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CERN Document Server 找到 566 笔记录  1 - 10下一个最後  跳到记录: 检索需时 0.75 秒. 
1.
First Result from the Alpha Magnetic Spectrometer on the International Space Station: Precision Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5–350 GeV / AMS Collaboration
A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8×106 positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to ∼250  GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude. [...]
2013 - 10 p. - Published in : Phys. Rev. Lett. 110 (2013) 141102 External links: Interactions.org article; Symmetry Magazine article; Press Release
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2.
Measurement of the relative total hadronic cross section R at petra / Barber, D ; Becker, U ; Bohem, A ; Branson, J ; Bron, J ; Buikman, D ; Burger, J ; Chang, C C ; Chen, M ; Cheng, C P et al.
0000. - 13 p.
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3.
Development of electronic experiments : remarks in view of the CERN Programme 1964-1968 / Barber, D ; Becker, U ; Bohem, A ; Branson, J ; Bron, J ; Buikman, D ; Burger, J ; Chang, C C ; Chen, M ; Cheng, C P et al.
No date. - 13 p.
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4.
Associated hadronic production in μ-pair events at the ISR / Antreasyan, D ; Atwood, W ; Becker, U ; Bellettini, G ; Braccini, P L ; Branson, J G ; Burger, J D ; Carbonara, F ; Carrara, R ; Castaldi, R et al.
No date. - 27 p.
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5.
Progress report / Atwood, W B ; Becker, U ; Branson, J G ; Burger, J D ; Chen, M ; Lagerlund, T ; Hodous, M ; Matsuda, T ; Newman, H B ; Novikoff, D et al.
1977. - 4 p.
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6.
The Alpha Magnetic Spectrometer (AMS) on the International Space Station. I: Results from the test flight on the space shuttle / AMS Collaboration
The Alpha Magnetic Spectrometer (AMS) was flown on the space shuttle Discovery during flight STS-91 (June 1998) in a 51.7° orbit at altitudes between 320 and 390 km . A search for antihelium nuclei in the rigidity range 1– 140 GV was performed. [...]
2002 - 75 p. - Published in : Phys. Rep. 366 (2002) 331-405
- Published in : Phys. Rep. 380 (2003) 97-98
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7.
Properties of Neon, Magnesium, and Silicon Primary Cosmic Rays Results from the Alpha Magnetic Spectrometer / AMS Collaboration
We report the observation of new properties of primary cosmic rays, neon (Ne), magnesium (Mg), and silicon (Si), measured in the rigidity range 2.15 GV to 3.0 TV with $1.8×10^6$ Ne, $2.2×10^6$ Mg, and $1.6×10^6$ Si nuclei collected by the Alpha Magnetic Spectrometer experiment on the International Space Station. The Ne and Mg spectra have identical rigidity dependence above 3.65 GV. [...]
2020 - 8 p. - Published in : Phys. Rev. Lett. 124 (2020) 211102 Fulltext from Publisher: PDF;
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8.
Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer / AMS Collaboration
Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of $^{3}He$ and $^{4}He$ fluxes are presented. The measurements are based on 100 million $^{4}He$ nuclei in the rigidity range from 2.1 to 21 GV and 18 million He3 from 1.9 to 15 GV collected from May 2011 to November 2017. [...]
2019 - 8 p. - Published in : Phys. Rev. Lett. 123 (2019) 181102 Fulltext: PDF;
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9.
Towards Understanding the Origin of Cosmic-Ray Electrons / Aguilar, M (Madrid, CIEMAT) ; Ali Cavasonza, L (IAS, Julich ; JCHP, Julich) ; Alpat, B (INFN, Perugia ; Perugia U.) ; Ambrosi, G (INFN, Perugia ; Perugia U.) ; Arruda, L (LIP, Lisbon) ; Attig, N (IAS, Julich ; JCHP, Julich) ; Azzarello, P (Geneva U.) ; Bachlechner, A (IAS, Julich ; JCHP, Julich) ; Barao, F (LIP, Lisbon) ; Barrau, A (LPSC, Grenoble) et al. /AMS
Precision results on cosmic-ray electrons are presented in the energy range from 0.5 GeV to 1.4 TeV based on 28.1×106 electrons collected by the Alpha Magnetic Spectrometer on the International Space Station. In the entire energy range the electron and positron spectra have distinctly different magnitudes and energy dependences. [...]
2019 - 9 p. - Published in : Phys. Rev. Lett. 122 (2019) 101101 Fulltext from Publisher: PDF;
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10.
Towards Understanding the Origin of Cosmic-Ray Positrons / Aguilar, M (Madrid, CIEMAT) ; Ali Cavasonza, L (IAS, Julich ; JCHP, Julich) ; Ambrosi, G (INFN, Perugia) ; Arruda, L (LIP, Lisbon) ; Attig, N (IAS, Julich ; JCHP, Julich) ; Azzarello, P (Geneva U.) ; Bachlechner, A (IAS, Julich ; JCHP, Julich) ; Barao, F (LIP, Lisbon) ; Barrau, A (LPSC, Grenoble) ; Barrin, L (CERN) et al. /AMS
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..
2019 - 9 p. - Published in : Phys. Rev. Lett. 122 (2019) 041102 Fulltext from Publisher: PDF;
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CERN Document Server : 找到 566 笔记录   1 - 10下一个最後  跳到记录:
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8 Becker, U J
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