共查询到20条相似文献,搜索用时 31 毫秒
1.
Spencer Klein 《Acta Physica Hungarica A》2002,15(3-4):369-379
We report the first observation of the reactions Au + Au → Au + Au + ρ 0 and Au + Au → Au* + Au* + ρ 0 with the STAR detector. The ρ are produced at small perpendicular momentum, as expected if they couple coherently to both nuclei. We discuss models of vector meson production and the correlation with nuclear breakup, and present a fundamental test of quantum mechanics that is possible with the system. 相似文献
2.
The evolution of charged‐particle production in collisions of heavy ions at relativistic energies is investigated as function of centrality in a nonequilibrium‐statistical framework. Precise agreement with recent d + Au and Au + Au data at = 200 GeV is found in a Relativistic Diffusion Model with three sources for particle production. Only the midrapidity source comes very close to local equilibrium, whereas the analyses of the overall pseudorapidity distributions show that the systems remain far from statistical equilibrium. 相似文献
3.
G. Wolschin 《The European Physical Journal A - Hadrons and Nuclei》2006,29(1):113-118
In a Relativistic Diffusion Model (RDM), the evolution of net-proton rapidity spectra with
in heavy systems is proposed as an indicator for local equilibration and longitudinal expansion. The broad midrapidity valley
recently discovered at RHIC in central Au + Au collisions at
= 200 GeV suggests rapid local equilibration which is most likely due to deconfinement, and fast longitudinal expansion.
Rapidity spectra of produced charged hadrons in d + Au and Au + Au systems at RHIC energies and their centrality dependence
are well described in a three-sources RDM. In central collisions, about 19% of the produced particles are in the equilibrated
midrapidity region for d + Au. 相似文献
4.
M. Rosati 《The European Physical Journal C - Particles and Fields》2005,43(1-4):173-178
The PHENIX experiment measured J/
production in pp, d + Au and Au + Au reactions at
= 200 GeV over a wide range of rapidity and transverse momentum. The nuclear modification factor obtained by comparing the
d + Au and pp cross sections as a function of rapidity, is consistent with shadowing of the gluon distribution functions.
J/
production in Au + Au collisions was compared to the production in pp collisions and it was found to be inconsistent with
models that predict strong enhancement relative to binary collision scaling.
Arrival of the final proofs: 29 June 2005
PACS:
25.75-q, 25.75-Dw,
* Deceased
Spokesperson 相似文献
5.
V. Lakshminarayana R. Brock H. Hübel 《Zeitschrift für Physik A Hadrons and Nuclei》1975,274(3):223-225
The level structure of the odd-odd isotopes192Au and194Au was investigated by in-beamγ-ray spectroscopy with the reactionnatIr(α, 3nγ). Several new energy levels could be established in both isotopes. 相似文献
6.
Partlan MD Albergo S Bieser F Brady FP Caccia Z Cebra D Chacon AD Chance J Choi Y Costa S Elliott JB Gilkes ML Hauger JA Hirsch AS Hjort EL Insolia A Justice M Keane D Kintner J Lisa MA Matis HS McMahan M McParland C Olson DL Peilert G Porile NT Potenza R Rai G Rasmussen J Ritter HG Romanski J Romero JL Russo GV Scharenberg RP Scott A Shao Y Srivastava BK Symons TJ Tincknell ML Tuvé C Wang S Warren PG Wieman HH Wolf K 《Physical review letters》1995,75(11):2100-2103
7.
8.
金等离子体中Au51+能级寿命的相对论多组态计算 总被引:5,自引:1,他引:4
根据扩展的相对论多组态 Dirac-Fock理论,采用"多功能相对论原子结构程序(Grasp2) ",选用二参数Fermi有限核模型计算类镍Au51+ 的能级寿命和能级宽度及光谱跃迁波长、跃迁几率和振子强度,计算所得波长值与实验值符合得很好,能级寿命与能级宽度的大小关系符合海森堡的能量与时间测不准原理. 相似文献
9.
激光金等离子体中Au52+静态能级寿命的相对论多组态计算 总被引:3,自引:1,他引:2
根据扩展的相对论多组态Dirac-Fock理论,采用"多功能相对论原子结构程序(GRASP2)",计算类钴Au52+的能级寿命、能级宽度和光谱跃迁波长,计算所得波长值与实验结果符合较好.能级寿命与能级宽度的大小关系符合海森堡的能量与时间测不准原理. 相似文献
10.
Hsi WC Kunde GJ Pochodzalla J Lynch WG Tsang MB Begemann-Blaich ML Bowman DR Charity RJ Cosmo F Ferrero A Gelbke CK Glasmacher T Hofmann T Imme G Iori I Hubele J Kempter J Kreutz P Kunze WD Lindenstruth V Lisa MA Lynen U Mang M Moroni A Müller WF Neumann M Ocker B Ogilvie CA Peaslee GF Raciti G Rosenberger F Sann H Scardaoni R Schüttauf A Schwarz C Seidel W Serfling V Sobotka LG Stuttge L Tomasevic S Trautmann W Tucholski A Williams C Wörner A Zwieglinski B 《Physical review letters》1994,73(25):3367-3370
11.
