KAZAKHSTAN.;ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA.;INST GRAVITAT & SPACE RES,BUCHAREST,ROMANIA.;PANJAB UNIV,DEPT PHYS,CHANDIGARH 160014,INDIA.;HUNAN EDUC INST,DEPT PHYS,CHANGSHA,PEOPLES R CHINA.
作者机构：
ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA.;PANJAB UNIV,DEPT PHYS,CHANDIGARH 160014,INDIA.;HUNAN EDUC INST,DEPT PHYS,CHANGSHA,PEOPLES R CHINA.;JOINT INST NUCL RES,HIGH ENERGIES LAB,DUBNA,RUSSIA.;UNIV RAJASTHAN,DEPT PHYS,JAIPUR 302004,RAJASTHAN,INDIA.
通讯机构：
[ADAMOVICH, MI] K;KAZAKH ACAD SCI,INST HIGH ENERGY PHYS,ALMA ATA,KAZAKHSTAN.
摘要：
Pseudorapidity density and multiplicity distributions of charged particles produced in heavy-ion collisions at the BNL AGS have been studied. The multiplicity distributions and pseudorapidity distributions of shower particles in Au-induced interactions are presented and compared with model predictions from RQMD, FRITIOF and VENUS. It is shown that the widths of the pseudorapidity distributions of produced particles in central collisions are independent of the interacting system. The results from EMU01 have been compared, and found to agree, with the results from two other heavy-ion experiments, E802 and E814.
期刊：
EUROPEAN PHYSICAL JOURNAL A,1995年351(3):311-316 ISSN：1434-6001
通讯作者：
ADAMOVICH, MI
作者机构：
ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA.;PUNJABI UNIV,DEPT PHYS,CHANDIGARH 160014,INDIA.;HUNAN EDUC INST,DEPT PHYS,CHANGSHA,PEOPLES R CHINA.;JOINT INST NUCL RES,HIGH ENERGIES LAB,DUBNA,RUSSIA.;UNIV RAJASTHAN,DEPT PHYS,JAIPUR 302004,RAJASTHAN,INDIA.
通讯机构：
[ADAMOVICH, MI] I;INST HIGH ENERGY PHYS,ALMATY,KAZAKHSTAN.
摘要：
The fragmentation topology of Si-28 at 3.7 A GeV and 14.6A GeV and S-32 at 200A GeV in reactions with emulsion nuclei is presented. The fragmentation cross sections are very similar at all three energies. A statistical percolation model can qualitatively describe the data for Z greater than or equal to 6. The He production is underestimated and the 3 less than or equal to Z less than or equal to 5 fragments overestimated by this model.
