I.Laktineh GranSasso MAY 2003 Stopping / at PSI dE/dX Measurement Bern, Naples,Neuchatel,Lyon Aim:...
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Transcript of I.Laktineh GranSasso MAY 2003 Stopping / at PSI dE/dX Measurement Bern, Naples,Neuchatel,Lyon Aim:...
![Page 1: I.Laktineh GranSasso MAY 2003 Stopping / at PSI dE/dX Measurement Bern, Naples,Neuchatel,Lyon Aim: to identify stopping pions and muons in the bricks.](https://reader036.fdocuments.us/reader036/viewer/2022080917/56649ebc5503460f94bc466f/html5/thumbnails/1.jpg)
I.Laktineh GranSasso MAY 2003
Stopping / at PSI dE/dX Measurement
Bern, Naples,Neuchatel,Lyon
Aim: to identify stopping pions and muons in the bricks using the dE/dX information.what is the difference with the Japanese attempt? In Europe we can obtain almost a pure beam of pions (muons) at PSI. no need for a sophisticated setup
This will allow more efficient characterization specially with he European scanning system (access to grain information)
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At PSI we can use two beam linesPions beam PiM1 with strict cuts on the momentum
P = 200 MeV
Muon beam MuE1
P = 120 MeV muons produced from pion decay
collected in a solenoid.
(more information available on the PSI website)
Purity of each beam is about 99 %
Thanks to Urs, things can be done easily but we have to decideNOW
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x(µ)
y(µ)
x(µ)
z(µ)
Muons(without decay products)
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Pions(without decay products)
z(µ)
x(µ)
x(µ)
y(µ)
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The mean distance of the pions in the brick is 5 cmThe mean distance of the muons in the brick is 2.5 cm Rate: from 100-1000 particles/ cm2
Strategy to follow
Take two bricks (or two half-bricks with lead in front)add 2-3 emulsion sheets together in the front (inside ?)( to cut bgk)
Expose each to both beamsone half for the pions, one half for the muons ( to reduce systematic)
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Brick preparation and development at cern (Gianni)Scanning in Lyon, Bern and also in Naples laterInvolved persons: Urs, Jerome, Igor, Samuel, Frederic, Markus, Imad, Perrine, Giovanni, NicolaDevelopment (thickness? More than 44 microns if possible)
When ? July seems to be the best for allScanning:Lyon : (at least 50% of time)Bern : (at least 80% of time)Naples : ?
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Conclusions
• Tough but challenging and necessary study for OPERA
• We are collaborating with our Japanese colleagues in order to get profit of their experience (Toshito)
• The European scanning system advantages can be tested
• This study is necessary for the exotic decay of the Lead proposed by the Bologna group (see Miriam talk)
WE REQUEST TWO BRICKS FOR JOLY (if possible)