Status of the EEE telescopes in Catania Paola La Rocca II Conferenza dei Progetti del Centro Fermi...

Status of the EEE telescopes in

CataniaPaola La Rocca

II Conferenza dei Progetti del Centro Fermi

Rome - April 20th, 2012

http://www.centrofermi.it/centro/index.html

II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012

3.05 Km

The EEE telescopes in Catania 1/42 telescopes (CT-01 and CT-

02) 3.05 km apart



TEL CT-01 TEL CT-02

Latitude 37° 31’,500 N 37° 29’,325 N

Longitude 15° 04’,046 E 15° 03’,064 E

Altitude 210 m a.s.l. 110 m a.s.l

Distance between chambers

80 cm 80 cm

Orientation w.r.t. NORTH

60 ° 300°

Position inside the building

Underground floor (5 concrete roofs above the telescope)

Ground floor (light roof above the telescope)

The EEE telescopes in Catania 2/4

Running from April 2008

Acquisition rate ~ 22 Hz Collected data ~ 2 x109 events

CT-01 Telescope(Department of Physics)




CT-02 Telescope(Istituto Tecnico S.Cannizzaro)

Running from December 2008

Acquisition rate~ 20 Hz Collected data ~ 1 x 109 events



- “Corso di eccellenza” (2008-2009)

- “Corso di Grid Computing” (2010)

- “Corso di Fisica delle Alte Energie” (2011)

- PON Project “Raggi Cosmici in Classe” (2012)

Lessons and advanced courses

Activities in the schools 1/3



- Web Site (eeecatania.tk)

- Participation to Local and national Conferences on Science

- Local newspapers

Web and Media




Prof. A.Zichichi at ITIS Cannizzaro



- Barometric effect

- Observation of a Forbush decrease

Study of the muon flux

Some scientific results obtained with the EEE telescopes in Catania

- Short-distance correlations (EEE telescope + scintillator)

- Detection of EAS with EEE telescopes

Study of correlations between telescopes



The muon flux measured at the sea level changes with the atmospheric pressure

Study of the Barometric Effect

Counts/h

Atm. Press. (mbar)

~ 7 daysII Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012


Forbush decreaseValentine’s day solar flare (Feb. 2011)

Moscow Neutron Monitorhttp://helios.izmiran.troitsk.ru/cosray/main.htm



The solar flare as observed by the CT-01 telescope

Pressure

Rate

Corrected rate


TIME



Correlation between the counting rate measured by the Oulu neutron monitor and the CT-01 telescope


Neutron Monitors limits:- Sensitive to low energy neutrons- No information about neutrons orientation

Use of muon telescopes/hodoscopes for Forbush decreases:- Possibility to study the dependence of the Forbush effect upon the zenithal angle of the muonsII Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012

Angular dependence of the amplitude variation


Muons arriving with a larger zenithal angle are supposed to be associated to higher-energy primaries


Short-distance correlations (<500m) between EEE telescopes and scintillators

PT

P-1

P-2

P-3

Roof

EEE Telescope

Small scintillator telescope



Astroph. Obs.

450 m

22 d

Dept. of Phys.

25 m 3 d36 m 1,5 d

82 m 11 d

INFN LNS 146 m 10,5 d

d = 36 m

d = 82 m

d = 25 m


T T

T


d = 146 m

d = 450 m


TT


Dechoerence CurveIt can be used to evaluate the expected coincidence rate between 2 EEE telescopes


Rate not corrected for efficiency and acceptance


Detection of EAS with EEE telescopes in Catania

15 x 106 events


More statistics100 x 106 events

No Time CorrectionRelative angle < 25°


Rate ≈ 1 coinc/day

Outlook- Comparison with results from different EEE sites

- Comparison with simulations

CERN15 m

L’Aquila200 m

Cagliari520 m

Frascati600 mCatania

3050 m


Status of the EEE telescopes in Catania Paola La Rocca II Conferenza dei Progetti del Centro Fermi...

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