A 3D grid- like neutrino near detector with a water target, WAGASCI

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1 A 3D grid- like neutrino near detector with a water target, WAGASCI A. Minamino (Kyoto Univ.) 6 th Open MeeGng for Hyper- K Project Jan. 31, Kavli IPMU, Kashiwa 1

2 MoGvaGon Unknowns in ν cross- sec. for Hyper- K/J- PARC Good model of IniGal nuclear state Simple relagvisgc Fermi- Gas model, Spectral funcgon, Existence of mulg- nucleon ν sca[ering (MEC) models: MarGni, Nieves, Charged current 1π producgon Final state interacgons within the nucleus Pions secondary interacgons in the detector Appropriate real data, well- defined control sample, is need to test the above unknowns. 2

3 MoGvaGon Unknowns in ν cross- sec. for Hyper- K/J- PARC Good model of IniGal nuclear state Simple relagvisgc Fermi- Gas model, Spectral funcgon, SF has be[er agreement with electron sca[ering data. 3

4 MoGvaGon Unknowns in ν cross- sec. for Hyper- K/J- PARC Existence of mulg- nucleon ν sca[ering (MEC) models: MarGni, Nieves, Arbitrary Units CCQE Nieves multinucleon ( 5) pionless -decay ( 5) QE E reco - E true (GeV) MEC models enhance the CCQE- like xsec around 1GeV. - > MiniBooNE Ma =

5 MoGvaGon Unknowns in ν cross- sec. for Hyper- K/J- PARC Charged current 1π producgon Reconstructed momentum (1 ring -like) Momentum distribution of ( MiniBooNE CC 1 + ) m?? e until now. is identified as -like ~ Invisible Absorption of is below threshold is identified as -like ~ Invisible is below threshold omentum distribution of 5

6 MoGvaGon Unknowns in ν cross- sec. for Hyper- K/J- PARC Final state interacgons within the nucleus Pions secondary interacgons in the detector Pion cross secgon data on C [mbarn] σ ABS+CX Ashery et al. Navon et al. Our measurements DUET [MeV/c] p π 6

7 MoGvaGon Hyper- K Neutrino target: H 2 O 4π acceptance for charged pargcles Charge ID is difficult Cherenkov thresholds of charged pargcles in H 2 O Muon: 118 MeV Charged pions: 157 MeV Proton: 1GeV 7

8 MoGvaGon Unknowns in ν cross- sec. for Hyper- K/J- PARC Good model of IniGal nuclear state Simple relagvisgc Fermi- Gas model, Spectral funcgon, Existence of mulg- nucleon ν sca[ering (MEC) models: MarGni, Nieves, Charged current 1π producgon Final state interacgons within the nucleus Pions secondary interacgons in the detector Appropriate real data, well- defined control sample, is need to test the above unknowns. 8

9 Our proposal New H 2 O target near detector in UA1 magnet H 2 O target Same ν µ flux as Hyper- K 4π acceptance Lower momentum thre. than Cherenkov det., HK Charge ID is possible Observables Same target nucleus as Hyper- K Same phase space as Hyper- K DifferenGal (Q 2 or (p µ, θ µ )) CC0π data w/ bin correlagons DifferenGal (p π ) CC1π data for non- QE BG esgmagon 9

Our proposal 3D grid- like structure + H 2 O

angular acceptance for charged pargcles Lower

than Cherenkov detector Charge idengficagon is

O(signal):CH(BG) = 79:21 (= 46:54 - > T2K ND280)

10 Our proposal 3D grid- like structure + H 2 O target for HK ND x + grid + y + grid + layers 4π angular acceptance for charged pargcles Lower momentum thre. than Cherenkov detector Charge idengficagon is possible if operate in UA1 magnet H 2 O(signal):CH(BG) = 79:21 (= 46:54 - > T2K ND280) x grid y grid x 2.5cm 2.5cm 5cm 5cm 5cm 5cm 2.5cm 2.5cm Each)cell)is)filled)with) water)or)hydrocarbon. 10

