EMULSIONS ET DE/DX Quelle est la sensibilite des emulsions OPERA

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Presentation transcript:

EMULSIONS ET DE/DX Quelle est la sensibilite des emulsions OPERA au pouvoir ionisant des particules ? Peut-on l ‘ utiliser apres le scanning automatique ?

JAPON : comptage grain 600MeV/c π G.D = 35.8±0.8 dE/dX (MeV g-1cm2) Momentum(GeV/c) G.D P π 400MeV/c π　 G.D = 36.4±0.4 600MeV/c　π　 G.D = 35.8±0.8 740MeV/c　π　 G.D = 36.1±1.0 1140MeV/c　π　 G.D = 36.4±0.7 600MeV/c　 p G.D = 80.1±1.0 740MeV/c　 p G.D = 64.1±0.6 870MeV/c　 p G.D = 57.2±0.6 1140MeV/c　 p G.D = 47.5±0.7 Typically total length of measurement is ~9mm and total number of tracks is ~7 tracks. G.D was calibrated by 600MeV/c πof 400MeV/c film . Error is about size of symbol. G.D = 242 　　　　 dE/dX =10.0

dE/dX - Grain Density Grain Density is proportional to dE/dX. dE/dX (MeV g-1cm2) 　　Ｇ．Ｄ ●:proton ●:pion Reference UVSOL e : G.D = 37.9 Grain Density is proportional to dE/dX. But not exactly proportional . Error is about size of symbol, only statistical error. I will estimate systematic error.

VPH measurement Result for ~0.0rad tracks (Average VPH of track connected 15 ~ 17 plates) 0.4 GeV/c 0.5 GeV/c 0.6 GeV/c 2.0 GeV/c Entry 511 tracks Entry 631 tracks Entry 677 tracks Entry 1219 tracks π π π P&π P P P D D 0.74 GeV/c 0.87 GeV/c 1.14 GeV/c 2.0 GeV/c Entry 637 tracks Entry 1063 tracks Entry 979 tracks Entry 898 tracks π π π P P P&π P D D D D ※ D is Deuteron At 2 GeV/c , proton and pion are not separated in 15~17 OPERA films.

VPH - Grain Density Ｇ．ＤＶＰＨ VPH-dE/dX VPH-G.D P π G.D >100 　　　Ｇ．Ｄ ●:proton ●:pion reference UVSOL e : G.D = 37.9 ＶＰＨ dE/dX (MeV g-1cm2) Momentum(GeV/c) VPH-dE/dX VPH-G.D P π In MIP-740MeV/c Proton region G.D >100 VPH = 1285 dE/dX = 10.0 Error is about size of symbol. VPH of proton below 600MeV/c is saturated. Error is about size of symbol. In MIP-740MeV/c Proton region, VPH is proportional to Grain Density.

　　　Ｇ．Ｄ ●:proton ●:pion reference UVSOL e : G.D = 37.9 ＶＰＨ VPH-G.D

Sensibilite sysal au de/dx

Simulation SYSAL variable: somme top+ bottom du nombre de clusters apparteneant aux 2 microtraces formant une trace base 1 seule mesure Moyenne 10 mesures 1: M.I.P 2: Proton 870 Gev/c 1+2

m.i.p Proton 870 Gev/c Proton 1140 Gev/c