scholarly journals Study of baryonic resonances and ρ meson production in the reaction pp → ppπ+π- at 3.5 GeV with HADES

2020 ◽  
Vol 241 ◽  
pp. 01003
Author(s):  
Amel Belounnas
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Meson Production ◽  
Heavy Ion ◽  
Nucleon Nucleon ◽  
Charged Hadron ◽  
Total Production ◽  
Resonance Model ◽  
Ion Collisions ◽  
Hades Collaboration

The High Acceptance Di-Electron Spectrometer (HADES) installed at GSI in Darmstadt and de signed to investigate dielectron production in heavy-ion collisions in the range of kinetic beam energies 1-3 A GeV is also an excellent detector for charged hadron detection. We discuss the analysis of the pp → ppπ+π- channel at an incident energy of 3.5 GeV, using results from pp→ppπ0, pp→pnπ+ and pp → pKΛ measured at the same energy by HADES. A consistent description of the differential cross sections as a function of the invariant mass and the production angles is achieved by a simple resonance model taking into account the single and the double excitation of baryonic resonances with masses up to 1.9 GeV. The contributions can be quantified and confronted to the inputs of transport models or to the predictions of dedicated models for nucleon-nucleon reactions. In addition, using specific kinematical cuts, the total production cross section and the angular dis tribution of the ρ meson have been also extracted. As both baryon resonances and the ρ meson are important sources of di-electrons, these results will provide valuable constraints for the interpretation of the dielectron spectra measured by the HADES collaboration.

scholarly journals Isospin Physics in Heavy-Ion Collisions at Intermediate Energies

1998 ◽  
Vol 07 (02) ◽  
pp. 147-229 ◽  
Author(s):  
Bao-An Li ◽  
Che Ming Ko ◽  
Wolfgang Bauer
Keyword(s):  
Equation Of State ◽  
Nuclear Matter ◽  
Cross Sections ◽  
Heavy Ion Collisions ◽  
Transport Model ◽  
Transient State ◽  
Heavy Ion ◽  
Nucleon Nucleon ◽  
Asymmetric Nuclear Matter ◽  
Ion Collisions

In nuclear collisions induced by stable or radioactive neutron-rich nuclei a transient state of nuclear matter with an appreciable isospin asymmetry as well as thermal and compressional excitation can be created. This offers the possibility to study the properties of nuclear matter in the region between symmetric nuclear matter and pure neutron matter. In this review, we discuss recent theoretical studies of the equation of state of isospin-asymmetric nuclear matter and its relations to the properties of neutron stars and radioactive nuclei. Chemical and mechanical instabilities as well as the liquid-gas phase transition in asymmetric nuclear matter are investigated. The in-medium nucleon-nucleon cross sections at different isospin states are reviewed as they affect significantly the dynamics of heavy ion collisions induced by radioactive beams. We then discuss an isospin-dependent transport model, which includes different mean-field potentials and cross sections for the proton and neutron, and its application to these reactions. Furthermore, we review the comparisons between theoretical predictions and available experimental data. In particular, we discuss the study of nuclear stopping in terms of isospin equilibration, the dependence of nuclear collective flow and balance energy on the isospin-dependent nuclear equation of state and cross sections, the isospin dependence of total nuclear reaction cross sections, and the role of isospin in preequilibrium nucleon emissions and subthreshold pion production.

MEAN-FIELD DESCRIPTION OF HEAVY-ION COLLISIONS

2004 ◽  
Vol 13 (01) ◽  
pp. 309-313 ◽  
Author(s):  
A. DOBROWOLSKI ◽  
K. POMORSKI ◽  
J. BARTEL
Keyword(s):  
Cross Sections ◽  
Sampling Method ◽  
Mean Field ◽  
Surface Friction ◽  
Monte Carlo Sampling ◽  
Heavy Ion ◽  
Nucleon Nucleon ◽  
Friction Model ◽  
Ion Collisions ◽  
Heavy Ion Fusion

Using the collective potential between colliding ions based on the effective nucleon-nucleon interactions of the Skyrme type and the semi-classical Extended Thomas-Fermi approach we describe heavy-ion fusion cross sections applying a Monte-Carlo sampling method of trajectories with the Langevin formalism using friction as described in the so-called Surface-Friction Model.

FRAGMENTATION CROSS SECTIONS IN HEAVY ION COLLISIONS

2008 ◽  
Vol 17 (09) ◽  
pp. 1927-1936
Author(s):  
BAO-AN BIAN ◽  
FENG-SHOU ZHANG ◽  
HONG-YU ZHOU
Keyword(s):  
Cross Sections ◽  
Langevin Equation ◽  
Heavy Ion Collisions ◽  
Production Cross ◽  
Heavy Ion ◽  
Ion Collisions ◽  
Target Mass

The fragment cross sections are calculated for reactions of Ne collisions with C , Al , Cu , Sn , Ta , and Pb targets at 600 Mev/nucleon using the the isospin-dependent Boltzmann-Langevin equation. We found that the production cross sections for fragments Z = 2 to 9 are qualitatively reproduced by the present calculations except for C target. In order to understand the effects of heavy ion interaction with biomolecules well, we calculate the fragmentation cross sections for reactions of 12 C + 2 H , 12 C , 14 N , 16 O at beam energies from 50 to 100 MeV/nucleon. It is found that fragment species increase approximately with increasing target mass. The obvious increment of the fragment cross sections for heavier targets at the beam energies from 50 to 80 MeV/nucleon are shown.

