R. Colalillo - Academia.edu (original) (raw)
Papers by R. Colalillo
![Research paper thumbnail of Erratum: Muons in air showers at the Pierre Auger Observatory: Measurement of atmospheric production depth [Phys. Rev. D 90 , 012012 (2014)]](https://attachments.academia-assets.com/42732556/thumbnails/1.jpg)
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The European Physical Journal Conferences
The muon longitudinal profile along the shower axis depends on the nature of the primary particle... more The muon longitudinal profile along the shower axis depends on the nature of the primary particle and primary hadronic interaction with air nuclei. The measurement of muonic component inside showers generated by Very High Energy Cosmic Rays provides a very powerful tool for sensing high energy interactions between cosmic ray particles and air molecules. Fundamental parameters such as the interaction cross section, inelasticity, hadron production and multiplicity can be measured by comparing the development of shower electromagnetic component with that of muonic component. Since 1992 a method has been developed to combine the muon arrival direction in a ground based array for cosmic ray detection with their arrival delay with respect to the shower core. This combination permits to select high energy muons weakly scattered in the atmosphere and to reconstruct their height of production with good accuracy. In this paper we discuss the possibility to realize a "dual" apparatus...
The European Physical Journal C, 2015
The Astrophysical Journal, 2015
The Astrophysical Journal, 2015
ABSTRACT
EPJ Web of Conferences, 2013
ABSTRACT The muon longitudinal profile along the shower axis depends on the nature of the primary... more ABSTRACT The muon longitudinal profile along the shower axis depends on the nature of the primary particle and primary hadronic interaction with air nuclei. The measurement of muonic component inside showers generated by Very High Energy Cosmic Rays provides a very powerful tool for sensing high energy interactions between cosmic ray particles and air molecules. Fundamental parameters such as the interaction cross section, inelasticity, hadron production and multiplicity can be measured by comparing the development of shower electromagnetic component with that of muonic component. Since 1992 a method has been developed to combine the muon arrival direction in a ground based array for cosmic ray detection with their arrival delay with respect to the shower core. This combination permits to select high energy muons weakly scattered in the atmosphere and to reconstruct their height of production with good accuracy. In this paper we discuss the possibility to realize a "dual" apparatus able to detect both electromagnetic and muonic component at primary energies greater than 1017eV.
Journal of Instrumentation, 2013
ABSTRACT The Pierre Auger Observatory in Malarg¨ue, Argentina, is designed to study the propertie... more ABSTRACT The Pierre Auger Observatory in Malarg¨ue, Argentina, is designed to study the properties of ultra-high energy cosmic rays with energies above 1018 eV. It is a hybrid facility that employs a Fluorescence Detector to perform nearly calorimetric measurements of Extensive Air Shower energies. To obtain reliable calorimetric information from the FD, the atmospheric conditions at the observatory need to be continuously monitored during data acquisition. In particular, light attenuation due to aerosols is an important atmospheric correction. The aerosol concentration is highly variable, so that the aerosol attenuation needs to be evaluated hourly. We use light from the Central Laser Facility, located near the center of the observatory site, having an optical signature comparable to that of the highest energy showers detected by the FD. This paper presents two procedures developed to retrieve the aerosol attenuation of fluorescence light from CLF laser shots. Cross checks between the two methods demonstrate that results from both analyses are compatible, and that the uncertainties are well understood. The measurements of the aerosol attenuation provided by the two procedures are currently used at the Pierre Auger Observatory to reconstruct air shower data.
Journal of Cosmology and Astroparticle Physics, 2014
The Astrophysical Journal, 2014
Physical Review D, 2014
ABSTRACT Using the data taken at the Pierre Auger Observatory between December 2004 and December ... more ABSTRACT Using the data taken at the Pierre Auger Observatory between December 2004 and December 2012, we have examined the implications of the distributions of depths of atmospheric shower maximum (${X}_{\mathrm{max}}$), using a hybrid technique, for composition and hadronic interaction models. We do this by fitting the distributions with predictions from a variety of hadronic interaction models for variations in the composition of the primary cosmic rays and examining the quality of the fit. Regardless of what interaction model is assumed, we find that our data are not well described by a mix of protons and iron nuclei over most of the energy range. Acceptable fits can be obtained when intermediate masses are included, and when this is done consistent results for the proton and iron-nuclei contributions can be found using the available models. We observe a strong energy dependence of the resulting proton fractions, and find no support from any of the models for a significant contribution from iron nuclei. However, we also observe a significant disagreement between the models with respect to the relative contributions of the intermediate components.
