Last edited by Mujind
Wednesday, May 13, 2020 | History

2 edition of A Program to study antiprotons in the cosmic rays found in the catalog.

A Program to study antiprotons in the cosmic rays

A Program to study antiprotons in the cosmic rays

Arizona collaboration.

  • 319 Want to read
  • 37 Currently reading

Published by National Aeronautics and Space Administration in [Washington, DC .
Written in English

    Subjects:
  • Antiprotons.,
  • Cosmic rays.

  • Edition Notes

    SeriesNASA-CR -- 180702., NASA contractor report -- NASA CR-180702.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15280788M

    Satellite experiments have found evidence of positrons and a few antiprotons in primary cosmic rays, amounting to less than 1% of the particles in primary cosmic rays. This antimatter cannot all have been created in the Big Bang, but is instead attributed to have been produced by .   Jan. 10, — A balloon-borne scientific instrument designed to study the origin of cosmic rays is taking its second turn high above the continent of Antarctica three and a half weeks after.

    Why it is Critical to Understand t esc • We don’t understand the right function to use for t esc in difft environments (high z galaxies, clusters)! • t esc plausibly depends on E CR, B, n, δv, ionization state, ! • We don’t understand whether ‘escape’ should be modeled as diffusion or advection or ! • Less severe for e- bec. radiative losses often rapidFile Size: 6MB. Astron. Astrophys. , L75–L78 () ASTRONOMY AND ASTROPHYSICS Letter to the Editor Diffuse galactic gamma rays, cosmic-ray nucleons and antiprotons enko1;2, 1, and 1 1 Max-Planck-Institut f¨ur Extraterrestrische Physik, Postfach , D Garching, Germany 2 Institute for Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, .

    A diagram of the Penning trap developed in the BASE project. Antiprotons are produced at CERN by bombarding atomic nuclei with protons and are then braked. They enter the trap from the left. Several of the antiparticles (purple) are stored in the supply trap. An antiproton (red) rotates in the trap so that its charge-to-mass ratio can be.   The new results are based on 12 years of data collection by the Pierre Auger Observatory, built in the plains of western Argentina in .


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A Program to study antiprotons in the cosmic rays Download PDF EPUB FB2

Get this from a library. A Program to study antiprotons in the cosmic rays: Arizona collaboration. [United States. National Aeronautics and Space Administration.;]. Occurrence in nature. Antiprotons have been detected in cosmic rays for over 25 years, first by balloon-borne experiments and more recently by satellite-based detectors.

The standard picture for their presence in cosmic rays is that they are produced in collisions of cosmic ray protons with nuclei in the interstellar medium, via the reaction, where A represents a nucleus:Discovered: Emilio Segrè & Owen Chamberlain ().

Cosmic rays are high-energy protons and atomic nuclei which move through space at nearly the speed of originate from the sun, from outside of the solar system, and from distant galaxies. Upon impact with the Earth's atmosphere, cosmic rays can produce showers of secondary particles that sometimes reach the from the Fermi Space Telescope () have been interpreted as.

work was presented in my licentiate thesis in Aprilentitled \Measurements of cosmic ray antiprotons with PAMELA". A part of this doctoral thesis concerning about the antiproton measurements, i.e. chapter 4, is selected from the licentiate thesis. After doing the data analysis on antiproton measurements, I focused on study-Author: Juan Wu.

@article{osti_, title = {Cosmic ray antiprotons at high energies}, author = {Winkler, Martin Wolfgang, E-mail: [email protected]}, abstractNote = {Cosmic ray antiprotons provide a powerful tool to probe dark matter annihilations in our galaxy.

The sensitivity of this important channel is, however, diluted by sizable uncertainties in the secondary antiproton background.

Antiprotons and gamma rays from nearby SNRs. The cosmic ray density of the protons inside the sources is expressed by a power law with spectral index α, dQ p (E p) dE p dVdt = C p E p-α. These cosmic rays interact with the ambient cold protons in the Cited by: 1.

Cosmic ray antiprotons provide an important probe for the study of the galactic Dark Matter, as they could be produced by exotic sources. On the other hand, antiprotons are anyway produced by. The HEAT-pbar instrument is designed to detect the rare antiparticle species, antiprotons (p)inthe cosmic rays.

The measurements of the p flux arriving near Earth serves as an important diagnostic tool for the under-standing of the propagation of cosmic rays through the Galaxy and for the under-standing of the diffuse gamma radiation.

