for the PAMELA collaboration

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Presentation transcript:

for the PAMELA collaboration Abundance of light nuclei in cosmic rays measured by the space experiment PAMELA Roberta Sparvoli for the PAMELA collaboration University of Rome “Tor Vergata”, Italy

What is PAMELA ? Dimensions: 130 x 70 x 70 cm3 Total weight : 470 kg All details: P. Picozza et al., Astroparticle Physics, 27, 296, 2007

PAMELA Science PAMELA is: Searching for antimatter in CR (antiprotons, positrons, anti-nuclei) Searching for dark matter (by indirect signature in antiproton/positron signals) Studing cosmic-ray propagation (by measuring light-nuclei fluxes) Studing magnetosphere physics Studing solar physics and solar modulation This proposal !

PAMELA in Space On June 15th 2006 at 08:00 UTC the RESURS DK-1 satellite housing the PAMELA apparatus was successfully launched in space for the Russian cosmodrome of Baikonur. PAMELA was switched on for the first time on June 21st 2006. In the following days PAMELA was on for several hours and continuously since the 11th of July 2006. On September the 15th the commissioning phase of the RESURS was completed.

Flight data: 13 GV interacting proton

interacting antiproton Flight data: 41 GV interacting antiproton

Flight data: 70 GV positron

First results: pbar/p ratio To be published soon in Phys. Rev. Lett.

First results: proton flux & solar modulation Flux (P/(cm^2 sr GeV s)) Blue: July 2006 Red: August 2007 Kinetic energy (GeV)

Nuclei detection (calorimeter)

Nuclei detection (tracker)

Preliminary measurement: B/C

PAMELA on beam PAMELA was optimized for detecting cosmic antimatter, so Z=1 particles; Before delivery to Russia several beam tests at CERN/SPS were performed (p, e-, m, p); No time for light nuclei calibration before the flight; Nuclei calibration postponed after launch with the Technological Model test response of electronics to high deposits (deviations from linearity) evaluate charge resolution for every detector tune MC simulations tune analysis algorithms

February 2006 GSI test beam Particle Energy (MeV/n) Target Angle (°) Events 12C 1200 269896 × 123194 200 45 30378 196139 50Cr 500 15976 173960 52241

Why a new test beam? In Feb. 2006 we were parasites, so we could not optimize particles, energies and fluences; No CALO under test; HV settings for PM not representative of the flight situation; Not enough statistics for nuclei from fragmentation.

Our new set-up E.M. Calo beam S1 S2 S3 80 cm 40 cm Magnetic Spectrom. E.M. Calo beam S1 S2 S3 80 cm 40 cm Global dimensions: 0.5 x 0.5 x 1,5 m3 (electronics included) Weight : about 50 kg

Our requests (dreams’ list) Particle (Z) Energy (MeV/u) Shifts 2 E_1 1 3 4 5 E_2 6 E_1 : energy > 200 MeV/u E_2 : energy > 200 MeV/u and different from E_1 Fluences : not more than 100 particles/s Minimal request : 2 different particle types !!

Thank you in any case! Visit PAMELA web site  http://pamela.roma2.infn.it