Description of (Hyper-)Fragments in Hadron-Induced Reactions

Symmetry ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1887
Author(s):  
Theodoros Gaitanos
Keyword(s):  
Nuclear Reactions ◽  
Heavy Ion ◽  
Nuclear Fragmentation ◽  
Equilibrium Dynamics ◽  
Ion Collisions ◽  
Light Ions ◽  
Classical Transport ◽  
Nuclear Targets ◽  
Fragmentation Processes

In this article we review the important role of non-equilibrium dynamics in reactions induced by ions and hadron beams to understand the fragmentation processes inside hadronic media. We discuss the single-particle dynamics in specific sources such as spectators in heavy-ion collisions and residual nuclear targets in hadron-induced reactions. Particular attention is given to the dynamics of hyperons. We further discuss the question regarding the onset of local instabilities, which are relevant for the appearance of fragmentation phenomena in nuclear reactions. We apply the theoretical formalism, that is, semi-classical transport embedded with statistical methods of nuclear fragmentation, to reactions induced by light ions and hadron beams. We discuss the results of nuclear fragmentation and, in particular, examine the formation of hypernuclei. Such studies are important for obtaining a deeper understanding of the equation of state in fragmenting matter and are relevant for forthcoming experiments, such as PANDA at FAIR and J-PARC in Japan.

Exploring Baryon Rich Matter with Heavy-Ion Collisions

2019 ◽  
Vol 64 (7) ◽  
pp. 583 ◽  
Author(s):  
S. Harabasz
Keyword(s):  
Center Of Mass ◽  
Heavy Ion ◽  
State Density ◽  
Heavy Nuclei ◽  
First Order ◽  
Center Of Mass Energy ◽  
Ion Collisions ◽  
Deconfinement Phase Transition ◽  
Ground State Density

Collisions of heavy nuclei at (ultra-)relativistic energies provide a fascinating opportunity to re-create various forms of matter in the laboratory. For a short extent of time (10-22 s), matter under extreme conditions of temperature and density can exist. In dedicated experiments, one explores the microscopic structure of strongly interacting matter and its phase diagram. In heavy-ion reactions at SIS18 collision energies, matter is substantially compressed (2–3 times ground-state density), while moderate temperatures are reached (T < 70 MeV). The conditions closely resemble those that prevail, e.g., in neutron star mergers. Matter under such conditions is currently being studied at the High Acceptance DiElecton Spectrometer (HADES). Important topics of the research program are the mechanisms of strangeness production, the emissivity of matter, and the role of baryonic resonances herein. In this contribution, we will focus on the important experimental results obtained by HADES in Au+Au collisions at 2.4 GeV center-of-mass energy. We will also present perspectives for future experiments with HADES and CBM at SIS100, where higher beam energies and intensities will allow for the studies of the first-order deconfinement phase transition and its critical endpoint.

scholarly journals Role of Different Model Ingredients in the Exotic Cluster-Decay of 56Ni*

2012 ◽  
Vol 57 (8) ◽  
pp. 796
Author(s):  
N.K. Dhiman
Keyword(s):  
Density Distribution ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Cluster Decay ◽  
Nuclear Radius ◽  
Technical Parameters ◽  
Ion Collisions

We consider the cluster decay of 56Ni* formed in heavy-ion collisions, by using different parameters proposed by different authors for the Fermi density distribution and the nuclear radius. Our study reveals that different technical parameters do not alter significantly the structure of fractional yields. The cluster decay half-lives of different clusters lie within ±10% for different Fermi density parameters and nuclear radii and, therefore, justify the current set of parameters used in the literature for the calculation of cluster decays.

THE ROLE OF SPIN-ORBIT AND TENSOR FORCE IN HEAVY-ION COLLISIONS

2016 ◽  
Author(s):  
Lu Guo ◽  
Gao-Feng Dai ◽  
En-Guang Zhao ◽  
Shan-Gui Zhou
Keyword(s):  
Heavy Ion Collisions ◽  
Tensor Force ◽  
Heavy Ion ◽  
Spin Orbit ◽  
Ion Collisions

ROLE OF BARYONIC RESONANCES IN VIRTUAL PHOTON EMISSION IN ELEMENTARY AND HEAVY-ION COLLISIONS

2014 ◽  
Vol 26 ◽  
pp. 1460052 ◽  
Author(s):  
◽  
TETYANA GALATYUK
Keyword(s):  
Invariant Mass Distribution ◽  
Photon Emission ◽  
Heavy Ion ◽  
Medium Effect ◽  
Reference Spectrum ◽  
Electron Pairs ◽  
Ion Collisions ◽  
Energy Domain ◽  
First Time

The HADES experiment aims to explore strongly interacting baryon dominated matter at moderate temperatures using rare and penetrating probes. Special emphasis is put on the region of moderate beam energies where comparatively long-lived states of compressed matter are created. In the energy domain of 1–2 GeV per nucleon, HADES has measured hadrons and di-electron signals in C + C , Ar + KCl , p+p, d+p and p+ Nb collisions. For the first time the electron pairs were reconstructed from quasi-free n+p sub-reactions by detecting the proton spectator from the deuteron breakup. For the first time di-electrons radiated from cold nuclear matter in a kinematic regime, where strong medium effects are expected, have been detected. An experimentally constrained N + N reference spectrum was established. A direct comparison of the N + N reference spectrum with the e+e- invariant mass distribution measured in the heavier system Ar + KCl at 1.76 GeV/u shows an excess yield above the reference. The observation may be interpreted as the onset of an actual medium effect. We argue, that couplings between the ρ meson and the baryonic resonances are of fundamental importance in understanding dilepton spectra at SIS energies.

scholarly journals The role of the Δ (1920) resonance for kaon production in heavy ion collisions

1994 ◽  
Vol 337 (3-4) ◽  
pp. 245-253 ◽  
Author(s):  
K. Tsushima ◽  
S.W. Huang ◽  
Amand Faessler
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Kaon Production ◽  
Ion Collisions

scholarly journals LOW SHEAR VISCOSITY DUE TO ANDERSON LOCALIZATION

2007 ◽  
Vol 16 (07n08) ◽  
pp. 2256-2262
Author(s):  
IOANNIS GIANNAKIS ◽  
DEFU HOU ◽  
JIA-RONG LI ◽  
HAI-CANG REN
Keyword(s):  
Shear Viscosity ◽  
Anderson Localization ◽  
Bound States ◽  
Random Medium ◽  
Heavy Ion ◽  
Kubo Formula ◽  
Ion Collisions ◽  
Localization Effect ◽  
Low Shear

We study the Anderson Localization effect on the shear viscosity in a system with random medium by Kubo formula. We show that this effect can reduce the shear viscosity nonperturbatively. Then we discuss its possible implementation in heavy-ion collisions, where the created heavy bound states or other collective modes may play the role of the random scatterer underlying Anderson Localization effect.

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