Results 31 to 40 of about 61,814 (221)

Explaining the Hardening Structures of Helium Spectrum and Boron to Carbon Ratio through Different Propagation Models

Galaxies, 2023
Recently, a series of high-precision measurements by various experiments show that cosmic ray nuclei spectra begin to harden at ∼200 GV and the boron-to-carbon (B/C) ratio has a similar trend around the same energy.
Qing Luo, Jie Feng, Pak-Hin Thomas Tam
doaj   +1 more source

K-capture cosmic ray secondaries and reacceleration [PDF]

Advances in Space Research, 2001
We have investigated the effect of reacceleration on interstellar flux of K-capture secondaries V-49 and Cr-51. Several isotopic ratios for these two isotopes are calculated using the galactic diffusion model with and without distributed reacceleration.
F.C. Jones, A. Lukasiak, V.S. Ptuskin, W.R. Webber   +3 more
openaire   +1 more source

The mass composition of cosmic rays measured with LOFAR

EPJ Web of Conferences, 2017
High-energy cosmic rays, impinging on the atmosphere of the Earth initiate cascades of secondary particles, the extensive air showers. The electrons and positrons in the air shower emit electromagnetic radiation.
Hörandel Jörg R., Bonardi A., Buitink S., Corstanje A., Falcke H., Mitra P., Mulrey K., Nelles A., Rachen J.P., Rossetto L., Schellart P., Scholten O., ter Veen S., Thoudam S., Trinh T.N.G., Winchen T.   +15 more
doaj   +1 more source

Secondary cosmic rays in the NUCLEON space experiment [PDF]

Advances in Space Research, 2019
The NUCLEON space observatory is a direct cosmic ray spectrometer designed to study cosmic ray nuclei with $Z=1-30$ at energies $10^{12}-10^{15}$ eV. It was launched as an additional payload onboard the Russian Resource-P No. 2 satellite. In this work B/C, N/O and subFe/Fe ratios are presented.
Grebenyuk, V., Karmanov, D., Kovalev, I., Kudryashov, I., Kurganov, A., Panov, A., Podorozhny, D., Tkachenko, A., Tkachev, L., Turundaevskiy, A., Vasiliev, O., Voronin, A.   +11 more
openaire   +2 more sources

New Calculation of Secondary Antiprotons in Cosmic Rays [PDF]

Proceedings of The 34th International Cosmic Ray Conference — PoS(ICRC2015), 2016
A dramatic increase in the accuracy and statistics of space-borne cosmic ray (CR) measurements has yielded several breakthroughs over the last several years. The most puzzling is the rise in the positron fraction above 10 GeV over the predictions of the propagation models assuming pure secondary production.
Moskalenko, Igor V., Jóhannesson, Gudlaugur, Kachelriess, Michael, Orlando, E, Ostapchenko, Sergey, Porter, T.A.   +5 more
openaire   +3 more sources

A mobile complex to record several secondary cosmic rays components [PDF]

E3S Web of Conferences, 2019
The paper presents a research of the different components variations of the secondary cosmic rays (SCR). These are being monitored at the Cosmic Rays Laboratory, PGI, Apatity, using an integrated set based on the SCR basic components detectors.
Mikhalko Evgenya, Maurchev Evgeny
doaj   +1 more source

Galactic positrons and electrons from astrophysical sources and dark matter [PDF]

, 2009
A very interesting puzzle about the origin of electron and positron cosmic rays is deduced from the latests experimental results. We model the propagation of such cosmic rays in terms of a successfully tested two--zone propagation model.
Abdo A A, Aharonian F, Delahaye T, Delahaye T, Ginzburg V L, Lineros R A, Maurin D, Roberto Lineros   +7 more
core   +2 more sources

Cosmic Ray Transport in the Galaxy: a Review [PDF]

, 2017
The physics of energetic particle propagation in magnetised environments plays a crucial role in both the processes of acceleration and transport of cosmic rays.
Amato, Elena, Blasi, Pasquale
core   +2 more sources

Secondary Antiprotons in Cosmic Rays

, 2001
High energy collisions of cosmic ray (CR) nuclei with interstellar gas are believed to be the mechanism producing the majority of CR antiprotons. The distinguishing spectral shape with a maximum at 2 GeV and a sharp decrease towards lower energies makes antiprotons a unique probe of the models of particle propagation in the Galaxy and modulation in the
Moskalenko, I. V., Strong, A. W., Ormes, J. F., Potgieter, M. S., Langner, U. W.   +4 more
openaire   +2 more sources

Cosmic-ray secondary nuclei and the structure of the galaxy [PDF]

The Astrophysical Journal, 1985
The consequencies of diffusive acceleration of cosmic rays in supernova shocks propagation through an inhomogeneous interstellar medium are explored. The acceleration takes place in the hot, tenuous, intercloud gas, while nuclear collisions, leading to the production of cosmic ray secondaries, predominantly occur in those regions where the supernova ...
G. E. Morfill, P. Meyer, R. Luest
openaire   +1 more source