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The simultaneous measurement of the isotopic fission-fragment yields and fission-fragment velocities of $^{239}$U has been performed for the first time. The $^{239}$U fissioning system was produced in one-neutron transfer reactions between…

Within the isospin- and momentum-dependent transport model IBUU11, we examine the relativistic retardation effects of electrical fields on the $\pi^{-}/\pi^{+}$ ratio and neutron-proton differential transverse flow in heavy-ion collisions…

核理论 · 物理学 2018-04-09 Gao-Feng Wei , Bao-An Li , Gao-Chan Yong , Li Ou , Xin-Wei Cao , Xu-Yang Liu

Elliptical energy flow patterns in non-central Au(11.7AGeV) on Au reactions have been studied employing the RQMD model. The strength of these azimuthal asymmetries is calculated comparing the results in two different modes of RQMD (mean…

核理论 · 物理学 2009-10-30 H. Sorge

While relativistic heavy-ion collisions become an alternative way of studying nucleus structure, the accurate extraction of nucleus structure could be hampered by the uncertainty of nucleon size, and the latter has attracted people's…

核理论 · 物理学 2025-05-14 Hai-Cheng Wang , Song-Jie Li , Jun Xu , Zhong-Zhou Ren

Event-by-event reconstruction of the collision geometry using some incarnation of the Glauber-model is a widely accepted method in studying heavy ion collisions. While there is no known problem with the procedure when applied to the…

核实验 · 物理学 2015-06-23 G. David

The elliptic-flow ratio of neutrons with respect to protons in reactions of neutron rich heavy-ions systems at intermediate energies has been proposed as an observable sensitive to the strength of the symmetry term in the nuclear Equation…

To describe ultrarelativistic heavy-ion collisions we construct a three-fluid hydrodynamical model. In contrast to one-fluid hydrodynamics, it accounts for the finite stopping power of nuclear matter, i.e. for nonequilibrium effects in the…

核理论 · 物理学 2016-09-08 J. Brachmann , A. Dumitru , J. A. Maruhn , H. Stöcker , W. Greiner , D. H. Rischke

We studied the centrality selection effect on cumulants (up to fourth order) and the cumulants ratios of net-proton multiplicity distributions in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 7.7, 19.6 and 200 GeV from UrQMD model. The…

核实验 · 物理学 2020-07-20 Arghya Chatterjee , Yu Zhang , Jingdong Zeng , Nihar Ranjan Sahoo , Xiaofeng Luo

Background: The understanding of the impact of initial deformation and collision orientation on quasi-fission and fusion-fission reactions remains incomplete. Purpose: This article aims to explore how the orientation of deformed nuclei…

核理论 · 物理学 2024-02-27 Yujie Feng , Huizi Liu , Yingge Huang , Fuchang Gu , Erxi Xiao , Xin Lei , Hui Wang , Jiali Huang , Long Zhu , Jun Su

KM3NeT has recently reported the detection of a very high-energy neutrino event, while IceCube has previously set upper limits on the differential neutrino flux above 100 PeV but has yet to observe a neutrino event with an energy comparable…

高能天体物理现象 · 物理学 2025-07-17 Maxwell Nakos , Aske Rosted , Lu Lu

To explore the strength, isospin dependence, and density dependence of the in-medium spin-orbit coupling that is poorly known but relevant for understanding the structure of rare isotopes, the nucleon spin up-down differential transverse…

核理论 · 物理学 2014-06-19 Yin Xia , Jun Xu , Bao-An Li , Wen-Qing Shen

Non-trivial geometrical effects in relativistic central collisions of deformed nuclei are studied using a simple version of optical Glauber model. For very small impact parameters large centrality and eccentricity fluctuations are observed.…

核理论 · 物理学 2008-11-26 Peter Filip

Purported signatures of collective dynamics in small systems like proton-proton (pp) or proton-nucleus (p-A) collisions still lack unambiguous understanding. Despite the qualitative and/or quantitative agreement of the data to hydrodynamic…

高能物理 - 唯象学 · 物理学 2020-10-07 Somnath Kar , Subikash Choudhury , Xiaoming Zhang , Daicui Zhou

Possibility of observing the Mott momentum in the distribution of the deuterons produced in the process $p + n \to d + \gamma$, in the first stage of a nuclear reaction is presented. The correlation of a hard photon with a deuteron allows…

核理论 · 物理学 2009-10-31 P. Bozek , P. Danielewicz , K. Gudima , M. Ploszajczak

To interpret the measurements in heavy-ion collisions at the Relativistic Heavy-Ion Collider (RHIC) it is crucial to understand the initial state of the colliding gold (Au) nuclei. The parton distribution in Au nuclei is modified compared…

核实验 · 物理学 2019-08-13 Baldo Sahlmueller

Azimuthal distributions of $\eta$ and $\pi^{0}$ mesons emitted at midrapidity in collisions of 1.9 AGeV $^{58}$Ni+$^{58}$Ni and 2 AGeV $^{40}$Ca+$^{nat}$Ca are studied as a function of the number of projectile-like spectator nucleons. The…

This letter explains a new, highly sensitive method for the detection of neutrons, which uses the T$_{1/2}=845$ ns delay in the decay of $^{128}$I at the 137.8 keV energy level, resulting from the capture of thermal neutrons by iodine…

仪器与探测器 · 物理学 2017-03-08 E. Yakushev , S. Rozov , A. Drokhlyansky , D. Filosofov , Z. Kalaninova , V. Timkin , D. Ponomarev

We demonstrate that a new type of analysis in heavy-ion collisions, based on an event-by-event analysis of the transverse momentum distribution, allows us to obtain information on secondary interactions and collective behaviour that is not…

高能物理 - 唯象学 · 物理学 2011-09-13 Marek Gazdzicki , Andrei Leonidov , Gunther Roland

Proton elliptic flow is studied as a function of impact-parameter $b$, for two transverse momentum cuts in 2 - 6 AGeV Au + Au collisions. The elliptic flow shows an essentially linear dependence on b (for $1.5 < b < 8$ fm) with a negative…

核实验 · 物理学 2008-11-26 E895 Collaboration , P. Danielewicz

Recent data from p+p and p+Pb collisions at the Large Hadron Collider (LHC), and d+Au and $^3$He+Au collisions at the Relativistic Heavy Ion Collider (RHIC) reveal patterns that---when observed in the collision of heavy nuclei---are…

核实验 · 物理学 2015-11-11 J. D. Orjuela Koop , A. Adare , D. McGlinchey , J. L. Nagle