E362 FD weekly meeting, 
R201, 96/08/20 (Tues), 10:00-12:00,  
Present:Chikamatsu(INS),Ohyama,Ishida,Sakuda(KEK),
        Kohama(Kobe),Maruyama(Tohoku). 

(1) Chikamatsu shows the preliminary study of electron/muon separation 
using the number of hits of SCIFI. An electron track produces shower, while
a muon track does not. For example, for 0.5 GeV muon and electron tracks
muon contamination is 4% with 92% electron efficiency if he requires
more than 3 hits at one of layers along the track. Previously, he showed 
that electrons can be identified with 20-30% energy resolution. 
 Leak test for F/B muon chambers will be finished next Month. Currently,
14 sets out of 33 sets are done. 

(2) Etou reports from Nagaya (NagoyaU/KobeU/Etou) that they have finished 
making all fiber ribbons. Some of them have the reflection surface at the 
other end using aluminum sputtering. (As of Aug.21) 

(3) Nakamura(Niigata) reports from Niigata the analysis of nu-e/nu-mu ratio.
In 1-track sample, 
nu_e QE events: 308 (4-pi, @10**20POT) 
                 81 1-track events hitting LG
             *   21 for E-LG>0.8 GeV
nu_mu events  :160K (4-pi @10**20POT)
                9152 1-track events hitting LG
             *  320 for E-LG>0.8 GeV
Thus, the identification of nu_e events using 1-track is far from possible.
In 2-track sample, he obtains 11 nu_e events with 2 nu_mu background after cuts.
In responce to the question raised at the meeting, "what happens if he removes
the cut-1 (no hits on trigger counters before muon chambers)?";
He gained 40% more nu_e events, but had 4 times more background events. So,
the cut-1 seems important.

(4) Fujii updates the result of the simulation of nu_e/nu_mu ratio using 
sampling calorimeter. Although he did not take into account the effects of
water (shower loss and energy loss), he obtains 130 nu_e events and 286 
nu_mu background events. Most of the background events are high energy 
protons producing hadronic shower in LG. So, he proposes to have the lucite
Cherenkov counters in front of LG. 
  
(5) Ishida made nice figures and short descriptions of the E362 experiment
for the KEK open house (96/09/15). 
 He will work on the simulation of nu_e/nu_mu ratio measurement.

(6) Nakamura (KEK) asks each hardware group to bring as much information
as possible necessary for the specification document of the experimental hall.
The preliminary deadline is August 26. 

(7) Sakuda/Ohyama will visit Furukawa-Electric Co to talk about 
the aluminum water cell this week. We asked Kawai-optics Co to put aluminum
vapor at one end of the fiber ribbons. Etou sent the sample to the company.
Japan Bicron suppied us with 0.7mmD multi-clad fibers for bench test.

(8) Kobe group (Echigo/SuzukiAT) reports that the results of the light yield 
measurement presented at Aug.5-6 were wrong. The results now agree with those 
by Etou and they are reproducible. They are preparing for the aging test.
// (Memo by Sakuda)