11 Current status 11

12 Water Grid And SCInGllator detector WAGASCI WAter Grid And SCIntillator detector! WAter Grid And SCIntillator detector! Box f or scintillators in target H2O/CH detector WAGASCI ~ Japanese sweets (Wagashi) plastic scintillators in target display( chikuma (3D grid- like ssan s figure) tructure) WAGASCI vent display( chikuma san s figure) νμ νμ The project starts on August, Box for 2! 013. Box for! large acceptance large acceptance Japanese sweets Approved as a test 9experiment, T- 59, at (Wagashi) J- PARC PAC Japanese sweets (Wagashi)

13 Project members 8 insgtutes, 41 collaborators Ins)tute for Nuclear Research of the Russian Academy of Science I. Ayzenberg, A. lzmaylov, I. Karpikov, M. Khabibullin, A. Khotjantsev, Y. Kudenko, S. Martynenko, A. Mefodiev, O. Mineev, T. Ovsjannikova, S. Suvorov, N. Yershov KEK T. Ishida, T. Kobayashi Kyoto University T. Hayashino, A.K. Ichikawa, A. Minamino, K. Nakamura, T. Nakaya, K. Yoshida Laboratoire Leprince- Ringuet, Ecole Polytechnique A. Bonnemaison, R. Cornat, O. Drapier, O. Ferreira, F. Gastaldi, M. Gonin, J. Imber, Th.A. Mueller, B. Quilain Osaka City University K. Kim, Y.Seiya, K. Wakamatsu, K. Yamamoto University of Geneva A. Blondel, E. N. Messomo, M. Rayner University of Tokyo N. Chikuma, F. Hosomi, T. Koga, M. Yokoyama Ins)tute of Cosmic- Ray Research, University of Tokyo Y. Hayato 13

14 Detector configuragon WAGASCI + muon range detectors (MRDs) MRDs are located 50cm away from the WAGASCI detector to idengfy the charged pargcle direcgons from TOF. Front VETO 0.5m H 2 O CH H 2 O CH ν beam 0.5m 0.5m MRDs Side (x 2) Downstream (x 1) Muon%range%detectors 0.5m CH#target H 2 O$target ν Central(detector WAGASCI 14

15 B2 floor of ND hall Site Off- axis angle = 1.6 deg. Beam axis (0 deg.) WAGASCI (1.6 deg.) POT] 21 neutrino flux[/25mev/ x Neutrino flux 8 WAGASCI ND H2O/CH detector neutrino energy[gev] Neutrino energy [GeV] 15

16 MRDs Side MRDs (x 2) tracking layers + steel plates p µ up to ~1 GeV/c Downstream MRD tracking layers + steel plates p µ up to ~ 2 GeV/c magnegzed steel (opgonal) µ charge ID for ang- ν run Downstream MRD Side MRDs WAGASCI 16

17 Goals Basic performance test of 3- D grid- like detector Track recon. efficiency, PID capability, TOF cut for BG Cross sec)on ra)o, H 2 O/CH 4π acceptance 3% accuracy CC- inclusive channel, then, exclusive channels. Absolute cross sec)on on H 2 O (and CH) 4π acceptance 10% accuracy (Flux error is dominant.) Double differengal cross secgons for (T µ, cosθ µ ) CC- inclusive channel, then, exclusive channels. 17

18 MC study 18

19 Event display T. Koga, N. Chikuma (Univ. Tokyo) w/o grid layer CCQE μ ν μ p ν μ μ p hard to track large sca[ering μ 19

20 Event display T. Koga, N. Chikuma (Univ. Tokyo) with grid layer CCQE μ ν μ p ν μ μ p easy to track large sca[ering μ 20

21 Event selecgon for CC- inclusive WAGASCI/MRD matched track, stopped in MRDs Select a long muon track from CC interacgon. TOF (t 1 < t 2 ) cut for charged pargcle BGs WAGASCI fiducial volume cut Muon%range%detectors MRDs µ%track ν t 1 t 2 Fiducial volume VETO%layers Central%detector WAGASCI 21

Performance for CC- inclusive (MC) neutrino run efficiency 0.8 0.6 0.

