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

2. 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

3. 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.

4. 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.

5. VPH - Grain Density Ｇ．Ｄ ＶＰＨ 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 = 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.

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

7. Sensibilite sysal au de/dx

8. 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

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