Radio-detection detection of UHECR by the CODALEMA experiment
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1 Radio-detection detection of UHECR by the experiment SUBATECH, Nantes, France and the collaboration
2 setup Scintillator array (trigger) Trigger : 5 central scintillators in coincidence Internal air showers : Energy Known 30 % of uncertainty Dipole array EW polarization of the Electric field
3 Statistics since December 2006, new setup Effective time : 170 days Multiplicity >= 3 ( 3 antennas tagged at least) : 613 events Multiplicity >= 3 + time and angular coincidence between both arrays 141 cosmic ray showers radio-detected Counting rate : 0.8 events/day 43 showers with energy known (Internal)
4 Energy distribution Number of events, dn/de radio Scintillator Log E (ev) Histogram not corrected for the acceptance
5 radio adio-detection detection efficiency (with one Electric field polarization measured) Efficiency
6 Scintillator distributions (internal showers) Shower arrival directions calculated with the scintillator data Azimutal distribution Energy threshold for scintillator array ~ ev Zenithal distribution Limited at θ < 50
7 Shower arrival directions 141 radio-detected showers in coincidence with particle detector array Antenna data Shower deficit in the South direction Small number of events around the Geomagnetic field direction Geomagnetic Nançay θ = 27,φ =180
8 Geomagnetic effect Geomagnetic field shower α South North α : angle between Geomagnetic field and cosmic ray arrival direction Corrected for the triggered events distribution dn/dα
9 Air showers detected from the South are more energetic Geomagnetic effect / Energy Energy known only for «internal showers» (CIC method, precision 30 %) 43 internal showers Log E > < Log E < < Log E < < Log E < 17.1 Geomagnetic Nançay θ = 27,φ =180
10 Geomagnetic effect / Energy Energy known only for «internal showers» (CIC method, precision 30 %) Low counting rate around the Geomagnetic field Deficit of low energy events for small α Evidence for a geomagnetic effect in the radio emission process (not only geosynchrotron)
11 Electric Field Topology Exponential dependence ε = ε o exp(-d/d o ) E = 2x10 17 ev εlectric field (µv/m/mhz) ε o = 25 µv/m/mhz Axis distance (meter)
12 Electric Field Topology Exponential dependence ε = ε o exp(-d/d o ) E = 8x10 17 ev More statistic needed to correlate ε o and Energy εlectric field (µv/m/mhz) ε o = 73 µv/m/mhz Axis distance (meter)
13 Electric Field Topology Giant event (Energy above ev) Unfortunately not internal HUGE electric field! εlectric field (µv/m/mhz) ε o = 278 µv/m/mhz Axis distance (meter)
14 CONCLUSION radio detection efficiency increases with energy Evidence for a Geomagnetic effect radio-detection deficit close to the Geomagnetic field direction effect on the radio-detection efficiency around ev constraint on the emission process Detection of all polarization could help At the present time, we do not see clear correlation between the cosmic ray Energy and the measured electric field Larger autonomous antennas array (in Nançay)
15 @ ICRC 2007 see also 3 posters Radiodetection of astronomical phenomena in the cosmic ray dedicated experiment Jacob Lamblin Design and performance of a fully autonomous antenna for radio detection of extensive air showers Benoît Revenu Radio detection of High-Energy cosmic rays at the Pierre Auger Observatory A Van Den Berg
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