NEWS: measurements at sub keV energies with spherical detectors G Gerbier + I Giomataris, J Derre, P Magnier, A Dastgheibi, D. Jourde, M Gros, E Bougamont, XF Navick, T Papaevangelou, J Galan, G Tsiledakis IRFU–Saclay on behalf of NEWS collaboration Introduction to the detector Low energy investigations -preliminary- Calibrations, characterisation Measurements at LSM NEWS : neutrino coherent scattering measurement 6th TPC Symposium- Paris-2012 1
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NEWS: measurements at sub keV energies with spherical detectors G Gerbier + I Giomataris, J Derre, P Magnier, A Dastgheibi, D. Jourde, M Gros, E Bougamont,
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NEWS: measurements at sub keV energies with spherical detectors
G Gerbier + I Giomataris, J Derre, P Magnier, A Dastgheibi, D. Jourde, M Gros, E
Bougamont, XF Navick, T Papaevangelou, J Galan, G Tsiledakis IRFU–Saclayon behalf of NEWS collaboration
Introduction to the detectorLow energy investigations -preliminary-
NB : 2009 measurement with 130 cm SPC => 0.045 Hz Po210
Degasing of valves ?
218Po
214Po
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• Example of two 50 mb & 300 mb runs (<24h, non stable conditions)
Data with « SEDINE » the 60 cm low activity detector @ LSM – « Low energy »
Monte carlo simulations on going : see G Tsiledakis talk
eV
keV
« Electron track » spectrum (high RT) evts/kev.d
23 keV
3 keV
300 mb
50 mb
Localised energy deposition in volume Need volume calibration to estimate
cuts and background level Need better estimator for rejectionevts/kev.d
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Detecting ALPs ?• Axion Like Particles KK postulated to explain high
temperature corona of sun (Zioutas/di Lella, 0207073v1)
• => should decay in 2 gammas with spectra < 3 keV @ rate = 200 /d/m3
• Analysis of pulse shape provide signature• Tests runs in Saclay with 130 cm SPC on-going
derivative
Pulse of 6 keV 55Fe source
Working on background rejection and simulation : J Galan and T Papaevangelou GG IG
a1/a2a1
a2
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CEA-IRFU/Saclay (GG,IG) ,LSM (F Piquemal), Aristotle University of Tessaloniki (I Savvidis), University of Ioannina (I Vergados), NCSR DemoKritos (G Fanourakis), Hellenic Open University (S Tzamaria) University of Tsinghua Beijing (C Tao), Shanghai Jiao Tong University (K Ni), IHEP-Beijing ( C Yang)University of Saragoza (I Irastorza), Livermore (JR Armendariz)
New Experiments With SpheresNeutrino Experiments With SpheresNew Experiments for Wimps with Spheres
• F : R&D at Saclay and LSM, sensors, high P• F : Coherent neutrino scattering experiment
feasibility (ERC submitted by IG/GG)• G : Neutron monitor (I Savvidis next talk) • C : R&D with SPC 130 cm shipped to Beijing,
investigating large sphere building / tests• F G C : SN monitor, DM …