Light-fragment yield ratios from heavy-ion-induced fragmentation in atmospheric collisions of cosmic-ray primary nuclei

1991 ◽  
Vol 69 (12) ◽  
pp. 1481-1486
Author(s):  
M. J. Pantazopoulou ◽  
A. F. Barghouty ◽  
R. A. Witt
Keyword(s):  
Cross Sections ◽  
Cosmic Ray ◽  
Heavy Ion ◽  
Fragmentation Model ◽  
Light Fragment ◽  
Collision System ◽  
Nuclear Fragmentation ◽  
Good Correspondence ◽  
Total Cross Sections ◽  
Fragment Yield

A statistical nuclear-fragmentation model is used to calculate the total inclusive cross sections and yield ratios of light fragments (p, d, 3H, and 3He) from 800 MeV/nucleon mass-symmetric and mass-asymmetric collision systems. Comparison with available data reveal good correspondence between the observed total cross sections and fragment-yield ratios, and the calculated ones. The model is also used to calculate the 4He/3He ratio from CNO + CNO collisions at 1 GeV/nucleon. Averaging over the mass numberof the CNO collision system, we calculate a ratio of 5.76 ± 0.52 ± 12%. A mass-independent thermal-model formula gives a ratio of only ≈ 1.5. The appreciable calculated production of 4He relative to 3He, as fragmentation products in atmospheric CNO collisions with 1 GeV/nucleon cosmic-ray primary CNO nuclei, has important implications for studies of atmospheric secondaries as background sources for space-based and balloon-borne light-fragment observations.

scholarly journals Dielectron Production in Proton–Proton Collisions at √s=7 TeV with ALICE

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 24
Author(s):  
Sebastian Scheid
Keyword(s):  
Cross Sections ◽  
Mass Range ◽  
Heavy Ion ◽  
Event Generator ◽  
Leading Order ◽  
Proton Proton ◽  
Total Cross Sections ◽  
Proton Collisions ◽  
Ion Collisions ◽  
Proton Proton Collisions

The ALICE Collaboration measured dielectron production as a function of the invariant mass ( m ee ), the pair transverse momentum ( p T , ee ) and the pair distance of closest approach ( DCA ee ) in pp collisions at s = 7 TeV. Prompt and non-prompt dielectron sources can be separated with the DCA ee , which will give the opportunity in heavy-ion collisions to identify thermal radiation from the medium in the intermediate-mass range dominated by contributions from open-charm and beauty hadron decays. The charm and beauty total cross sections are extracted from the data by fitting the spectra with two different MC generators, i.e., PYTHIA a leading order event generator and POWHEG a next-to-leading order event generator. Significant model dependences are observed, reflecting the sensitivity of this measurement to the heavy-flavour production mechanisms.

scholarly journals Analysis of pp and p̄p elastic scatterings based on theoretical bounds in high-energy physics: An update

2017 ◽  
Vol 32 (28n29) ◽  
pp. 1750175 ◽  
Author(s):  
V. A. Okorokov ◽  
S. D. Campos
Keyword(s):  
Cross Sections ◽  
High Energy Physics ◽  
Quantitative Description ◽  
Cosmic Ray ◽  
High Energy ◽  
Hadron Colliders ◽  
Total Cross Sections ◽  
Energy Frontier ◽  
Energy Physics ◽  
Axiomatic Quantum Field Theory

In a previous work a novel parametrization was proposed for the [Formula: see text] and [Formula: see text] total cross-sections. Here, results are presented for the updated analysis with taking into account the recent data from accelerator experiments as well as from cosmic ray measurements. The analytic parametrizations suggested within axiomatic quantum field theory (AQFT) provide the quantitative description of energy dependence of global scattering observables with robust values of fit parameters. Based on the fit results the estimations are derived for the total cross-section and the [Formula: see text] parameter in elastic [Formula: see text] scattering at various [Formula: see text] up to energy frontier [Formula: see text] PeV which can be useful for present and future hadron colliders as well as for cosmic ray measurements at ultra-high energies.

scholarly journals Heavy ion irradiation of astrophysical ice analogs

2009 ◽  
Vol 5 (S263) ◽  
pp. 29-32
Author(s):  
Eduardo Seperuelo Duarte ◽  
Alicja Domaracka ◽  
Philippe Boduch ◽  
Hermann Rothard ◽  
Emmanuel Balanzat ◽  
...  
Keyword(s):  
Cosmic Rays ◽  
Cross Sections ◽  
Ion Irradiation ◽  
Cosmic Ray ◽  
Heavy Ion ◽  
Galactic Cosmic Rays ◽  
Electronic Energy ◽  
Nickel Ions ◽  
Light Ions ◽  
Uv Photons

