271. Mass composition of ultra-high energy cosmic rays at the Pierre Auger ObservatoryGašper Kukec Mezek, 2019, doctoral dissertation Abstract: Cosmic rays with energies above 10^18 eV, usually referred to as ultra-high energy cosmic rays (UHECR), have been a mystery from the moment they have been discovered. Although we have now more information on their extragalactic origin, their direct sources still remain hidden due to deviations caused by galactic magnetic fields. Another mystery, apart from their production sites, is their nature. Their mass composition, still uncertain at these energies, would give us a better understanding on their production, acceleration, propagation and capacity to produce extensive air showers in the Earth's atmosphere. Mass composition studies of UHECR try to determine their nature from the difference in development of their extensive air showers.
In this work, observational parameters from the hybrid detection system of the Pierre Auger Observatory are used in a multivariate analysis to obtain the mass composition of UHECR. The multivariate analysis (MVA) approach combines a number of mass composition sensitive variables and tries to improve the separation between different UHECR particle masses. Simulated distributions of different primary particles are fitted to measured observable distributions in order to determine individual elemental fractions of the composition. When including observables from the surface detector, we find a discrepancy in the estimated mass composition between a mixed simulation sample and the Pierre Auger data. Our analysis results from the Pierre Auger data are to a great degree independent on hadronic interaction models. Although they differ at higher primary masses, the different models are more consistent, when combining fractions of oxygen and iron. Compared to previously published results, the systematic uncertainty from hadronic interaction models is roughly four times smaller. Our analysis reports a predominantly heavy composition of UHECR, with more than a 50% fraction of oxygen and iron at low energies. The composition is then becoming heavier with increasing energy, with a fraction of oxygen and iron above 80% at the highest energies.
Keywords: astroparticle physics, ultra-high energy cosmic rays, extensive air showers, mass composition, Pierre Auger Observatory, machine learning, multivariate analysis
Published in RUNG: 03.04.2019; Views: 4993; Downloads: 186
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272. Potentials and Limitations of Local Fiscal Policies as Instruments for Sustainable Development in SloveniaMiha Tomšič, Henrik Gjerkeš, Marjana Šijanec-Zavrl, Irena Bačlija Brajnik, Vladimir Prebilič, 2019, published scientific conference contribution Abstract: Local communities are one of the main cornerstones of sustainable development. They play
a vital role in utilisation of national policy instruments and exhibit the largest influence on the
energy use in the building and transport sectors. Sensible energy management can also
positively enhance evolution of local sustainability features by incorporating concepts of local
energy self-supply, decentralised energy production and circular economy. Positive economic
and social impacts can be generated by adapting strategies and policies to the local environment
while considering its endogenous potentials.
By analysing the current status, identifying and quantifying potentials, and setting clear
delimitation of responsibilities and legal constraints, local authorities can be helped to shape
innovative local fiscal policies focused on intensification of use of local renewable energy
sources and fostering of more efficient use of energy both in public and private sectors. Those
revenues whose height and content can be determined by local authorities have a very different
role in the budget already in 8 analysed Slovenian municipalities. They were quantified and
used as an analytical basis for solution-oriented steps in the design of measures to adapt local
fiscal policies to the increased use of renewable resources energy.
Keywords: fiscal policy, municipality, energy use, renewables, sustainability
Published in RUNG: 27.03.2019; Views: 4000; Downloads: 0
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275. All-sky search for correlations in the arrival directions of astrophysical neutrino candidates and ultrahigh-energy cosmic raysI. Al Samarai, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution Keywords: correlations, astrophysical neutrino, ultrahigh-energy cosmic rays
Published in RUNG: 19.02.2018; Views: 3501; Downloads: 166
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276. Report of the Telescope Array - Pierre Auger Observatory Working Group on Energy SpectrumDmitri Ivanov, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Darko Veberič, Serguei Vorobiov, Marta Trini, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution Keywords: Telescope Array, Pierre Auger Observatory, Energy Spectrum
Published in RUNG: 19.02.2018; Views: 3426; Downloads: 172
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277. Probing Lorentz symmetry with the Pierre Auger ObservatoryD. Boncioli, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Darko Veberič, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution Keywords: Pierre Auger Observatory, Lorentz invariance violation, ultra-high energy cosmic rays
Published in RUNG: 16.02.2018; Views: 3237; Downloads: 150
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278. Supernova remnants in the very-high-energy sky: prospects for the Cherenkov Telescope ArrayP. Cristofari, Christopher Eckner, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution Keywords: supernova remnants, CTA, very-high-energy
Published in RUNG: 16.02.2018; Views: 3363; Downloads: 178
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279. Diffuse and targeted searches for ultra-high-energy photons using the hybrid detector of the Pierre Auger ObservatoryMarcus Niechciol, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution Keywords: ultra-high-energy photons, Pierre Auger Observatory, hybrid detector
Published in RUNG: 16.02.2018; Views: 3245; Downloads: 149
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280. The cosmic ray energy spectrum measured using the Pierre Auger ObservatoryFrancesco Fenu, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution Keywords: cosmic ray, energy spectrum, Pierre Auger Observatory
Published in RUNG: 16.02.2018; Views: 2999; Downloads: 145
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