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High energy cosmic ray composition

Grant number: 11/15490-8
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): March 01, 2012
Effective date (End): February 28, 2014
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Principal Investigator:Luiz Vitor de Souza Filho
Grantee:Raul Ribeiro Prado
Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated research grant:10/07359-6 - Study of cosmic rays of highest energies with the Pierre Auger Observatory , AP.TEM


The aim of this project is to study the cosmic ray composition using the Pierre Auger Observatory data. The determination of the cosmic ray compositon is a key issue in the development of the astrophysical interpretation of the data, nevertheless, the techniques used to extract this information are yet to be developed. Intrinsic fluctuations of the particle interactions through the development of the air shower is the main source of indetermination in the analysis methods. Not only that, but the energy of the particles are above the limit accessible by particle accelerators (LHC) and therefore the hadronic interactions properties are also a major source of errors. Given this problems, the analysis of the cosmic ray composition in the traditional analysis is limited to one significant parameter. However, several parameters measured by the Pierre Auger Observatory are sensitive to the primary particle type. Informations such as the radius of curvature, the number of muons, the shape of the longitudinal profile and many other proposal are yet to the used in order to reconstruct the primary particle type. In this project, we are going to use multivariete analysis techniques in order to combine these relevante parameters and reconstruct the primary particle type. Our aim is to minimize the imprecision due to shower fluctuations and hadronic interaction models in the determination of the primary particle type by using several parameters at the same time. Besides that, unfolding techniques are also going to be used in order to reconstruct the traditional elongation rate measurement. (AU)

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Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
PRADO, Raul Ribeiro. High energy cosmic rays composition study by the analysis of the Pierre Auger Observatory measured data. 2014. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT) São Carlos.

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