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CERN Document Server 2,033 records found  1 - 10nextend  jump to record: Search took 0.16 seconds. 
1.
(100)
Latest Results from the AMS Experiment on the International Space Station / Weng, Zhili (MIT) /AMS Collaboration
The Alpha Magnetic Spectrometer is a general-purpose particle physics detector operating on the International Space Station. Precision measurements by AMS of the cosmic-ray elementary particle fluxes and nuclei fluxes reveal new unexpected phenomena. [...]
SISSA, 2021 - 10 p. - Published in : PoS ICHEP2020 (2021) 045 Fulltext: PDF;
In : 40th International Conference on High Energy Physics (ICHEP), Prague, Czech Republic, 28 Jul - 6 Aug 2020, pp.045
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2.
(91)
Observation of the Identical Rigidity Dependence of the Primary Cosmic Rays Helium, Carbon and Oxygen fluxes by the Alpha Magnetic Spectrometer on the International Space Station / Weng, Zhili (MIT) /AMS Collaboration
We report on the observation of new and unexpected properties of primary cosmic rays, He, C, and O, measured in the rigidity (momentum/charge) range 2~GV to $3$~TV with 90 million helium, 8.4 million carbon, and 7.0 million oxygen nuclei collected by the Alpha Magnetic Spectrometer on the International Space Station during the first 5 years of operation. Unexpectedly, above 60 GV, these three spectra have identical rigidity dependence. [...]
SISSA, 2018 - 4 p. - Published in : PoS ICHEP2018 (2019) 364 Fulltext: PDF;
In : XXXIX International Conference on High Energy Physics, Seoul, Korea, 4 - 11 Jul 2018, pp.364
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3.
(86)
Towards Understanding the Origin of Cosmic-Ray Positrons and Electrons / Weng, Zhili (MIT) /AMS Collaboration
Precision measurements of cosmic-ray positron flux and electron flux by the Alpha Magnetic Spectrometer on the International Space Station are presented based on 1.9 million positrons up to 1 TeV and 28.1 million electrons up to 1.4 TeV. The positron flux and electron flux have distinctly different magnitudes and energy dependences. [...]
SISSA, 2021 - 6 p. - Published in : PoS ICHEP2020 (2021) 615 Fulltext: PDF;
In : 40th International Conference on High Energy Physics (ICHEP), Prague, Czech Republic, 28 Jul - 6 Aug 2020, pp.615
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4.
(57)
Towards Understanding the Origin of Cosmic-Ray Positrons / Weng, Zhili (MIT, Cambridge, Dept. Phys.) /AMS Collaboration
Precision measurements of cosmic ray positrons by the Alpha Magnetic Spectrometer on the International Space Station are presented up to 1 TeV based on 1.9 million positrons.The positron flux exhibits a significant excess starting from $25.2 \pm 1.8$ GeV followed by a sharp drop-off above $284^{+91}_{-64}$ GeV.In the entire energy range the positron flux is well described by the sum of a diffuse termassociated with low energy secondary positrons produced in the collision of cosmic rays, and a new source term of high energy positrons with a finite energy cutoff. The finite cutoff energy of the source term, $E_s$, is established with a significance of more than $4 \sigma$, and it's value is determined to be $E_s = 810^{+310}_{-180}$ GeV.These experimental data on cosmic ray positrons show that, at high energies, they predominantly originate either from dark matter collisions or from new astrophysical sources..
2020 - 8 p. - Published in : PoS ICRC2019 (2020) 091 Fulltext: PDF;
In : 36th International Cosmic Ray Conference, Madison, WI, USA, 24 Jul - 1 Aug 2019, pp.091
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5.
(45)
Observation of the New Properties of the Secondary Cosmic Rays Lithium, Berillium and Boron with the Alpha Magnetic Spectrometer on the International Space Station / Jia, Yi (MIT) /AMS Collaboration
We report on the observation of new properties of secondary cosmic rays Li, Be, and B measured in the rigidity (momentum per unit charge) range 1.9 GV to 3.3 TV with a total of 5.4 million nuclei collected by AMS during the first five years of operation aboard the International Space Station. The Li and B fluxes have an identical rigidity dependence above 7 GV and all three fluxes have an identical rigidity dependence above 30 GV with the Li/Be flux ratio of 2.0$\pm$0.1. [...]
