Description
Chair: Miguel Ángel Velasco
The cosmic-ray flux of positrons ($e^+$) is measured with high precision by the space-borne particle spectrometer AMS-02. The hypothesis that pulsar wind nebulae (PWNe) can significantly contribute to the excess of the $e^+$ cosmic-ray flux has been consolidated after the observation of a $\gamma$-ray emission at TeV energies of a few degree size around Geminga and Monogem PWNe.
In this work...
Precise knowledge of the spectra of secondary cosmic-ray isotopes provides a powerful tool to constrain cosmic-ray propagation models. In particular, $^3$He isotopes in cosmic rays are produced by interactions of primary $^4$He with the interstellar medium; similarly, lithium and beryllium are mainly produced by the fragmentation of heavier primary cosmic-ray nuclei. Among light isotopes, the...
Precise knowledge of the rigidity dependence of secondary cosmic ray fluxes and of secondary-to-primary flux ratios is essential in the understanding of cosmic ray propagation. We report the properties of light secondary cosmic-ray lithium, beryllium , boron nuclei, and heavy secondary cosmic ray fluorine nuclei in the rigidity R range 2 GV to 3 TV observed by the Alpha Magnetic Spectrometer...
The latest AMS-02 data on cosmic ray electrons show a break in the energy spectrum around 40~GeV, with a change in the slope of about 0.1. We perform a combined fit to the newest AMS-02 positron and electron flux data above 10 GeV using a model where sources include production of pairs from pulsar wind nebulae (PWNe), electrons from supernova remnants (SNRs) and both species from spallation...
Deuterons are the most abundant of secondary cosmic rays and represent a few percent of the single-charged cosmic-ray nuclei. Cosmic-ray deuterons are expected to be produced by fragmentation of primary cosmic-ray Helium with the interstellar medium. Therefore, a good knowledge of the deuteron abundance and energy dependence provides essential information to verify and constrain cosmic-ray...
Recent observations by TA and Auger have advanced our understanding of ultra-high energy cosmic rays, but their origin is still unclear. As a future approach, it will be effective to obtain the directional energy spectra and compositional distributions by observing even larger statistics, and there are active discussions on future large-scale experiments. In order to realize such a huge...
CSES-01 (China Seismo-Electromagnetic Satellite) is a multi-instrumental space mission developed by CNSA (Chinese National Space Administration) and ASI (Italian Space Agency) to investigate the near-Earth electromagnetic, plasma, and particle environment, focusing on the perturbations induced by natural sources and anthropocentric emitters. The Italian High-Energy Particle Detector (HEPD-01)...
The Gamma-ray Cherenkov Telescope prototype (pGCT) is a prototype of an Imaging Atmospheric Cherenkov Telescope, developed as Small-Sized Telescope (SST) of 4m during the preparation of the Cherenkov Telescope Array (CTA). Based on a Schwarzschild-Couder dual-mirror optical design providing an optimised Point Spread Function (PSF) on a wide field, it had its first Cherenkov light on the Meudon...
The origin of the gamma-ray halo around pulsars is associated with the reduced diffusivity of energetic particles responsible for gamma-ray emission with respect to the mean-free path they adopt in the interstellar medium. A possible explanation for this behaviour is that the energetic particles released from the pulsarwind termination shock themselves trigger the turbulence necessary to...