Physical Review D, 2014
ABSTRACT
The Astrophysical Journal, 2014
ABSTRACT
The Astrophysical Journal, 2014
ABSTRACT
Atmospheric Research, 2014
Radiation Physics and Chemistry, 1998
ABSTRACT
Physical Review D, 2014
ABSTRACT See paper for full list of authors - Accepted for publication in Phys. Rev. D; 50 pages,... more ABSTRACT See paper for full list of authors - Accepted for publication in Phys. Rev. D; 50 pages, 15 figures
Journal of Cosmology and Astroparticle Physics, 2013
ABSTRACT
The European Physical Journal Conferences
The muon longitudinal profile along the shower axis depends on the nature of the primary particle... more The muon longitudinal profile along the shower axis depends on the nature of the primary particle and primary hadronic interaction with air nuclei. The measurement of muonic component inside showers generated by Very High Energy Cosmic Rays provides a very powerful tool for sensing high energy interactions between cosmic ray particles and air molecules. Fundamental parameters such as the interaction cross section, inelasticity, hadron production and multiplicity can be measured by comparing the development of shower electromagnetic component with that of muonic component. Since 1992 a method has been developed to combine the muon arrival direction in a ground based array for cosmic ray detection with their arrival delay with respect to the shower core. This combination permits to select high energy muons weakly scattered in the atmosphere and to reconstruct their height of production with good accuracy. In this paper we discuss the possibility to realize a "dual" apparatus...
The European Physical Journal C, 2015
The Astrophysical Journal, 2015
The Astrophysical Journal, 2015
ABSTRACT
EPJ Web of Conferences, 2013
ABSTRACT The muon longitudinal profile along the shower axis depends on the nature of the primary... more ABSTRACT The muon longitudinal profile along the shower axis depends on the nature of the primary particle and primary hadronic interaction with air nuclei. The measurement of muonic component inside showers generated by Very High Energy Cosmic Rays provides a very powerful tool for sensing high energy interactions between cosmic ray particles and air molecules. Fundamental parameters such as the interaction cross section, inelasticity, hadron production and multiplicity can be measured by comparing the development of shower electromagnetic component with that of muonic component. Since 1992 a method has been developed to combine the muon arrival direction in a ground based array for cosmic ray detection with their arrival delay with respect to the shower core. This combination permits to select high energy muons weakly scattered in the atmosphere and to reconstruct their height of production with good accuracy. In this paper we discuss the possibility to realize a "dual" apparatus able to detect both electromagnetic and muonic component at primary energies greater than 1017eV.
Journal of Instrumentation, 2013
ABSTRACT The Pierre Auger Observatory in Malarg¨ue, Argentina, is designed to study the propertie... more ABSTRACT The Pierre Auger Observatory in Malarg¨ue, Argentina, is designed to study the properties of ultra-high energy cosmic rays with energies above 1018 eV. It is a hybrid facility that employs a Fluorescence Detector to perform nearly calorimetric measurements of Extensive Air Shower energies. To obtain reliable calorimetric information from the FD, the atmospheric conditions at the observatory need to be continuously monitored during data acquisition. In particular, light attenuation due to aerosols is an important atmospheric correction. The aerosol concentration is highly variable, so that the aerosol attenuation needs to be evaluated hourly. We use light from the Central Laser Facility, located near the center of the observatory site, having an optical signature comparable to that of the highest energy showers detected by the FD. This paper presents two procedures developed to retrieve the aerosol attenuation of fluorescence light from CLF laser shots. Cross checks between the two methods demonstrate that results from both analyses are compatible, and that the uncertainties are well understood. The measurements of the aerosol attenuation provided by the two procedures are currently used at the Pierre Auger Observatory to reconstruct air shower data.
Journal of Cosmology and Astroparticle Physics, 2014
The Astrophysical Journal, 2014
Physical Review D, 2014
ABSTRACT Using the data taken at the Pierre Auger Observatory between December 2004 and December ... more ABSTRACT Using the data taken at the Pierre Auger Observatory between December 2004 and December 2012, we have examined the implications of the distributions of depths of atmospheric shower maximum (${X}_{\mathrm{max}}$), using a hybrid technique, for composition and hadronic interaction models. We do this by fitting the distributions with predictions from a variety of hadronic interaction models for variations in the composition of the primary cosmic rays and examining the quality of the fit. Regardless of what interaction model is assumed, we find that our data are not well described by a mix of protons and iron nuclei over most of the energy range. Acceptable fits can be obtained when intermediate masses are included, and when this is done consistent results for the proton and iron-nuclei contributions can be found using the available models. We observe a strong energy dependence of the resulting proton fractions, and find no support from any of the models for a significant contribution from iron nuclei. However, we also observe a significant disagreement between the models with respect to the relative contributions of the intermediate components.
Physical Review D, 2014
ABSTRACT
The Astrophysical Journal, 2014
ABSTRACT
The Astrophysical Journal, 2014
ABSTRACT
Atmospheric Research, 2014
Radiation Physics and Chemistry, 1998
ABSTRACT
Physical Review D, 2014
ABSTRACT See paper for full list of authors - Accepted for publication in Phys. Rev. D; 50 pages,... more ABSTRACT See paper for full list of authors - Accepted for publication in Phys. Rev. D; 50 pages, 15 figures
Journal of Cosmology and Astroparticle Physics, 2013
ABSTRACT