Transcript Highligh in Physics 2005

Congresso del Dipartimento di Fisica
Highlights in Physics 2005
11–14 October 2005, Dipartimento di Fisica, Università di Milano
Icarus: a multipurpose detector; the simulation codes
G.
*
Battistoni , A.
*†
Ferrari ,
S.
*
Muraro
and P.R.
*
Sala
*INFN
sezione di Milano
†on leave at CERN
The ICARUS experiment has a vast physics program, including proton decay, and neutrino oscillations from natural and artificial sources. The so-called T600 detector,
composed by two modules, 300 tons of Liquid Argon each, is now in the Gran Sasso Hall B and will be operational next year
Ionization in LiquidArgon
light
3m
The detection Principle :
LAr Time Projection Chamber:
An electronic bubble chamber with 3mm
resolution + calorimetry
Ionizing Track
Drift in E field
Induced/collected signals
on wire grids
Drifting
2-dim views: wire vs. drift
time
e-
3-d reconstruction with 3
wire planes
Proton decay : a test of baryon
Number conservation. Important for
GUT theories and
matter-antimatter asymmetry
To identify p decay in an Ar
nucleus, It is essential to
understand and reproduce nuclear
effects, such as Fermi motion,
binding energy, reinteraction of
decay products inside the nucleus:
Handled by the FLUKA nuclear
model
Hadronic Interaction. Real event in 2001 test
_
FLUKA simulated proton decay event
e+
In T600



K [AB]   [BC]  e [CD]
K+
p  K+ e
FLUKA is an interaction and transport
MonteCarlo code, used for many
applications from high energy physics
to microdosimetry. It is an INFN-CERN
project. Special
developments/applications for ICARUS
from INFN-Milano and CERN
+
K+
p=425 MeV
µ+
Run 939 Event 46
e+
Real event with K decay
CERN Neutrino to Gran Sasso: ν beam from 400GeV
proton beam, 732 km path to Gran Sasso Laboratory.
Main aim is
the direct detection of τ neutrinos from νμ → ντ oscillation
FLUKA simulation includes all details of beam transport,
interaction, structure of target, horn focusing, decay, etc.
Used for engineering calculations and for the prediction of ν
fluxes at Gran Sasso
CNGS beam line
Oscillation of atmospheric ν has
been detected in the
SuperKamiokande experiment.
However, a better understanding
of theoretical flux and experimental
systematics would be welcome
Three flavor oscillations with
matter effect, for νμ→νe studies
in view of the determination of
the theta13 parameter have
been recently coupled to CNGS
and atmospheric analysis
The plot shows the expected νe
and ντ spectra for the CNGS
beam, with and without 3-F
oscillation
Fluka simulations of cosmic showers in
atmosphere, including geomagnetic
effects have been set up and checked:
here muon spectrum at ground level,
simulated (line) and expt (dots)
FLUKA simulated νμ flux
Result: first full 3-D simulation of
atm. ν
Coupled to simulation of ν interactions,
with nuclear effects, and full ICARUS
simulation of tracks in the detector
References
S. Amerio et al. (ICARUS coll.) NIM A 527, 329 (2004)
P. Aprili et al (ICARUS coll.) LNGS-P28/2001 and CERN-SPSC-2002-027
A. Fasso et al. FLUKA, CERN yellow report , INFN/TC_05/11, in press;
A. Fasso et al., arXiv:hep-ph/0306267;
www.fluka.org
G. Acquistapace et al., NGS, CERN-98-02 (1998); R. Baldy et al., INFN/AE-99/05 and CERN SL99-034 DI (1999)
A. Ferrari et al., Nucl. Phys. B - Proc.Suppl. 145,93 (2005)
G. Battistoni et al., Astropart. Phys 12, 315 (2000); Astropart. Phys. 19,269 (2004); Astropart. Phys.
17, 477 (2002)
ICARUS upgraded analysis , ICARUS TM/05-04