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1、Muon Flux Measurements and Simulation at CJPLZhi ZENG CDEX Collaboration Symposium of the Sino-German GDT Cooperation Tbingen,Apr.2013ContentsIntroductionMuon Flux MeasurementMuon Flux SimulationMuon Background in CJPLSummary2023-3-51.IntrodutionMuon Flux Measurements and Simulation at CJPL2023-3-5第
2、3页The position of the Jinping tunnel2023-3-5第4页Profile of Jinping Tunnel2023-3-5第5页Elevation/mTunnel length/mCJPL TunnelCJPL TunnelJinping MountainElevation/mYalong River（East）Yalong River（west）CJPL Site2023-3-5第6页Traffic Tunnel ATraffic Tunnel BCJPL EntranceMain HallTotal VolumeMuon Background in D
3、M Exp.Muon penetration;Neutrons produced by muon interactions;Gammas produced by muon interactions;Muon capture reactions(not important).2023-3-5第7页2.MUON FLUX MEASUREMENTMuon Flux Measurements and Simulation at CJPL2023-3-5第8页Detector&Electronic system2023-3-5第9页 A telescope system consisting of 2
4、groups,both of them is composed of 3 plastic scintillation detectors.The signal from PMT is fanned into 2 channels:One fed into a 100MHz bandwidth FADC module,the other sent to logic OR modules after discriminated and stretched.A signal generator as a random trigger for dead time study also contribu
5、te system trigger gate.FADC converts the whole analog pulses to digital signals,which written into storage for offline analysis by DAQ program.20 cm1.0m0.5m0.05mMuon event selected:Pulse Shape Discrimination(PSD)2023-3-5第10页 Muon energy deposit=10MeV in 5cm thickness detector,while gamma deposit ene
6、rgy 99.9%Using signal generator,serving as random trigger,produces periodic pulses which are independent of physics events.Dead time correction factor:Defined as the ratio of recorded number to generated number of random trigger events;Dead time correction factor:measured,higher than 99.9%.2023-3-5第
7、14页Muon Flux measurement correction(2)Edge effect correction:93.4%Edge effect:Muon would pass the edge of the top or bottom scintillators but penetrate the whole thickness of the middle one.in thes cases,these events would not pass pulse amplitude threshold selected.using Monte Carlo method to calcu
8、late the correction factor,it is 93.4%.edge effect illustration Muon Flux measurement correction 2023-3-5第15页(3)detection efficiency correction(4)solid angle correctionmuon Flux:number of triple-coincident events2023-3-5第16页Muon Flux Measurement in CJPL Nov.2010 to Dec.2011,231 days measurement,28 e
9、vents from two groups are pass all the constrain.After correction,get Muon flux in CJPL*:(2.0 0.4)10-10cm-2s-1*the solid angle correction in CJPL is set to 1.0 for the angle distribution underground is unkown.2023-3-5第17页2023-3-5第18页3.MUON FLUX SIMULATIONMuon Flux Measurements and Simulation at CJPL
10、2023-3-5第19页 Incident Muon Energy Spectrum Assumption：muon energy spectrum on the top of Jinping mountain(4000 m)like that at sea level2023-3-5第20页Fig.1 Muon momentum spectrum distribution of two different angles at sea level 2 dImdEmdcosq0.14Em-g+1()(11+aEmcosq+0.0541+bEmcosq)Gaisser Equation:Em a=
11、1.1/115GeV:Muon energy on sea level(GeV)b=1.1/850GeVComputational Model and program Assumption:CJPL lies in a hemisphere MUSIC:muon transportation.2023-3-5第21页Fig.2 Schematic of the mountain and CJPLs location E0min=t exminx-1t=500GeVx 2.5105g/cm2Muon energy threshold:Muon energy 860GeV104GeV,integr
12、al muon flux in the ground is about 4.8410-8 cm-2s-1.Simulation results by MUSIC Average energy of residual muon:370GeV Muon survival probability:7.6510-3 Muon flux in CJPL with：3.1710-10cm-2s-1(simulation)2.010-10 cm-2s-1(measurement）2023-3-5第22页Fig.3 Simulation results of residual muon flux2023-3-
13、5第23页Google Earth map for the elevation of Jinping Mount.voxeled JInping Mount in GEANT Google Elevation APIpixel:201*301CJPLCJPL average rock overburden/mexact simulation is processing!polar angle/deg.4.MUON BACKGROUND IN CJPLMuon Flux Measurements and Simulation at CJPL2023-3-5第24页Neutron by Muon
14、with FLUKA 2023-3-5第25页Incident MuonsRockAirConcreteSchematic of computational model for secondary particles caused by muon Neutron 20MeVneutron 20MeV:0.1321-1.0MeV）3Kamiokande,Japan10003.010-3 3（8.250.58）10-2（thermol）3（11.51.2）10-2（non-thermol）3SNO,CA20003.010-6 34.710-2（thermol）34.610-2（fast）3Soud
15、an,US7002.010-3 3-DUSEL,US14784.410-5 6-CJPL,China24003.1710-6（simulation）2.010-6（measurement）8.3710-7（simulation）第29页2023-3-52010中国锦屏地下实验室建设 及暗物质实验工作总结汇报会Thanks！References1 Heusser,G.,Low radioactivity background techniques,1995,Annual Reviews Inc:Palo Alto,CA,USA.p.543-543.2Allkofer O C.Introducti
16、on to Cosmic Radiation,1987,Science Press:Beijing.p.155-159.3A Bettini.Underground laboratoriesJ.Nuclear Instruments and Methods in Physics Research A.2011,626-627:S64S68.4M J Carson,J C Davies,E Daw,et al.Neutron background in large-scale xenon detectors for dark matter searchesJ.Astroparticle Phys
17、ics.2004,21:667-687.5J.M Carmona,S Cebrin,E Garca,et al.Neutron background at the Canfranc underground laboratory and its contribution to the IGEX-DM dark matter experimentJ.Astroparticle Physics.2004,21:523-533.6 F E Gray,C Ruybal,J Totushek,et al.Cosmic ray muon flux at the Sanford Underground Laboratory at HomestakeJ.Nuclear Instruments and Methods in Physics Research A.2011,638:63-66.2023-3-5第30页
中国锦屏地下试验室建设工程汇报-Indico
