May 26 – 30, 2008
Biblioteca Universitaria, Pavia, Italy
Europe/Rome timezone

Electromagnatic shower reconstruction with emulsion films in the OPERA experiment

May 28, 2008, 9:40 AM
Salone Teresiano (Biblioteca Universitaria, Pavia, Italy)

Salone Teresiano

Biblioteca Universitaria, Pavia, Italy

Strada Nuova, 65
oral presentation Astrophysics and neutrinos Astrophysics and neutrinos


Dr Frederic Juget (Université de Neuchatel)


OPERA is a long-baseline neutrino oscillation appearance experiment designed to
obtain an unambiguous signature of $\nu_{\mu} \rightarrow \nu_{\tau}$ oscillation. The detector, located in the
underground Gran Sasso Laboratories,
plans to detect $\nu_{\tau}$'s in the CERN to Gran Sasso (CNGS) $\nu_{\mu}$
which is optimised for $\nu_{\tau}$ appearance.
OPERA is an hybrid experiment with electronic detectors, iron magnets and Emulsion
Cloud Chambers (ECC).
The ECC combines in one cell the high tracking precision of nuclear emulsions
($\sim$0.1 $\mu$m) and the large
target mass of the lead plates. The basic element, the ``brick'', has
dimensions of 12.7$\times$10.2$\times$7.5 cm$^3$; it is a sequence of 56 lead (1
thick) and 57 emulsion films
(44 $\mu$m thick emulsion layers on either side of a 205 $\mu$m plastic base). The
total length of an OPERA ECC
module is about 10 $X_0$.
In addition of its very good tracking information capabiliy,
allowing for instance the detection of short-lived particles, the
ECC can be used as a fine sampling
electromagnetic calorimeter. We will report the method developped to reconstruct the
electromagnetic showers with ECC and the energy measurement in the 1-10 GeV
The achieved energy resolution
is about $\frac{\sigma_E}{E}= \frac{40\%}{\sqrt(E)}$.
We will also
present the momentum measurement of the charged hadron using Mutiple Coulomb
Scattering used for the
hadronic shower reconstruction.

Primary author

Dr Frederic Juget (Université de Neuchatel)

Presentation materials