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1.
Magnetic anisotropy of strontium ferrite nanoparticles
F. Albertini, C. Sangregorio, Blaž Belec, A. Quesada, T. Schliesch, M. Suara-Muzquiz, Petra Jenuš, M. Albino, M. Petrecca, M. Cabassi, D. Mishra, Cesar de Julian Fernandez, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Najdeno v: ključnih besedah
Ključne besede: hexaferrite, nanoparticles, magnetic anisotropy, SPD
Objavljeno: 04.06.2019; Ogledov: 551; Prenosov: 0
.pdf Polno besedilo (36,89 MB)

2.
Search for Anisotropy in the Ultra High Energy Cosmic Ray Spectrum using the Telescope Array Surface Detector
J.P. Lundquist, R.U. Abbasi, 2017, drugi članki ali sestavki

Opis: The Telescope Array (TA) experiment is located in the western desert of Utah, USA, and observes ultra high energy cosmic rays (UHECRs) in the Northern hemisphere. At the highest energies, E>10~EeV, the shape of cosmic ray energy spectrum may carry an imprint of the source density distribution along the line of sight different in different directions of the sky. In this study, we search for such directional variations in the shape of the energy spectrum using events observed with the Telescope Array's surface detector. We divide the TA field of view into two nearly equal-exposure regions: the "on-source" region which we define as ±30∘ of the supergalactic plane containing mostly nearby structures, and the complementary "off-source" region where the sources are further away on average. We compare the UHECR spectra in these regions by fitting them to the broken power law and comparing the resulting parameters. We find that the off-source spectrum has an earlier break at highest energies. The chance probability to obtain such or larger difference in statistically equivalent distributions is estimated as 6.2±1.1×10−4 (3.2σ) by a Monte-Carlo simulation. The observed difference in spectra is in a reasonable quantitative agreement with a simplified model that assumes that the UHECR sources trace the galaxy distribution from the 2MRS catalogue, primary particles are protons and the magnetic deflections can be neglected.
Najdeno v: ključnih besedah
Povzetek najdenega: ...catalogue, primary particles are protons and the magnetic deflections can be neglected....
Ključne besede: cosmic radiation: UHE, detector: surface, cosmic radiation: spectrum, cosmic radiation: energy spectrum, deflection: magnetic, numerical calculations: Monte Carlo, anisotropy
Objavljeno: 27.04.2020; Ogledov: 78; Prenosov: 4
.pdf Polno besedilo (169,05 KB)

3.
Supergalactic Structure of Multiplets with the Telescope Array Surface Detector
P. Sokolsky, J.P. Lundquist, 2019, objavljeni znanstveni prispevek na konferenci

Opis: Evidence of supergalactic structure of multiplets has been found for ultra-high energy cosmic rays (UHECR) with energies above 10^19 eV using 7 years of data from the Telescope Array (TA) surface detector. The tested hypothesis is that UHECR sources, and intervening magnetic fields, may be correlated with the supergalactic plane, as it is a fit to the average matter density within the GZK horizon. This structure is measured by the average behavior of the strength of intermediate-scale correlations between event energy and position (multiplets). These multiplets are measured in wedge-like shapes on the spherical surface of the fieldof-view to account for uniform and random magnetic fields. The evident structure found is consistent with toy-model simulations of a supergalactic magnetic sheet and the previously published Hot/Coldspot results of TA. The post-trial probability of this feature appearing by chance, on an isotropic sky, is found by Monte Carlo simulation to be ~4.5σ.
Najdeno v: ključnih besedah
Povzetek najdenega: ...hypothesis is that UHECR sources, and intervening magnetic fields, may be correlated with the supergalactic... ...UHECR, cosmic rays, energy spectrum, anisotropy, large-scale structure, magnetic deflection...
Ključne besede: UHECR, cosmic rays, energy spectrum, anisotropy, large-scale structure, magnetic deflection
Objavljeno: 28.04.2020; Ogledov: 89; Prenosov: 4
.pdf Polno besedilo (1,38 MB)

4.
Evidence of Intermediate-Scale Energy Spectrum Anisotropy in the Northern Hemisphere from Telescope Array
J.P. Lundquist, 2018, objavljeni znanstveni prispevek na konferenci

Opis: Evidence of an energy dependent intermediate-scale anisotropy has been found in the arrival directions of ultra-high energy cosmic rays in the northern hemisphere, using 7 years of TA surface detector data. The previously reported ``hot spot" excess E ≥ 10^19.75 EeV is found to correspond to a deficit, or ``cold spot," of events for 10^19.2≤ E < 10^19.75 EeV. This feature suggests energy dependent magnetic deflection of cosmic-rays. The global post-trial significance of the energy spectrum deviation is found to be 3.74σ.
Najdeno v: ključnih besedah
Povzetek najdenega: ...10^19.75 EeV. This feature suggests energy dependent magnetic deflection of cosmic-rays. The global post-trial significance...
Ključne besede: UHECR, cosmic rays, energy spectrum, anisotropy, magnetic deflection
Objavljeno: 28.04.2020; Ogledov: 87; Prenosov: 4
.pdf Polno besedilo (4,87 MB)

5.
Telescope Array Hot/Coldspot Study – Intermediate Scale Anisotropy
J.P. Lundquist, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: Indications of energy dependent intermediate scale anisotropy has been found in the arrival directions of ultra high energy cosmic rays with energies above 20 EeV in the northern hemisphere, using 7 years of TA surface detector data. The previously reported “hotspot‘” excess for E>57 EeV is found to correspond to a deficit, or “coldspot ”, of events for energies 2057 EeV has a Li Ma statistical significance of 4.62σ, and the deficit for energies 20Najdeno v: ključnih besedah
Povzetek najdenega: ...The hot/ coldspot feature suggests energy dependent magnetic deflection of the isotropic background and cosmic rays...
Ključne besede: cosmic rays, energy spectrum, anisotropy, magnetic deflection
Objavljeno: 28.04.2020; Ogledov: 90; Prenosov: 0
.pdf Polno besedilo (2,25 MB)

6.
Energy-position correlation anisotropy of ultra-high energy cosmic rays with Telescope Array Data
J.P. Lundquist, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: Indication of an energy dependent intermediate-scale anisotropy has been found in the arrival directions of ultra-high energy cosmic rays with energies above 20 EeV in the northern hemisphere, using 7 years of TA surface detector data. The previously reported “hotspot“ excess for E>57 EeV is found to correspond to a deficit, or “coldspot“, of events for energies 2057 EeV has a Li-Ma statistical significance of 4.62σ, and the deficit for energies 20Najdeno v: ključnih besedah
Povzetek najdenega: ...supergalactic plane. The hot/coldspot feature suggests energy dependent magnetic deflection of the isotropic background and cosmic-rays...
Ključne besede: UHECR, energy spectrum, anisotropy, magnetic deflection
Objavljeno: 29.04.2020; Ogledov: 74; Prenosov: 0
.pdf Polno besedilo (1,84 MB)

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