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Results from the ANTARES neutrino telescope. G. Giacomelli University of Bologna and INFN Venezia , 27/4/ 2011. Introduction.   astronomy ANTARES. Optical detection. Infrastructure Downgoing muons Preliminary n m data Exotica (Fast MMs, Nuclearites,…) Earth-Sea Science

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results from the antares neutrino telescope
Results from the ANTARES neutrino telescope

G. Giacomelli

University of Bologna and INFN

Venezia, 27/4/ 2011

  • Introduction. astronomy
  • ANTARES. Optical detection. Infrastructure
  • Downgoing muons
  • Preliminary nm data
  • Exotica (Fast MMs, Nuclearites,…)
  • Earth-Sea Science
  • Conclusions. Outlook

ANTARES Results-Venezia 2011

slide2

High energy neutrino astrophysics:Galactic: SN, SNRs, m-quasars, molecular clouds, ...

Extra-Galactic: AGNs, GRBs, dark-GRBs, GZK, ....

  • Searches for New Physics:

Dark matter (Sun, GC), Magnetic Monopoles, ??

  • Earth-Sea Science: Oceanography,seabiology, seismology, environmental monitoring

1. Introduction Science with Deep Sea Neutrino Telescopes

ANTARES Results-Venezia 2011

slide3

Neutrino Astronomy

  • Advantages w.r.t. other messengers - -Photons: interact with CMB and matter
    • Protons: interact with CMB and are deflected by magnetic fields
    • Neutrons: are not stable
  • Drawback: large detectors (~GTon) are needed.

photon

n



p

ANTARES Results-Venezia 2011

sky observable by he neutrino telescopes

CRAB

CRAB

VELA

SS433

SS433

Sky Observable by HE Neutrino Telescopes

AMANDA/IceCube (South Pole)

ANTARES/KM3 (43° North)

Mkn 421

Mkn 501

Mkn 501

RX J1713.7-39

GX339-4

Galactic

Centre

ANTARES Results-Venezia 2011

2 antares site infrastructure
2. ANTARES Site & Infrastructure

-2475m

Shore Station

IFREMER Toulon Centre

40 km submarine cable

FOSELEV Marine

ANTARES Results-Venezia 2011

antares optical detection of n m
ANTARESOptical detection of nm

43°

m-

interaction

nm

ANTARES Results-Venezia 2011

slide7

Buoy

2 ARS

LCM

1 MB per PMT

14.5 m

3 PMTs

LCM

Sector

LCM

448 m

MLCM

2.5 km

LCM

40 km

cable

to shore

Storey

SCM

Junction

box

Seabed

acoustic positioning

Storey 1

Storey 8

Storey 14

Storey 20

Storey 25

AcousticPositioning

Measure every 2 min:

Distance line bases

to 5 storeys/line

and also storey

headings and tilts

Radial displacement

Precision ~ few cms

ANTARES Results-Venezia 2011

two events
Two Events

reconstructed up-going neutrino:

detected in 6/12 detector lines:

reconstructed down-going muon: detected in all 12 detector lines:

ANTARES Results-Venezia 2011

example neutrino candidate
Example: Neutrino candidate

height

time

ANTARES Results-Venezia 2011

slide11

Example of a muon bundle

height

time

ANTARES Results-Venezia 2011

3 downgoing muons depth intensity relation from zenith distribution

2,5km

6km

3. DowngoingmuonsDepth Intensity Relation from Zenith Distribution

Astropart. Phys. 34 (2010) 179

ANTARES Results-Venezia 2011

Zenith angle distribution of muon flux at 2000 m

moon shadow
Search for deficit of downgoingmuons

In the direction of the moon

(diameter 0.5 degrees)

Verification of the absolute pointing of

the telescope

Preliminary:

Live time 295 days:

2.5 sigma effect

Moon Shadow

preliminary

ANTARES Results-Venezia 2011

4 preliminary data for upgoing neutrinos angular resolution
4. Preliminary data for Upgoing NeutrinosAngular Resolution

2007+2008 analyses:

Angular resolution ~ 0.5°0.4°

(ΔΘ < 1° , in 75% of cases)

- Integrated over all energies (E-2 flux)

- Half of data only 5 lines

Full 12 line detector

m

n

ANTARES Results-Venezia 2011

sky map
Sky Map

Selection optimized for Model Discover Potential (Λ >-5.4):

(Live time 295 days)

galactic coordinates

visibility

2190 selected events

Most significant cluster located at: ra=134.6°, δ=13.4°

(post-trial probability to be background 2.4%)

ANTARES Results-Venezia 2011

point source limits
Point Source Limits

Quoted for E-2 flux

ANTARES-best limits in the

Southern sky

More data (2009-2010)

on tape

Expect further improvement

energy estimator included

ANTARES Results-Venezia 2011

high energy diffuse n m flux
High Energy Diffuse nm flux

E2F(E)90%= 5.3×10-8 GeV cm-2 s-1 sr-1

20 TeV<E<2.5 PeV

“Search for a diffuse flux of high-energy νμwith the ANTARES n telescope”

Phys. Lett. B696 (2011) 16-22.

ANTARES Results-Venezia 2011

5 exotica preliminary fast intermediate mass magnetic monopoles
5. Exotica (preliminary)Fast Intermediate Mass Magnetic Monopoles
  • Required in many models of spontaneous
  • symmetry breaking
  • Upgoing  masses less than ~1014 GeV
  • High photon yield (8.5x103 times μ)
  • Cherenkov threshold b >0.74
  • Delta rays for b ≥ 0.5
  • Track reconstruction with b free

MM-Cherenkov

MM-delta rays

muon

Monopole

muon

neutrino

ANTARES Results-Venezia 2011

6 earth sea science seismograph japan earthquake
6. Earth-Sea Science Seismograph: Japan Earthquake

40

20

0

-20

-40

In laboratory

Deployment

Buried at site

amadeus acoustic detection of neutrinos

neutrino

Hydrophone Array

Cascade

Acoustic Pressure Waves

AMADEUS: Acoustic Detection of Neutrinos
slide21

Biocamera

2 min

Bursts:

bioluminescence from

Macroscopic organisms

40K

slide22

7. Conclusions - Outlook

  • The 12 line ANTARES detector is taking data, also with several instruments for Earth Sea Sciences studies.
  • The collaboration has shown capable response for solving
  • technical difficulties (ex.: the breaking of the connecting cable)
  • Compared to AMANDA-IceCube, ANTARES completes the coverage of the neutrino sky, with an angular resolution of 0.5°
  • First analyses of the downgoing muons allowed calibrations and measurements of the flux; comparison with MC with 30% sis err
  • First analyses of neutrinos with 5-12 lines for data taken in
  • 2007-2008 allowed a first search for cosmic point-like sources.
  • A search was made for a diffuse flux of H.E. muon neutrinos
  • ANTARES sensitivity for point sources is comparable to AMANDA
  • First tentative results in Earth and Sea Sciences
  • The technical success paves the way to KM3NeT in the Mediterranean

ANTARES Results-Venezia 2011

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