ORCA (Antarctic Cosmic Ray Observatory): 2018 Latitudinal Survey
Résumé
A set of detectors devoted to investigate secondary cosmic rays has performed a latitudinal observation from Vigo (Spain) to Juan Carlos I Spanish Antarctic Station (Livingston Island, Antarctic Peninsula) aboard the Sarmiento de Gamboa oceanographic vessel from November $14^{th}$ to January $2^{nd}$. The experiment is split into two modules, one composed by a stack of 3NM64, three BF3 bare counters (NEMO) and a muon telescope (MITO) with a mini neutron monitor in a $20^{\prime}$ maritime container on the Sarmiento de Gamboa$^{\prime}$s deck and a second module (TRISTAN) consisting of a set of 3 RPC planes with a lead layer in between the second and the third plane placed in a separate temperature controlled room below the ship$^{\prime}$s deck. The complete set of instruments is the Antarctic Cosmic Ray Observatory (ORCA) that has been be installed in the Juan Carlos I Spanish Antarctic Base in Livingston Island (Antarctica). The latitudinal survey took ORCA throughout the South Atlantic magnetic anomaly along the Brazilian coast. ORCA is able to measure fluxes of neutrons of different energies, charged particles (mostly muons) and muon incident directions on the detector surface. In this work, we present the preliminary results of the latitudinal survey.