Download or read book Cosmic Rays Anti deuteron Flux Sensivity of the AMS 02 Detector written by Francesca Giovacchini and published by . This book was released on 2007 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Time dependent Fluctuations in Cosmic Ray Flux with the AMS 01 Detector and Construction of the AMS 02 Detector written by Mercedes Paniccia and published by . This book was released on 2008 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The soalr activity is known to influence the cosmic-ray flux on earth up to energies of 50 GeV per nucleon. The AMS-01 detector, which was flown on board the NASA Space Shuttle "Discovery" in June 1998, is sensitive to the highest energy range of solar particle events. Systematic flux fluctuations for the main cosmic-ray components (protons, helium nuclei and electrons) have been searched in the energy range accessible to the AMS-01 detector (from 100 Mev per nucleon to 200 GeV per nucleon) for the time interval for which suitable AMS-01 data are available (from June 8 to June 12, 1998). Systematic variations of cosmic-ray flux have been observed in the energy range below the geomagnetic cutoff. The comparison to the geomagnetic activity of the time has shown a correlation between systematic flux decreases and magnetic distrurbances of solar origin.
Download or read book Particle Physics at the Year of 250th Anniversary of Moscow University written by A. I. Studenikin and published by World Scientific. This book was released on 2006 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: Printbegrænsninger: Der kan printes 10 sider ad gangen og max. 40 sider pr. session.
Download or read book Direct Measurement of Galactic Cosmic Ray Fluxes with the Orbital Detector AMS 02 written by Diego Casadei and published by . This book was released on 2003 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Issues in Nuclear High Energy Plasma Particle and Condensed Matter Physics 2012 Edition written by and published by ScholarlyEditions. This book was released on 2013-01-10 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Nuclear, High Energy, Plasma, Particle, and Condensed Matter Physics: 2012 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Nuclear Physics. The editors have built Issues in Nuclear, High Energy, Plasma, Particle, and Condensed Matter Physics: 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Nuclear Physics in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Nuclear, High Energy, Plasma, Particle, and Condensed Matter Physics: 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Download or read book Review of the Theoretical and Experimental Status of Dark Matter Identification with Cosmic ray Antideuterons written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Particles Physics At The Year Of 250th Anniversary Of Moscow University Proceedings Of The 12th Lomonosov Conference On Elementary Particle Physics written by Alexander I Studenikin and published by World Scientific. This book was released on 2006-10-05 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings are devoted to a wide variety of both theoretical and experimental, areas in particle physics. The topics include neutrino and astroparticle physics, tests of the Standard Model and beyond, heavy quark physics, non-perturbative QCD, quantum gravity effects and cosmology, and the physics in the accelerators of the future.
Download or read book Measurement of the Cosmic Lepton and Electron Fluxes with the AMS Detector on Board of the International Space Station Monitoring of the Energy Measurement in the Calorimeter written by Li Tao and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Alpha Magnetic Spectrometer (AMS) is a particle detector installed on the International Space Station; it starts to record data since May 2011. The experiment aims to identify the nature of charged cosmic rays and photons and measure their fluxes in the energy range of GeV to TeV. These measurements enable us to refine the cosmic ray propagation models, to perform indirect research of dark matter and to search for primordial antimatter (anti-helium). In this context, the data of the first years have been utilized to measure the electron flux and lepton flux (electron + positron) in the energy range of 0.5 GeV to 700 GeV. Identification of electrons requires an electrons / protons separation power of the order of 104, which is acquired by combining the information from different sub-detectors of AMS, in particular the electromagnetic calorimeter (ECAL), the tracker and the transition radiation detector (TRD). In this analysis, the numbers of electrons and leptons are estimated by fitting the distribution of the ECAL estimator and are verified using the TRD estimator: 11 million leptons are selected and analyzed. The systematic uncertainties are determined by changing the selection cuts and the fit procedure. The geometric acceptance of the detector and the selection efficiency are estimated thanks to simulated data. The differences observed on the control samples from data allow to correct the simulation. The systematic uncertainty associated to this correction is estimated by varying the control samples. In total, at 100 GeV (resp. 700 GeV), the statistic uncertainty of the lepton flux is 2% (30%) and the systematic uncertainty is 3% (40%). As the flux generally follows a power law as a function of energy, it is important to control the energy calibration. We have controlled in-situ the measurement of energy in the ECAL by comparing the electrons from flight data and from test beams, using in particular the E/p variable where p is momentum measured by the tracker. A second method of absolute calibration at low energy, independent from the tracker, is developed based on the geomagnetic cutoff effect. Two models of geomagnetic cutoff prediction, the Störmer approximation and the IGRF model, have been tested and compared. These two methods allow to control the energy calibration to a precision of 2% and to verify the stability of the ECAL performance with time.