The present work proposes a theoretical method called ionization dynamics to derive the ionic charge state distribution. Using relativistic quantum mechanics to calculate the energy level lifetime and average ionic lifetime of each ion, the first-order ionization rate constant can be obtained. Based on these data, from the solution of differential equations for consecutive-irreversible ionization reactions, one will be able to derive the ionic charge state distribution.The calculated average positive charge 49.24 of Au48 ~ Au52 and their relative distribution are in good agreement with the results of Lawrence Livermore National Laboratory. 相似文献
12.
197Au Mössbauer measurements have been performed for Au/Ni and Au/Fe metallic superlattices at below 75 K. For Au/Ni superlattices, the area ratio in a spectrum between a superlattice component and that of the pure Au buffer layer has been determined at 25, 50 and 75 K. From the area ratios, it is found that the recoil-free fraction of Au in Au(10 Å)/Ni(10 Å) is larger than that of the bulk Au, suggesting the existence of the supermodulus effect in this superlattice. The197Au Mössbauer spectrum obtained from Au(5 Å)/Fe(8 Å) is entirely magnetic at 16 K, suggesting the existence of a magnetic hyperfine interaction at197Au nuclei through the transferred electron spin polarization. 相似文献
13.
In this paper,we present the centrality,transverse momentum region and rapidity window size dependence of charged particle fluctuation from Relativistic Quantum Molecular Dynamics (RQMD) model.D Q,Γ Q and Φ Q all depend on the rapidity windows we chosen.ν +-,dyn is a promising observable in experiments,it weakly depends on the acceptance.The beam energy dependence of ν +-,dyn has been studied to present baseline prediction for net charge fluctuations in experiments. 相似文献
14.
In this paper,we present the centrality,transverse momentum region and rapidity window size dependence of charged particle fluctuation from Relativistic Quantum Molecular Dynamics (RQMD) model.D Q,Γ Q and Φ Q all depend on the rapidity windows we chosen.ν +-,dyn is a promising observable in experiments,it weakly depends on the acceptance.The beam energy dependence of ν +-,dyn has been studied to present baseline prediction for net charge fluctuations in experiments. 相似文献
15.
K. Efimenko V. Rybka V. Švorčík V. Hnatowicz 《Applied Physics A: Materials Science & Processing》1998,67(5):503-505
Received: 25 January 1998/Accepted: 28 May 1998 相似文献
16.
A. Andronic J. Łukasik W. Reisdorf W. Trautmann 《The European Physical Journal A - Hadrons and Nuclei》2006,30(1):31-46
Excitation functions of flow and stopping observables for the Au+ Au system at energies from 40 to 1500MeV per nucleon are
presented. The systematics were obtained by merging the results of the INDRA and FOPI experiments, both performed at the GSI
facility. The connection to the nuclear equation of state is discussed. 相似文献
17.
Wang S Lisa MA Albergo S Bieser F Brady FP Caccia Z Cebra DA Chacon AD Chance JL Choi Y Costa S Elliott JB Gilkes ML Hauger JA Hirsch AS Hjort EL Insolia A Justice M Keane D Kintner J Lindenstruth V Liu H Matis HS McMahan M McParland C Olson DL Partlan MD Porile NT Potenza R Rai G Rasmussen J Ritter HG Romanski J Romero JL Russo GV Scharenberg RP Scott A Shao Y Srivastava BK Symons TJ Tincknell ML Tuvè C Warren PG Weerasundara D Wieman HH Wolf KL 《Physical review letters》1996,76(21):3911-3914
18.
《Nuclear Physics A》1997,624(4):755-772
Using the FOPI detector at GSI Darmstadt, excitation functions of collective flow components were measured for the Au+Au system, in the reaction plane and out of this plane, at seven incident energies ranging from 100A MeV to 800A MeV. The threshold energies, corresponding to the onset of sideward-flow (balance energy) and squeeze-out effect (transition energy), are extracted from extrapolations of these excitation functions toward lower beam energies for charged products with Z ⩾ 2. The transition energy is found to be larger than the balance energy. The impact parameter dependence of both balance and transition energies, when extrapolated to central collisions, suggests comparable although slightly higher values than the threshold energy for the radial flow. The relevant parameter seems to be the energy deposited into the system in order to overcome the attractive nuclear forces. 相似文献
19.
Beavis D Bennett MJ Carroll JB Chiba J Chikanian A Crawford H Cronqvist M Dardenne Y Debbe R Doke T Engelage J Greiner L Hallman TJ Hayano RS Heckman HH Kashiwagi T Kikuchi J Kumar S Kuo C Lindstrom PJ Mitchell JW Nagamiya S Nagle JL Pope JK Stankus P Tanaka KH Welsh RC Zhan W 《Physical review letters》1995,75(20):3633-3636
20.
激光金等离子体中Au47+、Au53+的离子结构和光谱分析 总被引:6,自引:1,他引:5
根据扩展的相对论多组态狄拉克-福克(Dirac-Fock)理论,采用“多功能相对论原子结构程序(GRASP^2)”,考虑量子电动力学(QED)效应和布雷特(Breit)修正,选用二参量费米有限核电荷分布和扩展平均能级模型,并考虑组态问的相互作用和电偶极跃迁,计算了类锗Au^47+、类铁Au^53+的跃迁波长,跃迁几率和振子强度,计算的波长与实验值符合较好。研究表明,在类锗^47+、类铁Au^53+的跃迁中,3d-4f是一条较强的跃迁通道。计算所得的波长值对金等离子体的能级寿命、电荷态分布和平均电离度研究有一定的参考价值。 相似文献