SISSA, 2018 - 4 p. - Published in : PoS ICHEP2018 (2019) 365 Fulltext: PDF;
In : XXXIX International Conference on High Energy Physics, Seoul, Korea, 4 - 11 Jul 2018, pp.365
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6.
(44)
Unique Properties of Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer / Yan, Qi (MIT) ; Choutkoa, Vitaly (MIT)
We present the latest results on primary cosmic rays Proton (p), Helium (He), Carbon(C), Oxygen (O), Neon (Ne), Magnesium (Mg), Silicon (Si), Sulfur (S), Iron (Fe), and Nickel (Ni) with the data collected by the Alpha Magnetic Spectrometer (AMS) during the first 10 years of operation on the International Space Station from May 19, 2011 to May 6, 2021. We found that the primary cosmic rays He-C-O and Ne-Mg-Si belong to the two different classes of cosmic rays. [...]
2022 - 6 p. - Published in : 10.22323/1.414.0101 Fulltext: PDF;
In : 41st International Conference on High Energy Physics (ICHEP 2022), Bologna, Italy, 6 - 13 Jul 2022, pp.101
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7.
(44)
The Charged Cosmic Rays Measured by AMS on the International Space Station / Xu, W (MIT) /AMS Collaboration
The Alpha Magnetic Spectrometer, AMS, is successfully operating on the International Space Station for more than 6 years and has collected over 100 billion cosmic rays. We present the new physics results from AMS on the precision measurements of elementary particles and nuclei in the cosmic rays. [...]
Singapur : WSP, 2020 - 14 p. - Published in : 10.1142/9789811207402_0009
In : The 28th International Symposium on Lepton-Photon Interactions at High Energies, Guangzhou, Guangdong Sheng, China, 7 - 12 Aug 2017, pp.128-141
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8.
(38)
Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer / Chen, Yao (SDIAT, Jinan) ; Paniccia, Mercedes (Geneva U.) /AMS Collaboration
We report the observation of new properties of primary iron (Fe) cosmic rays in the rigidity range 2.65 GV to 3.0 TV with 0.62 million iron nuclei collected by the Alpha Magnetic Spectrometer experiment on the International Space Station. Above 80.5 GV the rigidity dependence of the cosmic ray Fe flux is identical to the rigidity dependence of the primary cosmic ray He, C, and O fluxes, with the Fe/O flux ratio being constant at 0.155±0.006. [...]
SISSA, 2022 - 8 p. - Published in : PoS ICRC2021 (2022) 129 Fulltext: PDF;
In : 37th International Cosmic Ray Conference (ICRC 2021), Berlin, Germany, 15 - 22 Jul 2021, pp.129
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9.
(37)
Precision Measurements of Electron Flux and Positron Flux in Primary Cosmic Rays with the Alpha Magnetic Spectrometer on the International Space Station / Weng, Zhili (MIT) /AMS Collaboration
Precision measurements of the primary cosmic ray positrons and electrons are presented up to 1\,TeV using the data sample of 1.9 million positrons and 28.1 million electrons collected by the Alpha Magnetic Spectrometer on the International Space Station. The positron flux and electron flux exhibit distinctly different and complex energy dependence. [...]
SISSA, 2018 - 4 p. - Published in : PoS ICHEP2018 (2019) 368 Fulltext: PDF;
In : XXXIX International Conference on High Energy Physics, Seoul, Korea, 4 - 11 Jul 2018, pp.368
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10.
(36)
Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station / Nozzoli, Francesco (TIFPA-INFN, Trento) /AMS Collaboration
Precision measurements by AMS of the fluxes of cosmic ray positrons, electrons, antiprotons, protons as well as their rations reveal several unexpected and intriguing features. The presented measurements extend the energy range of the previous observations with much increased precision. [...]
2019 - 4 p. - Published in : EPJ Web Conf. 209 (2019) 01007 Fulltext: PDF;
In : 7th Roma International Conference on Astroparticle Physics (RICAP 18), Rome, Italy, 4 - 7 Sep 2018, pp.01007
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