SIGMA MESON PRODUCTION IN HEAVY ION COLLISIONS AT INTERMEDIATE ENERGIES

2007 ◽  
Vol 22 (32) ◽  
pp. 6219-6226
Author(s):  
PORNRAD SRISAWAD ◽  
YU-MING ZHENG ◽  
CHRISTIAN FUCHS ◽  
AMAND FAESSLER ◽  
YUPENG YAN ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Meson Production ◽  
Heavy Ion ◽  
Mass Shift ◽  
Quantum Molecular Dynamics ◽  
Final State ◽  
Intermediate Energies ◽  
Simulation Results ◽  
Proton Induced Reactions

The production of the sigma (σ) meson is investigated in the quantum molecular dynamics model for the p+A reactions with the nuclei A being 12 C , 40 Ca and 208 Pb at the incident proton energies Ep = 1.50 GeV . The simulation results indicates a distinctive A dependence of the sigma production, that is, the increase of A is followed by an increase of the production cross-sections. The σ meson production in proton induced reactions is strongly medium-dependent, and the produced σ mesons decaying in a denser medium experience a stronger mass shift towards lower masses. This mass shift is an experimentally accessible observable in the final state pion pairs which did not suffer reabsorption by the surrounding nucleons. It is pointed out that the ratio of the simulation results of measurable σ mesons (in the form of two pions) cross-sections as a function of the sigma invariant-mass from various reactions opens the possibility to address experimentally the mass shift of the σ in a dense nuclear environment.

scholarly journals ON THE BALANCE ENERGY AND NUCLEAR DYNAMICS IN PERIPHERAL HEAVY-ION COLLISIONS

2010 ◽  
Vol 19 (10) ◽  
pp. 2009-2021 ◽  
Author(s):  
RAJIV CHUGH ◽  
RAJEEV K. PURI
Keyword(s):  
Cross Sections ◽  
Size Dependence ◽  
System Size ◽  
Heavy Ion ◽  
Nucleon Nucleon ◽  
Quantum Molecular Dynamics ◽  
Nuclear Dynamics ◽  
Ion Collisions ◽  
Peripheral Collisions ◽  
Balance Energy

We present here the system size dependence of balance energy for semi-central and peripheral collisions using quantum molecular dynamics model. For this study, the reactions of Ne 20+ Ne 20, Ca 40+ Ca 40, Ni 58+ Ni 58, Nb 93+ Nb 93, Xe 131+ Xe 131, and Au 197+ Au 197 are simulated at different incident energies and impact parameters. A hard equation of state along with nucleon–nucleon cross-sections between 40 and 55 mb explains the data nicely. Interestingly, balance energy follows a power law ∝Aτ for the mass dependence at all colliding geometries. The power factor τ is close to [Formula: see text] in central collisions, whereas it is [Formula: see text] for peripheral collisions suggesting stronger system size dependence at peripheral geometries. This also suggests that in the absence of momentum dependent interactions, Coulomb's interaction plays an exceedingly significant role. These results are further analyzed for nuclear dynamics at the balance point.

scholarly journals OPEN CHARM ANALYSIS ON THE FIRST PP COLLISIONS AT $\sqrt{s} = 7~{\rm TeV}$ WITH ALICE

2011 ◽  
Vol 02 ◽  
pp. 25-30 ◽  
Author(s):  
◽  
GIACOMO ORTONA
Keyword(s):  
Production Cross ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Nucleon Nucleon ◽  
Relativistic Heavy Ion Collisions ◽  
Alice Experiment ◽  
Proton Proton ◽  
Ion Collisions ◽  
Density State ◽  
Energy Domain

A Large Ion Collider Experiment (ALICE) is one of the four large experiments at the Large Hadron Collider (LHC), and the one dedicated to ultra relativistic heavy ion collisions, aiming at investigating the properties of the high-density state of QCD matter produced in such events. ALICE started to collect data in proton-proton collisions at the LHC at CERN in November 2009 (with a centre of mass energy [Formula: see text]). Since March 2010 data are being recorded at an energy of [Formula: see text] while from November 7 to December 6 LHC provided Pb-Pb collisions at an energy of [Formula: see text] per nucleon-nucleon pair. In Pb-Pb collisions heavy quarks are regarded as sensitive probes of the interaction dynamics between the parton and medium produced in the collisions, and the energies available at LHC will allow to study the production of heavy flavours with high statistics. Proton-proton data will be used to measure the heavy flavours production cross section to compare with perturbative QCD calculations in an unexplored energy domain and they will provide the reference for the study of Pb-Pb collisions. After a description of the ALICE experiment focused on its heavy flavour related performance, the status of the first analysis on charm production, measured by reconstructing the decays of D0, D+, D*+, and Ds into hadronic and semi-leptonic channels will be presented. An outlook of the same measurements for the upcoming Pb-Pb run will also be discussed.

