scholarly journals Modeling of the Near-Earth Low-Energy Antiproton Fluxes

2011 ◽  
Vol 2011 ◽  
pp. 1-6
Author(s):  
U. B. Jayanthi ◽  
A. A. Gusev
Keyword(s):  
Cross Sections ◽  
Particle Production ◽  
Solar Maximum ◽  
Cosmic Ray ◽  
Field Approximation ◽  
Solar Modulation ◽  
Inner Magnetosphere ◽  
Model Code ◽  
Antiproton Production ◽  
Galactic Cosmic Ray

The local interstellar antiproton spectrum is simulated taking into account antineutron decay, (He,p) interaction, secondary and tertiary antiproton production, and the solar modulation in the “force field” approximation. Inclusive invariant cross-sections were obtained through a Monte Carlo procedure using the Multistage Dynamical Model code simulating various processes of the particle production. The results of the simulations provided flux values of to and to antiprotons/( s sr GeV) at energies of 0.2 and 1 GeV, respectively, for the solar maximum and minimum epochs. Simulated flux of the trapped antiprotons in the inner magnetosphere due to galactic cosmic ray (GCR) interactions with the atmospheric constituents exceeds the galactic antiproton flux up to several orders. These simulation results considering the assumptions with the attendant limitations are in comprehensive agreement with the experimental data including the PAMELA ones.

scholarly journals Combined analysis of AMS-02 (Li,Be,B)/C, N/O, 3He, and 4He data

2020 ◽  
Vol 639 ◽  
pp. A131 ◽  
Author(s):  
N. Weinrich ◽  
Y. Génolini ◽  
M. Boudaud ◽  
L. Derome ◽  
D. Maurin
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Cosmic Ray ◽  
Nuclear Data ◽  
Quantitative Agreement ◽  
Propagation Model ◽  
Solar Modulation ◽  
Combined Analysis ◽  
Correlation Lengths ◽  
Galactic Cosmic Ray

Context. The Alpha Magnetic Spectrometer (AMS-02) measured several secondary-to-primary ratios enabling a detailed study of Galactic cosmic-ray transport. Aims. We constrain previously derived benchmark scenarios (based on AMS-02 B/C data only) using other secondary-to-primary ratios to test the universality of transport and the presence of a low-rigidity diffusion break. Methods. We use the 1D thin disc/thick halo propagation model of USINE V3.5 and a χ2 minimisation accounting for a covariance matrix of errors (AMS-02 systematics) and nuisance parameters (cross-sections and solar modulation uncertainties). Results. The combined analysis of AMS-02 Li/C, Be/C, and B/C strengthens the case for a diffusion slope of δ = 0.50 ± 0.03 with a low-rigidity break or upturn of the diffusion coefficient at GV rigidities. Our simple model can successfully reproduce all considered data (Li/C, Be/C, B/C, N/O, and 3He/4He), although several issues remain: (i) the quantitative agreement depends on the assumptions made on the poorly constrained correlation lengths of AMS-02 data systematics; (ii) combined analyses are very sensitive to production cross-sections, and we find post-fit values differing by ∼5 − 15% from their most likely values (roughly within currently estimated nuclear uncertainties); (iii) two very distinct regions of the parameter space remain viable, either with reacceleration and convection, or with purely diffusive transport. Conclusions. To take full benefit of combined analyses of AMS-02 data, better nuclear data and a better handle on energy correlations in the data systematic are required. AMS-02 data on heavier species are eagerly awaited to explore cosmic-ray propagation scenarios further.

scholarly journals Impact of cross sections uncertainties on the study of galactic cosmic-ray propagation with the DRAGON2 code

2021 ◽  
Author(s):  
Pedro De la Torre Luque ◽  
M. Nicola Mazziotta ◽  
Fabio Gargano ◽  
Francesco Loparco ◽  
Davide Serini
Keyword(s):  
Cross Sections ◽  
Cosmic Ray ◽  
Galactic Cosmic Ray

scholarly journals Solar modulation of the deep space galactic cosmic ray lineal energy spectrum measured by CRaTER, 2009–2014

Space Weather ◽  
2016 ◽  
Vol 14 (3) ◽  
pp. 247-258 ◽  
Author(s):  
C. Zeitlin ◽  
A. W. Case ◽  
N. A. Schwadron ◽  
H. E. Spence ◽  
J. E. Mazur ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Cosmic Ray ◽  
Solar Modulation ◽  
Deep Space ◽  
Lineal Energy ◽  
Galactic Cosmic Ray

scholarly journals Solar Modulation Effects in Terrestrial Production of Carbon-14

Radiocarbon ◽  
1980 ◽  
Vol 22 (2) ◽  
pp. 133-158 ◽  
Author(s):  
Giuliana Castagnoli ◽  
Devendra Lal
Keyword(s):  
Solar Activity ◽  
Cosmic Ray ◽  
Solar Modulation ◽  
Carbon 14 ◽  
Cosmic Ray Modulation ◽  
The Earth ◽  
Secular Variations ◽  
Galactic Cosmic Ray ◽  
Long Term Variations

This paper is concerned with the expected deviations in the production rate of natural 14C on the earth due to changes in solar activity. We review the published estimates of the global production rates of 14C due to galactic and solar cosmic ray particles, and present new estimates of the expected secular variations in 14C production, taking into account the latest information available on galactic cosmic ray modulation and long-term variations in solar activity.

scholarly journals Latitude survey investigation of galactic cosmic ray solar modulation during 1994-2007

2016 ◽  
Author(s):  
Waraporn Nuntiyakul ◽  
Paul Evenson ◽  
David Ruffolo ◽  
A. Saiz ◽  
J. W. Bieber ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Solar Modulation ◽  
Galactic Cosmic Ray

Solar Modulation of Galactic Cosmic-Ray Protons Based on a Modified Force-field Approach

2021 ◽  
Vol 921 (2) ◽  
pp. 109
Author(s):  
Zhenning Shen ◽  
Hao Yang ◽  
Pingbing Zuo ◽  
Gang Qin ◽  
Fengsi Wei ◽  
...  
Keyword(s):  
Force Field ◽  
Cosmic Ray ◽  
Solar Modulation ◽  
Field Approach ◽  
Galactic Cosmic Ray

LATITUDE SURVEY INVESTIGATION OF GALACTIC COSMIC RAY SOLAR MODULATION DURING 1994-2007

2014 ◽  
Vol 795 (1) ◽  
pp. 11 ◽  
Author(s):  
W. Nuntiyakul ◽  
P. Evenson ◽  
D. Ruffolo ◽  
A. Sáiz ◽  
J. W. Bieber ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Solar Modulation ◽  
Galactic Cosmic Ray
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