Nagoya University. Collaborators

Transcription

1 Collaborators Nagoya University Hirohiko M. Shimizu(Nagoya), Katsuya Hirota(Nagoya), Masaaki Kitaguchi(Nagoya), Christpher Craig Haddock(Indiana),William Michael Snow(Indiana), Kenji Mishima(KEK), Tamaki Yoshioka(Kyushu), Takashi Ino(KEK), Satoru Matsumoto(Kyushu) and Tatsushi Shima(Osaka)

2 Outline Introduction - Motivation - Experimental principle Facilities and Devices Data analysis - Method - Experimental data Summary 2

3 Introduction(Motivation) If extra-dimension exists, Gravitational potential is different from Newtonian potential at short range. Nima Arkani-Hamed, Savas Dimopoulos and Gia Dvali Physics Letters B (1998): We search for an unknown interaction by the difference from the well-known potential. 3

4 Introduction(Motivation) Born approximation for Yukawa potential term Nuclear Scattering Isotropic Yukawa Interaction Forward Scattering sin(θ)[barn] dσ/dω 2π Unknown Interaction(α= 21,λ = 1.[nm]) -4 Nuclear Interaction θ [rad] 4

5 Introduction(Inverse square law) Jiro Murata and Saki Tanaka Classical and Quantum Gravity 32.3 (215):

6 Introduction(Inverse square law) 26 Coupling constant α Nesvizhevsky et al. EXCLUDED REGION Kamiya et al. Mohideen et al. Mostepanenko et al. 17 Decca et al Jiro Murata and Saki Tanaka Classical and Quantum [m] Gravity 32.3 (215): 331. Compton length λ 6

7 Introduction (Principle) To search for an unknown force, We measure neutron scattering from noble gases. 7

8 J-PARC/MLF/BL5(NOP) J-PARC/MLF/BL5/Low-Divergence Beam Branch 8

9 J-PARC/MLF/BL5(NOP) J-PARC/MLF/BL5/Low-Divergence Beam Branch 9

10 J-PARC/MLF/BL5(NOP) J-PARC/MLF/BL5/Low-Divergence Beam Branch Count [cps] TOF [msec]

11 J-PARC/MLF/BL5(NOP) J-PARC/MLF/BL5/Low-Divergence Beam Branch Count [cps] TOF [msec] 11

12 Devices Vacuum Chamber 3He PSD 12

13 3He PSD Y [mm] 4 3 3He Direct Beam X [mm] 1 Neutron Count He Detector Pulse Height Count [cps] He Detector Time Of Flight Pulse height TOF [msec] 13

14 Method [msec] Time Of Flight vs X (Xe) [msec] Time Of Flight vs X (Vacuum) [msec] Time Of Flight vs X (Xe-Vacuum) [mm] [mm] [mm].5 14

15 Experimental Data(TOF vs X) [msec] 4 35 Time Of Flight vs X (Xe-Vacuum) Direct Region Fast Neutron [mm] 15.5

16 Method [msec] Time Of Flight vs X (Xe-Vacuum) TOF [ms] TOF vs. X Preliminary Hist_TOFvsX Entries Mean x.8883 Mean y Std Dev x.1891 Std Dev y Integral [mm] x[mm].5 16

17 Experimental Data(X Plot) count X plot Exp. and Sim. Preliminary Experiment Simulation(Nuclear Scattering Only) Not include Gas motion and Absorption x[m] 17

18 Method [msec] Time Of Flight vs X (Xe-Vacuum) TOF [ms] TOF vs. X Preliminary Hist_TOFvsX Entries Mean x.8883 Mean y Std Dev x.1891 Std Dev y Integral [mm] x[mm].5 18

19 dσ/dω(q) (Preliminary) [msec] Xe-Vac Diff. Cross Section dσ/dω[bn/sr] dσσ /dω Xe Preliminary [rad] q[nm ] 19

20 Summary & Outlook It s significant to measure gravity at a short range. We are analyzing the experiment data very carefully now. Next experiment plan 1. Increase gas pressure (kpa -> 3kPa) 2. Make larger beam size (φmm -> Xmm x Y3mm) 3. Increase measurement time (1day -> day) Simulation Upgrade 1. Absorption 2. Gas motion Coupling constant α Nesvizhevsky 9 et al. Kamiya 8 Compton length λ EXCLUDED REGION et al. Mohideen [m] et al. Mostepanenko Decca 7 et al. et al. 2

21 Back Up 21

22 Experimental Data(TOF vs X:He) [msec] 4 35 Time Of Flight vs X (He-Vacuum) He [mm] 22.5

23 Experimental Data(X Plot:He) count He X plot Exp. and Sim. Preliminary Experiment Simulation(Nuclear Scattering Only) Not include Gas motion and Absorption x[m] 23

24 Experimental Data(TOF vs X:He) [msec] Vacuum Time Of Flight vs X (Vacuum) [mm] 24

25 Setup Sketch 25

26 Test dσ/dω(q) 1barn/sr histogram 1barn/sr TOF[msec] dσ/dω[bn/sr] theta[rad] q[nm ] 26

27 Collider Test and Laboratory Test Jiro Murata and Saki Tanaka Classical and Quantum Gravity 32.3 (215):

28 J-PARC 28

29 Detector 3He Position Sensitive Detector 29

30 Detector ch number 15 HistXY Entries e+7 Mean x.545 Mean y 11.6 RMS x.1585 RMS y Integral 2.313e pl/(pl+pr) 3

31 Cell Window 31

32 Van der Waals force λ µm : Van der Waals force is the main background. :Atom electric polarizability Atoms.( H, He, etc.) Neutron 32

33 n-e scattering n-e differential cross section as a function of Energy and Angle 6 sin(θ)[barn] dσ ne /dω 2π E [mev] θ[rad] Backscattering is dominant. n-e scattering too small to detect in MC simulation for our detector region 33

34 n-e 34

35 Xe-Xe Ineraction Preliminary 35

36 Differential Cross Section Preliminary 36

37 Structure factor 37

38 Data acquisition time counting rate [cps] Counting Rate KP ID 6 38