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Reconstruction of neutrino interactions in PEANUT in general scanning (unbiased) mode Giovanni De Lellis on behalf of Andrea Russo Naples University
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PEANUT detector BL033 Neutrino beam and Cosmic ray exposure BeamPositionStartEndDuration (day) NEUTRINO1412005/10/20 16:252005/11/07 09:2017.75 COSMIC RAYS2005/11/07 09:402005/11/07 11:400.08 (2h)
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Scanning areas All 57 plates have been general scanned: 5.55 x 4.30 cm^2 = 23.9cm^2 General scanning mode Measured density of aligned base-tracks: 4 base-track / mm 2 (transportation order) 0.7 base-track / mm 2 (assembly order) 38 plates have been general scanned: 11.1 x 4.30 cm^2 = 47.8 cm^2
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PEANUT emulsions Transportation order Beam exposure
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s ~ 8 m m Track reconstruction s =13 mrad Micro-track angular resolution Position and angular resolution in the plate to plate alignment Consecutive base-track accuracy s ~ 5 mrad
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s = 0.7 m m s = 3mrad Base-track resolution: spatial and angular difference between a base-track and the corresponding volume track
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Density of aligned base-tracks ~ 4/ mm 2 Track reconstruction in transportation order
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Characterization of the tracks in transportation order Due to low momentum protons (~100MeV) High ionizing power (at least 10 segments in the following plots) High tracking efficiency
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Beam tracks at least 4 segments in the plots shown NuMI beam peak ( x, y ) ~ (-50,0) mrad MIP particles: ~ 24 Tracking efficiency Density of aligned base-tracks ~ 0.7 / mm 2
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Emulsion-SFT matching yx txty x = 1190 m y = 1240 m tx = 5 mrad ty = 8 mrad Angular misalignment
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Brick rotation beam = 24 mrad 2.4 mm SFT planes brick z depending on the position zz Top View
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Emulsion-SFT matching after z correction x = 605 m y = 443 m tx = 6 mrad ty = 5 mrad
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Impact parameter and z distribution track to vertex longitudinal distance IP zz ~ 60% up to 10 µm
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Neutrino event identification 62278 volume tracks reconstructed 2995 vertices reconstructed 658 with all forward tracks 17 confirmed by SFT (154 “ z versus IP” ) 7 pass the “ z versus IP” cut 11765 made of more than 4 base-tracks 171 confirmed by SFT 17 with UP > 3 Identification of 24 neutrino interactions in the fiducial volume Single track eventsMultiple track events MC Multiplicity
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“High” multiplicity events not matching the SFT dz ( m)ip ( m) 6971.2 6970.4 19888.2 dz ( m)ip ( m) 9122.4 22030.8 9122.3 dz ( m)ip ( m) 9413.4 222610.0 9413.9 tx (mrad)ty (mrad) -26244 156-126 -99379 tx (mrad)ty (mrad) 394-231 -642-2 355-402 tx (mrad)ty (mrad) -381-380 116-131 -43-716
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“High” multiplicity events not matching the SFT dz ( m)ip ( m) 204118.1 204120.1 204122.1 dz ( m)ip ( m) 13182.9 13184.2 13184.9 tx (mrad)ty (mrad) 67231 66-116 -13451 tx (mrad)ty (mrad) -3988 -101129 -4493
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“High” multiplicity events not matching the SFT tx (mrad)ty (mrad) 23432 84-169 269-316 -131198 Dz ( m)ip ( m) 10406.0 10404.1 10405.5 235843.3 dz ( m)ip ( m) 5820.3 5820.7 5821.0 tx (mrad)ty (mrad) 90-257 -1441 82229
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“High” multiplicity events not matching the SFT tx(mrad)ty(mrad) 23-191 -48148 264-121 193188 -33134 -20472 -180-303 2-388 16242 dz( m)ip( m) 169910.3 169910.9 16998.1 16995.0 16995.1 16993.9 16996.6 169923.0 169915.4 Preliminary Multiplicity 9!
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Expected number of events in the brick BeamBeginEndDuration (days) NEUTRINO2005/10/20 16:252005/11/07 09:2017.75 COSMIC2005/11/07 09:402005/11/07 11:400.08 Neutrino interaction rate in an iron target exposed to NuMI in the near hall (2 * 10 5 ) / (year * ton) 43 ± 7 neutrino interactions expected in the analyzed volume N mes / total = 44 ± 9 neutrino interactions estimated from the 24 observed events after efficiency correction This value (increased by 8%) accounts for the lead target
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Conclusions A volume of 413 cm 3 (58% of the brick volume) was general scanned in one PEANUT brick Detailed single brick Monte Carlo simulation of PEANUT used to define a procedure to identify neutrino interactions 24 neutrino interactions with SFT matching have been identified in the volume After the efficiency correction, we estimate (44 ± 9) neutrino interactions happening in the volume Good agreement with the number of expected events (43 ± 7) computed from the flux 8 events with larger multiplicity found without any match with the SFT (6 with 3 tracks, 1 with 4 and 1 with 9 tracks)
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