S. Vitillo

University of Geneva

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P. Azzarello

University of Geneva

G. Ambrosi

Istituto Nazionale di Fisica Nucleare, Sezione di Perugia

M. Duranti

Istituto Nazionale di Fisica Nucleare, Sezione di Perugia

B. Bertucci

Istituto Nazionale di Fisica Nucleare, Sezione di Perugia

X. Wu

Fudan University

V. Gallo

Fryske Akademy

M. N. Mazziotta

Istituto Nazionale di Fisica Nucleare, Sezione di Bari

D. D’Urso

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud

F. Cadoux

University of Geneva

A. Surdo

Istituto Nazionale di Fisica Nucleare, Sezione di Lecce

Cooperative Institutions

Chinese Academy of Sciences

303

University of Science and Technology of China

165

Institute of High Energy Physics

141

University of Chinese Academy of Sciences

122

Purple Mountain Observatory

114

Campbell Collaboration

Massachusetts Institute of Technology

Istituto Nazionale di Fisica Nucleare

European Organization for Nuclear Research

Institute of Modern Physics

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Proton Flux PhysRevLett.114.171103

M. Aguilar D. Aisa B. Alpat A. Alvino G. Ambrosi

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Precision Measurement of the Proton Flux in Primary Cosmic Rays from Rigidity 1 GV to 1.8 TV with the Alpha Magnetic Spectrometer on the International Space Station

Physical Review Letters (2015)

M. Aguilar D. Aisa B. Alpat A. Alvino G. Ambrosi

A precise measurement of the proton flux in primary cosmic rays with rigidity (momentum/charge) from 1 GV to 1.8 TV is presented based on 300 million events. Knowledge of the rigidity dependence of the proton flux is important in understanding the origin, acceleration, and propagation of cosmic rays. We present the detailed variation with rigidity of the flux spectral index for the first time. The spectral index progressively hardens at high rigidities.Received 6 March 2015DOI:https://doi.org/10.1103/PhysRevLett.114.171103This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical Society

Rigidity (electromagnetism)

Spectral index

International Space Station

10.1103/physrevlett.114.171103

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Citations (891)

Precision Measurement of the Boron to Carbon Flux Ratio in Cosmic Rays from 1.9 GV to 2.6 TV with the Alpha Magnetic Spectrometer on the International Space Station

Physical Review Letters (2016)

M. Aguilar L. Ali Cavasonza G. Ambrosi L. Arruda N. Attig

Knowledge of the rigidity dependence of the boron to carbon flux ratio (B/C) is important in understanding the propagation of cosmic rays. The precise measurement of the B/C ratio from 1.9 GV to 2.6 TV, based on 2.3 million boron and 8.3 million carbon nuclei collected by AMS during the first 5 years of operation, is presented. The detailed variation with rigidity of the B/C spectral index is reported for the first time. The B/C ratio does not show any significant structures in contrast to many cosmic ray models that require such structures at high rigidities. Remarkably, above 65 GV, the B/C ratio is well described by a single power law R^{Δ} with index Δ=-0.333±0.014(fit)±0.005(syst), in good agreement with the Kolmogorov theory of turbulence which predicts Δ=-1/3 asymptotically.

Rigidity (electromagnetism)

Spectral index

International Space Station

Isotopes of boron

Carbon fibers

10.1103/physrevlett.117.231102

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Citations (304)

In-flight performance of the DAMPE silicon tracker

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2018)

A. Tykhonov G. Ambrosi R. Asfandiyarov P. Azzarello P. Bernardini

Calorimeter (particle physics)

10.1016/j.nima.2018.06.036

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Citations (18)

Observation of the Identical Rigidity Dependence of He, C, and O Cosmic Rays at High Rigidities by the Alpha Magnetic Spectrometer on the International Space Station

Physical Review Letters (2017)

M. Aguilar L. Ali Cavasonza B. Alpat G. Ambrosi L. Arruda

We report the observation of new properties of primary cosmic rays He, C, and O measured in the rigidity (momentum/charge) range 2 GV to 3 TV with 90×10^{6} helium, 8.4×10^{6} carbon, and 7.0×10^{6} oxygen nuclei collected by the Alpha Magnetic Spectrometer (AMS) during the first five years of operation. Above 60 GV, these three spectra have identical rigidity dependence. They all deviate from a single power law above 200 GV and harden in an identical way.

Rigidity (electromagnetism)

International Space Station

Alpha particle

10.1103/physrevlett.119.251101

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Citations (264)

Tracker charge identification and measurement of the proton flux in cosmic rays with the DAMPE experiment

S. Vitillo

Many detectors on the ground, on balloons and in space already made a lot of efforts to improve cosmic-ray measurements, and several others are currently continuing them. The DAMPE detector is designed to pursue this task. The DAMPE Silicon Tungsten tracKer (STK) was assembled after testing individually all its components. The signals of the read-out chips of the silicon ladders were calibrated with an analysis based on ground and orbit data. A charge-loss correction of the tracker response was performed on-ground and on-orbit. We performed an analysis on 30 months of data from DAMPE, dedicated to calculate precisely the proton flux. The proton flux measured with this analysis allowed to improve the current knowledge of the energy dependence of the proton spectrum, which is the key element in understanding the origin, propagation and acceleration of cosmic rays in the Universe.

Orbit (dynamics)

International Space Station

10.13097/archive-ouverte/unige:113361

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Citations (1)

Nuclear charge measurement using AMS-02 Silicon Tracker

Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019) (2016)

S. Vitillo

The Alpha Magnetic Spectrometer (AMS-02) is an astroparticle physics detector that has been installed on the International Space Station (ISS) in May 2011.The purpose of the experiment is to study with unprecedented precision and statistics cosmic-ray particles in an energy range from 0.5 GeV to few TeV.The AMS-02 Tracker system accurately determines the trajectory and absolute charge (Z) of cosmic rays by multiple measurements of the coordinates in nine layers of double-sided silicon micro-strip detectors.Given the high dynamic range of the front-end electronics, nuclei from hydrogen up to iron and above can be identified.The charge resolution could be naturally degraded by a number of detector effects that need to be carefully accounted for.In this contribution we describe the procedure that has been used to accurately calibrate the Tracker response.Finally we will discuss the Tracker calibration stability with time.

Semiconductor detector

Nuclear electronics

International Space Station

10.22323/1.236.0429

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Citations (0)

Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons

Nature (2017)

G. Ambrosi Qi An R. Asfandiyarov P. Azzarello P. Bernardini

Annihilation

10.1038/nature24475

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