Spallation of 32S ions at ultra-relativistic energies in nuclear emulsion

2004 ◽  
Vol 82 (4) ◽  
pp. 263-275 ◽  
Author(s):  
M El-Nadi ◽  
A Abdelsalam ◽  
E A Shaat ◽  
N Ali Mossa ◽  
Z Abou Moussa ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Energy Dependence ◽  
Cross Sections ◽  
Nuclear Emulsion ◽  
Rest Frame ◽  
Production Cross ◽  
Combined Model ◽  
200 Gev ◽  
Nuclear Events ◽  
Good Agreement

Partial production cross sections of electromagnetic breakup of 32S projectiles at two widely differing energies were measured using an emulsion target. The electromagnetic dissociation represents about 6% and 17% of the total number of nuclear events at Elab/A = 3.7 and 200 GeV, respectively. The experimental electromagnetic cross sections σexpEMD show an energy dependence that is well reproduced by the Weizsacker–Williams approximation. The value of σexpEMD at 200A GeV (with γ >> 1) shows a good agreement with that predicted by the combined model of Pshenichnov et al. Examination of the reactions (γ, p) and (γ, He) reveals that the ratio of 1 p/1 He cross sections is close to unity at Dubna energy (3.7A GeV), while it rapidly increases to 3.0 ± 0.6 at CERN energy (200A GeV). In most of the observed dissociation modes, the total kinetic energy of the fragments in the projectile rest frame is lower than 50 MeV. Nevertheless, it is possible that the contribution of excitation modes of the different multipolarities is determining in this region. PACS No.: 25.70

scholarly journals Production and electromagnetic decay of hyperons: a feasibility study with HADES as a phase-0 experiment at FAIR

2021 ◽  
Vol 57 (4) ◽  
Author(s):  
J. Adamczewski-Musch ◽  
◽  
A. Belyaev ◽  
A. Blanco ◽  
C. Blume ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Feasibility Study ◽  
Cross Sections ◽  
Production Cross ◽  
Electromagnetic Decay ◽  
Electromagnetic Decays ◽  
Detector Acceptance ◽  
Phase 0 ◽  
Forward Detector ◽  
Expected Signal

AbstractA feasibility study has been performed in order to investigate the performance of the HADES  detector to measure the electromagnetic decays of the hyperon resonances $$\Sigma (1385)^{0}$$ Σ ( 1385 ) 0 ,  $$\Lambda (1405)$$ Λ ( 1405 )   and $$\Lambda (1520)$$ Λ ( 1520 )   as well as the production of double strange baryon systems $$\Xi ^{-}$$ Ξ -  and $$\Lambda $$ Λ $$\Lambda $$ Λ  in p + p reactions at a beam kinetic energy of $$4.5\,{\mathrm{GeV}}$$ 4.5 GeV . The existing HADES  detector will be upgraded by a new Forward Detector, which extends the detector acceptance into a range of polar angles that plays a crucial role for these investigations. The analysis of each channel is preceded by a consideration of the production cross-sections. Afterwards the expected signal count rates using a target consisting of either liquid hydrogen or polyethylene are summarized.

scholarly journals Energy Dependence of Total Cross Sections for Reactions with 4, 6he, 6, 7, 9li Nuclei

KnE Energy ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 21
Author(s):  
Yu Penionzhkevich ◽  
Yu Sobolev ◽  
V Samarin ◽  
M Naumenko
Keyword(s):  
Experimental Data ◽  
Energy Range ◽  
Numerical Solution ◽  
Energy Dependence ◽  
Cross Sections ◽  
Beam Energy ◽  
Microscopic Analysis ◽  
Time Dependent ◽  
Total Cross Sections ◽  
Good Agreement

The paper presents the results of measurement of the total cross sections for reactions 4,6He + Si and 6,7,9Li + Si in the beam energy range 5−50 A⋅MeV. The enhancements of the total cross sections for reaction 6He + Si compared with reaction 4He + Si, and 9Li + Si compared with reactions 6,7Li + Si have been observed. The performed microscopic analysis of total cross sections for reactions 6He + Si and 9Li + Si based on numerical solution of the time-dependent Schrödinger equation for external neutrons of projectile nuclei 6He and 9Li yielded good agreement with experimental data.

Energy dependence of KNO moments using the Novero–Predazzi method with a new ansatz

1984 ◽  
Vol 62 (4) ◽  
pp. 330-337 ◽  
Author(s):  
S. Krasznovszky ◽  
I. Wagner
Keyword(s):  
Energy Dependence ◽  
Cross Sections ◽  
Empirical Formula ◽  
Production Cross ◽  
Parton Model ◽  
Proton Proton ◽  
Hadronic Production ◽  
Fermi National Accelerator Laboratory ◽  
Multiplicity Distributions ◽  
Ring Accelerator

The method of Novero–Predazzi is applied to a new ansatz with three constraints. Hadronic production cross sections σn(s) satisfying Koba–Nielsen–Olesen (KNO)-like constraints are determined; σn(s) and [Formula: see text] automatically have the KNO scaling property. The multiplicity distribution Pn obtained is identical with the empirical formula used by Bozóki et al. The generalization of the method is investigated for more than three constraints. Assuming a given energy dependence of the parameter in the KNO function, we find that all calculated higher moments ck of the KNO function are in excellent agreement with the observed values of ck – s for proton–proton (pp) interactions at Serpukhov, the Fermi National Accelerator Laboratory (FNAL), and intersecting storage rings' (ISR) energies.A zero parameter empirical formula is presented, which gives good results at a 95% confidence level for pp interactions. This KNO function describes the multiplicity distributions e+e− at positron–electron tandem ring accelerator (PETRA) energies. We give a dynamical ansatz leading to this KNO function within the framework of a parton model.