The spectral intensities of antiprotons in cosmic rays provide a crucial diagnostic for understanding the origin and propagation of cosmic rays and complement the information obtained by studying the B/C ratio, the positron fluxes, and the anisotropies in the intensities at higher by: The antiproton-to-proton ratio, p bar /p, in cosmic rays has been measured in the energy range GeV.

This measurement was carried out using a balloon-borne superconducting magnetic. Propagation of secondary antiprotons and cosmic rays in the Galaxy I.V. Moskalenko a,b,*, A.W. Strong c, J.F. Ormes a, S.G. Mashnik d a NASA/Goddard Space Flight Center, CodeGreenbelt, MDUSA b Joint Center for Astrophysics, University of Maryland, Baltimore County, Baltimore, MDUSA c MPI fu¨r extraterrestrische Physik, PostfachD Garching, Germany.

A balloon-borne instrument has measured the cosmic-ray antiproton flux between and MeV and searched for antihelium between and MeV per nuclear. These particles were selected from the background of normal-matter cosmic rays by combining a selective trigger with a detailed spark chamber visualization of each recorded event.

I consider the impact of recent measurements of positron and antiproton spectra in cosmic rays on our understanding of the origins and propagation of cosmic rays, as well as on the annihilation and decay characteristics of particles of Galactic dark matter, from the perspective of current models postulating energy-dependent leakage of cosmic rays from the Galaxy and of the nested leaky-box.

Secondary Antiprotons and Propagation of Cosmic Rays in the Galaxy and Heliosphere. Igor V. Moskalenko 1,4,5, Systematic study of the uncertainties in fitting the cosmic positron data by AMS Cosmic ray nuclei, antiprotons and gamma rays in the galaxy: a new diffusion model. Key words: astroparticle physics – cosmic rays – elementary particles – ISM: general 1.

INTRODUCTION Antiprotons in cosmic rays (CR) are produced in CR interactions with interstellar gas and are, therefore, called secondary. The same interactions produce charged and neutral mesons that decay to secondary electrons and positrons and γ-rays. et al. [I]) that the confinement of cosmic rays in the Galaxy is energy dependent.

Recent observations show that the behaviour of this depen- dence is a R-~ above - 2 GV/C with 6 = to [2,3]. This would mean that the accelerated spectrum of cosmic rays has a spectral index f-3 = to P observations show that cosmic rays File Size: 6MB.

a ELSEVIER Nuclear Physics B (Proc. Suppl.) () Antiprotons from spallation of cosmic rays on ISM F. Donato' 'Laboratoire de Physique Theorique LAPTH Annecy-le-Vieux?, dance We provide the first evaluation of the secondary interstellar cosmic antiproton flux that is fully consistent with cosmic ray nuclei in the framework of a two-Zone diffusion : F.

Donato. Though success eluded experimentalists from detecting cosmic-ray antiprotons over a long period of time, the study of cosmic-ray antiprotons has now become a fascinating field of research.

In this review, we have attempted to elucidate the excitement in this area of research since the discovery of antiprotons in the by: Antiproton, subatomic particle of the same mass as a proton but having a negative electric charge and oppositely directed magnetic moment. It is the proton’s otons were first produced and identified in by Emilio Segrè, Owen Chamberlain (for which they received the Nobel Prize for Physics in ), and coworkers by bombarding a copper target with high-energy protons.

Abstract. Cosmic ray antiprotons were first detected 3 years ago by Golden et al. () and Bogomolov et al. The measured flux at ~ 10 GeV was found to be a factor of 5 to 10 higher than expected in the leaky box by: 4.

Limits on Antiprotons in Space from the Shadowing of Cosmic Rays by the Moon (Page 12) PhD Students Seminar, PSI, OctoberSummary The .Highest-Energy Cosmic Rays and Extensive Air Showers The Fly's Eye Program is unique among experiments around the world for studying cascades of 10~8 eV and higher energies, and it serves as a focus for cosmic-ray research at the highest energies in the United States.the observed cosmic ray antiprotons, although such an explanation is not unique.

In this model, most of the cosmic rays above 10^ eV are extragalactic. We describe a method of testing this hypothesis experimentally. One of the most fundamental questions in cosmology is the question of the existence of antimatter in significant quantities in the Cited by: