Nuclear Experiment·nucl-ex
6 papers—2 primary·4 cross-listed·reconstructed*
M. Skurzok🇵🇱 · M. Cargnelli🇦🇹 · C. Curceanu🇮🇹 · R. Del Grande🇮🇹 · L. Fabbietti🇩🇪 · C. Guaraldo🇮🇹 · J. Marton🇦🇹 · P. Moskal🇵🇱 · K. Piscicchia🇮🇹 · A. Scordo🇮🇹 · M. Silarski🇵🇱 · D. L. Sirghi🇮🇹 and 5 other authors
We briefly report on the search for Deeply Bound Kaonic Nuclear States with AMADEUS in the Sigma0 p channel following K- absorption on 12C and outline future perspectives for this work.
Grigory Nigmatkulov (for the STAR Collaboration)🇷🇺
Measurement of femtoscopic correlations in heavy-ion collisions can provide information about spatial and temporal parameters of the particle emission region at kinetic freeze-out. In this work we present the measurement of two-pion and two-kaon femtoscopic correlations in 200 GeV Au+Au collisions at RHIC. The collision centrality and transverse momentum dependence of the three-dimensional radii, , and is discussed.
Oleg Golosov🇷🇺 · Ilya Selyuzhenkov🇷🇺 · Evgeny Kashirin🇷🇺
Anisotropic transverse flow is one of the most important observables in the study of ultra-relativistic nucleus-nucleus collisions. Detector acceptance non-uniformity in the transverse plane introduces substantial bias in the flow analysis dictating the need for specific corrections. The results of flow analysis in Pb-Pb collisions at the beam energy of 40~GeV recorded with the fixed target experiment NA49 at the CERN SPS are presented. The three-subevent technique is used for the differential measurements of the directed and elliptic flow. Corrections for the detector acceptance anisotropy in the transverse plane are applied using an extension of the Qn-Corrections Framework developed originally for the ALICE experiment at the LHC. The results are compared with those previously published by the STAR at RHIC and the NA49 at CERN SPS collaborations. In the future, the developed procedure will be used for the analysis of the new Pb-Pb data collected by the NA61/SHINE experiment at the CERN SPS.
Li Li🇨🇳 · Yingxun Zhang🇨🇳 · Zhuxia Li🇨🇳 · Nan Wang🇨🇳 · Ying Cui🇨🇳 · Jack Winkelbauer
The validity of impact parameter estimation from the multiplicity of charged particles at low-intermediate energies is checked within the framework of ImQMD model. The simulations show that the multiplicity of charged particles cannot estimate the impact parameter of heavy ion collisions very well, especially for central collisions at the beam energies lower than 70 MeV/u due to the large fluctuations of the multiplicity of charged particles. The simulation results for the central collisions defined by the charged particle multiplicity are compared to those by using impact parameter b=2 fm and it shows that the charge distribution for Sn +Sn at 50 MeV/u is different evidently for two cases; and the chosen isospin sensitive observable, the coalescence invariant single neutron to proton yield ratio, reduces less than 15\% for neutron-rich systems Sn +Sn at =50 MeV/u, while the coalescence invariant double neutron to proton yield ratio does not have obvious difference. The sensitivity of the chosen isospin sensitive observables to effective mass splitting is studied for central collisions defined by the multiplicity of charged particles. Our results show that the sensitivity is enhanced for Sn+Sn relative to that for Sn+Sn, and this reaction system should be measured in future experiments to study the effective mass splitting by heavy ion collisions.
O. Bespalova · N. Fedorov · A. Klimochkina · M. Markova · T. Spasskaya · T. Tretyakova
New data on proton and neutron single-particle energies of Si isotopes with neutron number from 12 to 28 as well as occupation probabilities of single particle states of stable isotopes Si near the Fermi energy were obtained by the joint evaluation of the stripping and pick-up reaction data and excited state decay schemes of neighboring nuclei. The evaluated data indicate following features of single-particle structure evolution: persistence of subshell closure with increase, the new magicity of the number , and the conservation of the magic properties of the number in Si isotopic chain. The features were described by the dispersive optical model. The calculation also predicts the weakening of shell closure and demonstrates evolution of bubble-like structure of the proton density distributions in neutron-rich Si isotopes.
E Khyzhniak🇷🇺 · N Ermakov🇷🇺 · G Nigmatkulov🇷🇺
The spatial extents of particle emission source in high-energy collisions can be measured using two-particle femtoscopic correlations. In collisions with small multipli cities, such as proton-proton collisions, correlation functions can be distorted by non-femtos copic effects, for example due to the correlations that caused by energy-momentum conservatio n laws, jets and mini-jets. To estimate these effects, a simulation of p+p collisions at =200 and =510 GeV using PYTHIA 6.4.28 and HIJING 1.383, and p+Au collisions at =200 GeV using HIJING were performed. Charged pion and kaon correlation functions obtained from the Monte Carlo generators and their comparison to the experimental data are p resented.
* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.