Download or read book Search for Antideuterons and Strangelets in Cosmic Rays with AMS 01 written by Reyco Henning and published by . This book was released on 2003 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: AMS (the Alpha Magnetic Spectrometer) is a high-energy particle detector in space. An engineer- ing version of AMS, AMS-01, flew on the space shuttle Discovery for ten days in June 1998 and collected 108 cosmic ray events. This thesis extends the previous results of the AMS-01 flight by performing a search for antideuterons (−D) in cosmic rays. Antideuterons in cosmic rays could be a signal for neutralino dark matter annihilation, primordial black hole evaporation and other interesting processes. No D̄ nuclei were found, and a flux limit is estimated. We also present the results of preliminary strangelet search. Some interesting effects of the Mir space station on AMS-01 when Discovery was docked with Mir are also discussed.
Download or read book Measurement of the Positron Fraction in Cosmic Rays from 0 5 350 GeV with the AMS 02 Detector on the International Space Station written by Melanie Heil and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Astroparticle Physics Theory and Phenomenology written by Günter Sigl and published by Springer. This book was released on 2016-12-05 with total page 877 pages. Available in PDF, EPUB and Kindle. Book excerpt: This books aims at giving an overview over theoretical and phenomenological aspects of particle astrophysics and particle cosmology. To be of interest for both students and researchers in neighboring fields of physics, it keeps a balance between well established foundations that will not significantly change in the future and a more in-depth treatment of selected subfields in which significant new developments have been taking place recently. These include high energy particle astrophysics, such as cosmic high energy neutrinos, the interplay between detection techniques of dark matter in the laboratory and in high energy cosmic radiation, axion-like particles, and relics of the early Universe such as primordial magnetic fields and gravitational waves. It also contains exercises and thus will be suitable for both introductory and advanced courses in astroparticle physics.
Download or read book High Charge Cosmic Rays Measurement with the AMS 02 Silicon Tracker written by Alberto Oliva (Físico) and published by . This book was released on 2007 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Space Qualification of the Transition Radiation Detector of the AMS 02 Experiment and Indirect Search for Dark Matter written by Chan-Hoon Chung and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Energy Cosmic Rays written by Todor Stanev and published by Springer Science & Business Media. This book was released on 2010-03-10 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers an accessible text and reference (a cosmic-ray manual) for graduate students entering the field and high-energy astrophysicists will find this an accessible cosmic-ray manual Easy to read for the general astronomer, the first part describes the standard model of cosmic rays based on our understanding of modern particle physics. Presents the acceleration scenario in some detail in supernovae explosions as well as in the passage of cosmic rays through the Galaxy. Compares experimental data in the atmosphere as well as underground are compared with theoretical models
Download or read book Performance of the Electromagnetic Calorimeter of AMS 02 on the International Space Station Ans Measurement of the Positronic Fraction in the 1 5 350 GeV Energy Range written by Laurent Basara and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The AMS-02 experiment is a particle detector installed on the International Space Station (ISS) since May 2011, which measures the characteristics of the cosmic rays to bring answers to the problematics risen by the astroparticle physics since a few decades, in particular the study of dark matter and the search of antimatter. The phenomenological aspects of the physics of cosmic rays are reviewed in a first part. A second one describes the in-flight performances of the different subdetectors of AMS-02, in particular the electromagnetic calorimeter. It is shown, using particles at the ionizing minimum (MIPs), accounting for the main part of cosmic rays, that the calorimeter works as expected, and we find the same performances as on ground. This study is used to follow in time the evolution of the detector performances. It also allows to develop a charge estimator for the nuclei using the calorimeter. A third and final part, deals with the determination of the positronic fraction. The main difficulty of this measurement is to identify the positrons by rejecting the protons thanks to the characteristics of the showers in the calorimeter. After having defined variables relevant for this separation, we build an estimator using a multivariate analysis and Monte-Carlo simulations of electrons for the higher energies. Above 100 GeV, we obtain a rejection factor of about 10 000 at a 90% efficiency. After having estimated the charge confusion, this estimator, finally, allows us to determine the positronic ratio for the first 18 months of data and energies ranging from 1.5 to 350 GeV.
Download or read book Search for Anisotropies in the Arrival Directions of Charged Cosmic Rays with AMS 02 written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Precision Measurement of the Boron to Carbon Ratio in Cosmic Rays with AMS 02 written by and published by . This book was released on 2015 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: A precision measurement of the Boron to Carbon ratio in cosmic rays is carried out in the range 1 GeV/n to 670 GeV/n using the first 30 months of flight data of AMS-02 located on the International Space Station. Above 20 GeV/n, it is the first accurate measurement. About 5 million clean Boron and Carbon nuclei are identified. The experimental and analysis challenges in achieving a high precision measurement are addressed. Boron is exclusively produced as a secondary particle by spallation from primary elements like Carbon in collisions with interstellar medium. The unprecedented precision and energy range of this measurement deepen the knowledge of cosmic ray propagation. Using this measurement, the diffusion coefficient in Gal-Prop model is determined to be (6.05 ± 0.05)10^28 cm2/s, and the Alfven velocity is (33.9 ± 1.0) km/s. This makes the prediction of secondary anti-proton background in dark matter search one order of magnitude more accurate.