SUBTHRESHOLD KAON- AND PION PRODUCTION IN HEAVY ION COLLISIONS: SIMILARITIFS AND DIFFERENCES

1988 ◽  
Vol 03 (15) ◽  
pp. 1441-1450 ◽  
Author(s):  
BERND SCHÜRMANN ◽  
WINFRIED ZWERMANN
Keyword(s):  
Cross Sections ◽  
Pion Production ◽  
Production Cross ◽  
Heavy Ion ◽  
Closed Form Expression ◽  
Small Probability ◽  
Form Expression ◽  
Kaon Production ◽  
Ion Collisions ◽  
Particle Phase Space

Particle inclusive yields from heavy ion reactions are described by a closed form expression which is not limited to a particular type of particle as long as this is produced in individual baryon-baryon encounters with a small probability. This criterion is satisfied for subthreshold pion and kaon production on which we concentrate. Even though the elementary pion and kaon production cross sections can both be described well by three-particle phase space considerations, the final inclusive production rates differ qualitatively from one another. The reasons for this are discussed.

scholarly journals Review of Charmonium and Bottomonium Quark State Production via Relativistic Heavy Ion Collisions

Universe ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. 13
Author(s):  
Leonard S. Kisslinger
Keyword(s):  
Heavy Quark ◽  
Cross Sections ◽  
Heavy Ion Collisions ◽  
Production Cross ◽  
Charm Quark ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Relativistic Heavy Ion Collisions ◽  
Ion Collisions ◽  
Meson States

This is a review of the production of heavy quark states via relativistic heavy ion collisions in RHIC. The heavy quarks here are c, charm quark, and b, bottom quark. The states are charmonium meson states Ψ ( n S ) , with n = 1,2 and upsilon meson states Υ ( m S ) , with m = 1,2,3. Quantum Chromodynamics (QCD) sum rules were used to derive the result that the Ψ ( 2 S ) and Υ ( 3 S ) are mixed hybrid states, which increase their production cross sections. We also review the Ψ ( n S ) and Υ ( m S ) production cross sections via Cu-Cu and Au-Au collisions, which are very important for this review of the production of heavy quark states in RHIC. The possible detection of the Quark Gluon Plasma (QGP) is also reviewed.

scholarly journals Rare Isotope Production in peripheral heavy-ion collisions in the energy range 15-25 MeV/nucleon

2019 ◽  
Vol 24 ◽  
pp. 207
Author(s):  
A. Papageorgiou ◽  
G. A. Souliotis ◽  
Y. K. Kwon ◽  
K. Tshoo ◽  
S. C. Jeong ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Mass Range ◽  
Heavy Ion ◽  
Rare Isotope ◽  
Ion Collisions ◽  
Rare Isotopes ◽  
R Process ◽  
Rare Isotope Production ◽  
Near Future

In this contribution we summarize recent efforts to describe the production of rare isotopes with beams of 15–25 MeV/nucleon expected from low-energy facilities. We first present calculated production cross sections of proton-rich nuclides from collisions of stable beams of mass A∼60–80. Our calculations are performed with the phenomenological deep-inelastic transfer (DIT) model and the microscopic con- strained molecular dynamics model (CoMD). De-excitation of the excited quasipro- jectiles from the dynamical stage of the reaction is performed with the statistical multifragmentation model (SMM). In addition to the efforts on proton-rich nuclides, we investigated the possibility of producing neutron-rich rare isotopes in the mass range A∼180–200, i.e. near the third r-process peak of A=195. We performed calcu- lations for a 208Pb (15MeV/nucleon) beam and find that the multinucleon transfer mechanism leads to very neutron-rich nuclides in this mass range. We believe that our continued progress on the study of multinucleon transfer reactions using heavy- ion beams of 15–25 MeV/nucleon, can provide new opportunities in rare isotope research in the near future, as planned at the KOBRA facility of RISP in Korea.

scholarly journals A Study of the pB → Y K Reactions for Kaon Production in Heavy Ion Collisions

1997 ◽  
Vol 50 (1) ◽  
pp. 35 ◽  
Author(s):  
K. Tsushima ◽  
S. W. Huang ◽  
Amand Faessler
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Kaon Production ◽  
Resonance Model ◽  
Total Cross Sections ◽  
Ion Collisions

Parametrizations of total cross sections sucient for all channels of the πB → Y K reactions are completed using a resonance model. As well as discussing the πN → ΛK reactions, which were not presented in our previous publications, we present the differential cross section for πN → ΛK. This report also aims at presenting supplementary discussions to our previous work.

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