AbstractIcy grain mantles consist of small molecules containing hydrogen, carbon, oxygen and nitrogen atoms (e.g. H2O, CO, CO2, NH3). Such ices, present in different astrophysical environments (giant planets satellites, comets, dense clouds, and protoplanetary disks), are subjected to irradiation of different energetic particles: UV radiation, ion bombardment (solar and stellar wind as well as galactic cosmic rays), and secondary electrons due to cosmic ray ionization of H2. The interaction of these particles with astrophysical ice analogs has been the object of research over the last decades. However, there is a lack of information on the effects induced by the heavy ion component of cosmic rays in the electronic energy loss regime. The aim of the present work is to simulate of the astrophysical environment where ice mantles are exposed to the heavy ion cosmic ray irradiation.Sample ice films at 13K were irradiated by nickel ions with energies in the 1-10 MeV/u range and analyzed by means of FTIR spectrometry. Nickel ions were used because their energy deposition is similar to that deposited by iron ions, which are particularly abundant cosmic rays amongst the heaviest ones.In this work the effects caused by nickel ions on condensed gases are studied (destruction and production of molecules as well as associated cross sections, sputtering yields) and compared with respective values for light ions and UV photons.

Role of the nuclear surface in the formation of total cross sections for heavy-ion reactions

2001 ◽  
Vol 64 (7) ◽  
pp. 1273-1281 ◽  
Author(s):  
V. K. Lukyanov ◽  
B. Słowinski ◽  
E. V. Zemlyanaya
Keyword(s):  
Cross Sections ◽  
Heavy Ion ◽  
Nuclear Surface ◽  
Total Cross Sections ◽  
Heavy Ion Reactions

A simplified optical model description of heavy ion fragmentation

1985 ◽  
Vol 63 (2) ◽  
pp. 135-138 ◽  
Author(s):  
L. W. Townsend ◽  
J. W. Wilson ◽  
J. W. Norbury
Keyword(s):  
Cross Sections ◽  
Optical Model ◽  
Production Cross ◽  
Heavy Ion ◽  
Model Potential ◽  
Model Description ◽  
Fragmentation Model ◽  
Mechanical Formalism ◽  
Optical Model Potential ◽  
Quantum Mechanical Formalism

The fragmentation of 213 MeV/nucleon 40Ar ions by 12C targets is described within the context of a simple abrasion–ablation fragmentation model. The abrasion part of the theory utilizes a quantum-mechanical formalism based upon an optical model potential approximation to the exact nucleus-nucleus multiple-scattering series. The ablation stage of the fragmentation is treated as a compound nucleus evaporation. The decay probabilities for the various particle emission channels are computed using the EVAP-4 Monte Carlo computer program. Predictions for production cross sections for isotopes of sulfur, phosphorus, silicon, and aluminum are made and compared with experimental data. The model is also used to compare predicted and experimental element production cross sections for 1.88 GeV/nucleon 56Fe colliding with 12C and 208Pb targets.

scholarly journals Evaluation Method of Heavy-Ion-Induced Single-Event Upset in 3D-Stacked SRAMs

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1230
Author(s):  
Peixiong Zhao ◽  
Tianqi Liu ◽  
Chang Cai ◽  
Ze He ◽  
Dongqing Li ◽  
...  
Keyword(s):  
Cross Sections ◽  
Evaluation Method ◽  
Ion Irradiation ◽  
Three Dimensional ◽  
Random Access ◽  
Cosmic Ray ◽  
Heavy Ion ◽  
Ultrahigh Energy ◽  
Single Event ◽  
Heavy Ion Irradiation

The interaction of radiation with three-dimensional (3D) electronic devices can be determined through the detection of single-event effects (SEU). In this study, we propose a method for the evaluation of SEUs in 3D static random-access memories (SRAMs) induced by heavy-ion irradiation. The cross-sections (CSs) of different tiers, as a function of the linear energy transfer (LET) under high, medium, and low energy heavy-ion irradiation, were obtained through Monte Carlo simulations. The simulation results revealed that the maximum value of the CS was obtained under the medium-energy heavy-ion penetration, and the effect of penetration range of heavy ions was observed in different tiers of 3D-stacked devices. The underlying physical mechanisms of charge collection under different heavy-ion energies were discussed. Thereafter, we proposed an equation of the critical heavy-ion range that can be used to obtain the worst CS curve was proposed. Considering both the LET spectra and flux of galactic cosmic ray (GCR) and the variation in the heavy-ion Bragg peak values with the atomic number, we proposed a heavy-ion irradiation test guidance for 3D-stacked devices. In addition, the effectiveness of this method was verified through simulations of the three-tier vertically stacked SRAM and the ultrahigh-energy heavy-ion irradiation experiment of the two-tier vertically stacked SRAM. this study provides a theoretical framework for the detection of SEUs induced by heavy-ion irradiation in 3D-integrated devices.

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