22 Performance for CC- inclusive (MC) neutrino run efficiency H 2 O - CH μ efficiency sca[ering angle distribugon large acceptance similar efficiencies between targets 0.2 degree T. Koga (Univ. Tokyo) events/10 21 POT/10deg CC- inclusive NC BGs from MRD BGs from wall, floor degree CC NC BG from outside Events/10 21 POT FracGon 90.1% 4.7% 5.2% 100% low BG All 22

23 R&D of detector components 23

3mm- thick scing. for WAGASCI Positron beam test at Tohoku Univ. on Dec., 2014. Scintillator processed by G-tech ScinG.

41 ± 0.09p.e. Efficiency The average for these 7 bins at the edge* 1 : 99.60 ± 0.94% The average for these 9 bins at the edge* 2 : 99.

24 3mm- thick scing. for WAGASCI Positron beam test at Tohoku Univ. on Dec., Scintillator processed by G-tech ScinG.: test Fermi lab 2 nd gen. MPPC (ΔV=4.0V) Light Yield The average for these 7 bins at the edge* 1 : ± 0.11p.e. The average for these 9 bins at the edge* 2 : ± 0.09p.e. Efficiency The average for these 7 bins at the edge* 1 : ± 0.94% The average for these 9 bins at the edge* 2 : ± 0.91% *1 ch # is 4 in vertical, 6~12 in horizontal *2 ch # is 4~12 in vertical, 6 in horizontal 24

MRD scingllator A. Izmaylov (INR) 0.7 20 200 cm 3 Wave Length Shifting fiber Left side MPPC (2 nd gen, 1 1m 2, ΔV=2.6V) Right side MPPC Light yield(p.

25 MRD scingllator A. Izmaylov (INR) cm 3 Wave Length Shifting fiber Left side MPPC (2 nd gen, 1 1m 2, ΔV=2.6V) Right side MPPC Light yield(p.e/mip) Cosmic- ray lew right lew + right distance = 100cm distance(cm) timing(ns) - Light yield > 17 p.e/mip. - DetecGon efficiency > 99.5% (5 p.e. thre.) - Timing resolugon = 1.6 ns. good performance! 25

26 Mechanical design A. Bonnemaison/ O. Ferreira (LLR) Layer Y layer Module(4layers) MPPC X layer Grid layer Mechanical frame Detector(16modules) 1m 30 26

27 WAGASCI Schedule May, 2015: Final mechanical drawing Aug. Nov., 2015: ConstrucGon Side (Downstream) MRDs May, 2015 (Jul., 2015): Final mechanical drawing Dec. Feb., 2016 (Mar. May, 2016): ConstrucGon ND hall Mar. Sep., 2016 Start opera)on Oct.,

28 Possible upgrade Install an upgraded WAGASCI into ND280 magnet. 4π- acceptance water- target near detector WAGASCI Discussion is just gezng started. 28

29 Summary We are developing a new water- target neutrino detector, WAGASCI. WAGASCI was approved by J- PARC PAC as a test experiment. Start operagon on Oct Possible upgrade: WAGASCI into ND280 magnet 29

30 Backup 30

31 MoGvaGon ' An ideal near detector for Hyper- K/J- PARC Momentum thresholds of charged pargcles are lower than Cherenkov thresholds in H 2 O CC1π + events (T2K off- axis = 1.6 deg.) 157 MeV/c π + detecgon efficiency w/ π+ 3D grid- like detector Grid'size'='2.5cm' Grid'size'='5.0'cm 15cm π + momentum (GeV/c) π + range in H 2 O (cm) 31

The status of neutrino experiment WAGASCI

The status of neutrino experiment WAGASCI International Session-Conference of Section of Nuclear Physics of PSD RAS T. Ovsiannikova 1,2, A. Izmaylov 1,3, Yu. Kudenko 1,2 for WAGASCI collaboration 1 Institute