SOME ANALYSIS OF HADRON–NUCLEON COLLISIONS AT HIGH ENERGY INELASTIC INTERACTIONS IN PHOTO-EMULSION

2002 ◽  
Vol 17 (26) ◽  
pp. 1693-1699
Author(s):  
S. M. ABD EL-HALIM
Keyword(s):  
Cross Sections ◽  
Nuclear Emulsion ◽  
Production Cross ◽  
High Energy ◽  
Reaction Cross ◽  
Multiparticle Production ◽  
Incident Momentum ◽  
Multiplicity Distributions ◽  
Pseudorapidity Distributions ◽  
Reaction Cross Sections

The interaction of 400 GeV/c protons and 340 GeV/c π- with nucleons in nuclear emulsion has been investigated. The interaction mean free paths (m.f.p.) and the corresponding reaction cross-sections (σ in ) have been found, the multiplicity distributions for the events with Nh = 0 (clean events) are measured and studied as well as the angular and pseudorapidity distributions. Finally the coherent multiparticle production cross-sections (σ coh ) were estimated and compared with other data, where it was found to be increasing slowly with increasing incident momentum for protons while it increases rapidly with increasing π--momentum.

Production of Energetic Atoms by Multiple Collisions

1968 ◽  
Vol 9 (2-3) ◽  
Author(s):  
G. P. Wotzak ◽  
M. D. Kostin
Keyword(s):  
Boltzmann Equation ◽  
Kinetic Energy ◽  
Energy Dependence ◽  
Cross Sections ◽  
Atomic Beam ◽  
High Energy ◽  
Asymptotic Region ◽  
The Boltzmann Equation ◽  
Multiple Collisions ◽  
Collision Density

SummaryThe production of energetic atoms in the epithermal energy region by a high-energy atomic beam is considered by using the Boltzmann equation. Solutions of the Boltzmann equation show that numerous epithermal atoms may be generated as a result of scattering collisions in which an energetic atom transfers kinetic energy to a struck atom. For a system in which all the reactive and non-reactive cross sections have the same energy dependence and in which the thermal motion of the struck atoms can be neglected, numerical results obtained from a stochastic computer program confirm the analytical results for the asymptotic region and give detailed information on the energy dependence of the collision density for the non-asymptotic region near the source. Numerical calculations of reaction yields for a gaseous system containing two atomic species are also presented.

CS2+(B2Σu+, A2Πu → X2Πg) Fluorescence from Photoionization Excitation of CS2 Vapor

1975 ◽  
Vol 53 (19) ◽  
pp. 1861-1868 ◽  
Author(s):  
L. C. Lee ◽  
D. L. Judge ◽  
M. Ogawa
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Orbit Interaction ◽  
Emission Lines ◽  
Rydberg Series ◽  
Absorption Bands ◽  
Vibrational Levels ◽  
Splitting Constant ◽  
High Production ◽  
Good Agreement

CS2+(B2Σu+, A2Πu → X2Πg) fluorescence bands produced by irradiation of CS2 vapor with emission lines from λλ462–977 Å were analyzed and their production cross sections measured. The assignments for the emission bands of the bending transitions, B2Σu+(0ν0) → X2Πg(0ν0), have been suggested. Using the tentatively assigned positions of the band heads for the A2Πu(ν00) → X2Πg(000) transitions the ionization potentials for the A2Πu(ν00) vibrational levels were obtained and found to be in good agreement with the photoelectron data. The splitting constant of the spin–orbit interaction for the A2Πu state was thereby determined to be 169 ± 20 cm−1. The CS2+(A2Πu, B2Σu+ → X2Πg) fluorescence has exceptionally high production cross sections at the absorption bands associated with the n = 3 members of the Rydberg series III and V.

Production cross-sections of superheavy elements using nearly double magic nuclei as projectile

2017 ◽  
Vol 26 (07) ◽  
pp. 1750050
Author(s):  
Ahmad Ansari ◽  
Nader Ghahramany
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Production Cross ◽  
Evaporation Residue ◽  
Fission Barrier ◽  
Superheavy Nuclei ◽  
New Approach ◽  
Barrier Heights ◽  
Compound Nucleus Formation ◽  
Good Agreement

In our new approach, evaporation residue cross-sections for new superheavy nuclei with atomic numbers [Formula: see text] are estimated by calculation of vital characteristics of superheavy nuclei synthesis such as the fission barrier height, the compound nucleus formation probability and the survival probability of the residue nuclei. Our presented estimation is in good agreement with available experimental data. In addition, this new approach allowed us to predict the evaporation residue cross-sections for superheavy nuclei with [Formula: see text] and 120 via introducing synthesis box and compare our results with other models. It is shown that the fission barrier heights of two nuclei with [Formula: see text] and 120 are comparable with their corresponding neutron separation energies. It is suggested that for the synthesis of new superheavy nuclei, it is proper to use nearly double magic nuclei such as [Formula: see text] as our projectile, so that the fission barrier heights remain high.

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