Dr
Emiliano Mocchiutti
(INFN, Sezione di Trieste, Italy),
Vladimir Mikhailov
(NRNU MEPHI)
31/07/2015, 11:00
CR-EX
Oral contribution
Precise measurements of electron and positron fluxes in energy range from 80 MeV to several GeV below the geomagnetic cutoff rigidity were carried out using the PAMELA magnetic spectrometer. The instrument was launched on June 15th 2006 onboard the Resurs-DK satellite on an orbit with the inclination 70 degrees and the altitude 350-600 km. It is continue to collect data so far. The...
Vladimir Mikhailov
(NRNU MEPHI)
31/07/2015, 11:15
CR-EX
Oral contribution
The PAMELA magnetic spectrometer is continuously gathering data about cosmic ray positrons and electrons on board the Resurs DK satellite since July 2006. Below about 10 GeV cosmic rays are strongly modified by charge-sign dependent solar modulation effects.
In this work the time variation of the positron fraction as observed by the PAMELA experiment is presented. The large data set, about...
Matteo Duranti
(Universita e INFN, Perugia (IT))
31/07/2015, 11:30
CR-EX
Oral contribution
We present a measurement of the cosmic ray (e$^{+}$+e$^{−}$) flux in the range 0.5 GeV to 1 TeV based on the analysis of 10.6 million (e$^{+}$+e$^{−}$) events collected by AMS. The statistics and the resolution of AMS provide a precision measurement of the flux. The flux is smooth and reveals new and distinct information. AMS measurements of individual e$^{+}$ and e$^{−}$ fluxes show neither...
Andrei Kounine
(Massachusetts Inst. of Technology (US))
31/07/2015, 11:45
CR-EX
Oral contribution
A precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. The measured positron fraction shows a rapid decrease from 1 to ∼8 GeV followed by a steady increase and reaching a maximum value at 275+-32 GeV. The new results show, for the first time, that above ~275 GeV the...
Gregory Tarle
(University of Michigan),
JIm Musser
(Indiana University), Mr
Joseph Gennaro
(U. Michigan), Dr
Mathew Geske
(Penn. State U.), Dr
Michael Schubnell
(U. Michigan), Prof.
Muller Dietrich
(U. Chicago), Prof.
Scott Nutter
(N. Kentucky U.), Prof.
Scott Wakely
(U. Chicago),
Stephane Coutu
(Penn State University),
nahee park
(University of Chicago)
31/07/2015, 12:00
CR-EX
Oral contribution
Electrons at energies greater that 1 TeV must originate in the local Galactic neighborhood, within a kpc or so, owing to their rapid energy loss rates during propagation. Only a few candidate acceleration sites exist within this horizon, such as the Vela, Monogem or Cygnus Loop supernova remnants, and thus a measurement of the multi-TeV cosmic-ray electron flux would be a very useful probe of...
Dr
David Staszak
(McGill University)
31/07/2015, 12:15
CR-EX
Oral contribution
Cosmic-ray electrons and positrons (CREs) at GeV-TeV energies are a unique probe of our local Galactic neighborhood. CREs lose energy rapidly via inverse Compton scattering and synchrotron processes while propagating in the Galaxy, effectively placing a maximal propagation distance for TeV electrons of order $\sim$1 kpc. Within this window, production of CREs can come from a handful of known,...
