%A(The DarkSide collaboration) Agnes, P.%AAlbuquerque, I.%AAlexander, T.%AAlton, A.%AAve, M.%ABack, H.%ABatignani, G.%ABiery, K.%ABocci, V.%ABonivento, W.%ABottino, B.%ABussino, S.%ACadeddu, M.%ACadoni, M.%ACalaprice, F.%ACaminata, A.%ACanci, N.%ACaravati, M.%ACariello, M.%ACarpinelli, M.%ACatalanotti, S.%ACataudella, V.%ACavalcante, P.%ACavuoti, S.%AChepurnov, A.%ACicalò, C.%ACocco, A.%ACovone, G.%AD'Angelo, D.%ADavini, S.%ADe Candia, A.%ADe Cecco, S.%ADe Filippis, G.%ADe Rosa, G.%ADerbin, A.%ADevoto, A.%AD'Incecco, M.%ADionisi, C.%ADordei, F.%ADowning, M.%AD'Urso, D.%AFiorillo, G.%AFranco, D.%AGabriele, F.%AGalbiati, C.%AGhiano, C.%AGiganti, C.%AGiovanetti, G.%AGorchakov, O.%AGoretti, A.%AGrobov, A.%AGromov, M.%AGuan, M.%AGuardincerri, Y.%AGulino, M.%AHackett, B.%AHerner, K.%AHosseini, B.%AHubaut, F.%AHungerford, E.%AIanni, An.%AIppolito, V.%AKeeter, K.%AKendziora, C.%AKochanek, I.%AKorablev, D.%AKorga, G.%AKubankin, A.%AKuss, M.%ALa Commara, M.%ALai, M.%ALi, X.%ALissia, M.%ALongo, G.%AMachulin, I.%AMapelli, L.%AMari, S.%AMaricic, J.%AMartoff, C.%AMessina, A.%AMeyers, P.%AMilincic, R.%AMorrocchi, M.%AMougeot, X.%AMuratova, V.%AMusico, P.%ANavrer Agasson, A.%ANozdrina, A.%AOleinik, A.%AOrtica, F.%APagani, L.%APallavicini, M.%APandola, L.%APantic, E.%APaoloni, E.%APelczar, K.%APelliccia, N.%APicciau, E.%APocar, A.%APordes, S.%APoudel, S.%APralavorio, P.%ARagusa, F.%ARazeti, M.%ARazeto, A.%ARenshaw, A.%ARescigno, M.%ARode, J.%ARomani, A.%ASablone, D.%ASamoylov, O.%ASands, W.%ASanfilippo, S.%ASavarese, C.%ASchlitzer, B.%ASemenov, D.%AShchagin, A.%ASheshukov, A.%ASkorokhvatov, M.%ASmirnov, O.%ASotnikov, A.%AStracka, S.%ASuvorov, Y.%ATartaglia, R.%ATestera, G.%ATonazzo, A.%AUnzhakov, E.%AVishneva, A.%AVogelaar, R.%AWada, M.%AWang, H.%AWang, Y.%AWesterdale, S.%AWojcik, M.%AXiao, X.%AYang, C.%AZuzel, G.%Anull Ed.%BJournal Name: ArXivorg; Journal Volume: arXiv:2107.08087 %D2021%I %JJournal Name: ArXivorg; Journal Volume: arXiv:2107.08087 %K %MOSTI ID: 10281343 %PMedium: X %TCalibration of the liquid argon ionization response to low energy electronic and nuclear recoils with DarkSide-50 %XDarkSide-50 has demonstrated the high potential of dual-phase liquid argon time projection chambers in exploring interactions of WIMPs in the GeV/c2 mass range. The technique, based on the detection of the ionization signal amplified via electroluminescence in the gas phase, allows to explore recoil energies down to the sub-keV range. We report here on the DarkSide-50 measurement of the ionization yield of electronic recoils down to about 180 eVer, exploiting 37Ar and 39Ar decays, and extrapolated to a few ionization electrons with the Thomas-Imel box model. Moreover, we present the determination of the ionization response to nuclear recoils down to ∼ 500 eVnr , the lowest ever achieved in liquid argon, using in situ neutron calibration sources and external datasets from neutron beam experiments. %0Journal Article