j-parc での yn 相互作用の研究
DESCRIPTION
J-PARC での YN 相互作用の研究. 東北大学理学研究科 三輪浩司. Contents. Physics background YN interaction Scattering experiment , spectroscopy Past experiments of YN scattering What did we learn?. What should we improve? Experiment at J-PARC LH 2 , Fast IIT, Scifi-MPPC R&D of Scifi-MPPC - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/1.jpg)
J-PARCでの YN相互作用の研究東北大学理学研究科
三輪浩司
![Page 2: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/2.jpg)
Contents Physics background
YN interaction Scattering experiment , spectroscopy
Past experiments of YN scattering What did we learn?. What should we improve?
Experiment at J-PARC LH2, Fast IIT, Scifi-MPPC
R&D of Scifi-MPPC Performance for MIP, proton
e+ beam test @ LNS proton beam test @ CYRIC
Outlook Trigger, Multi-channel readout
![Page 3: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/3.jpg)
Nuclear force
regV
rmc
What is the origin?Color magnetic interaction
ij
jijiji
s ssFFmm
AHH ))((0 meson exchange picture
NN interaction
interaction Isospin 3/2Spin 1
Quark Pauli effectStrong repulsive force
More exchange mesons• K• K*,
To SU(3) flavor symmetry
![Page 4: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/4.jpg)
Baryon-Baryon interaction
NN interaction special aspect of BB i
nteraction BB interaction
Effect of new quark Different aspect of u,
d quarks N
exchange is forbidden.
N (S,T)=(1,3/2) quark Pauli effect
S=0 NN(T=1) S=-1 N(T=3/2) N-N(T=1/2) S=-2 (T=2) N--(T=1) N--(T=0)S=-3 (T=3/2) - (T=1/2)S=-4 (T=1) S=0 NN(T=0)S=-1 N-N(T=1/2)S=-2 N-(T=1)S=-3 (T=3/2)
S=-1 N(T=3/2)S=-2 N--(T=1)S=-3 - (T=1/2)S=-4 (T=0) S=-1 N-N(T=1/2) S=-2 N-(T=1) N--(T=0)S=-3 - (T=1/2)
S=-1 N-N(T=1/2) S=-2 N-(T=1) N(T=0)S=-3 - (T=1/2)
S=-2 N--(T=0)
![Page 5: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/5.jpg)
Experimental investigation of YN interaction
2body interaction pp, np scattering deuteron
Tensor force
Spin dependent force Structure of Nuclei
Large LS force Polarized pp, np scatter
ing
2body interaction Bubble chamber Poor data
SU(3) framework Spin dependent force
Structure of Hypernulei
1950
NN interaction
YN interaction
npnp pppp pp p0p
p+p pp p0n pn
At J-PARC!70
90×
![Page 6: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/6.jpg)
YN scattering observables
Precise measurement Model selection
Meson exchange model Quark model
RGM-F
NSC
HC-DHC-F p scattering
![Page 7: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/7.jpg)
N(N)=N(beam)/10000 More Hyperon beam
More fast imaging
YN scattering experiment at KEK
![Page 8: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/8.jpg)
Important parameter Production of
1cm Scifi (CH) (from free proton) 1M/spill beam KURAMA spectrometer acceptance
(, ) 1.8mb 9 / spill (, ) 0.5mb 2 / spill
Scattering of
Mean flight legth ~ 1.3cm (p) ~ 10mb (assumption) 1600 1 p scattering
![Page 9: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/9.jpg)
Production target 2cm CH2 + 2cm CH
Free proton 54
Quasi free 118
Important parameter2
(, )
(, )
1M/spill 10M/spill
5M/spill 50M/spill 500M/spill 5000M/spill
172/spill 1720/spill 17200/spill 172000/spill
p scat 0.1/spill 1/spill 10/spill 100/spill
We need Fast Imaging deviceWe need high quality trigger
@ 1M K
![Page 10: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/10.jpg)
R&D works for fast imaging Ieiri
High-Speed Image Delay Tube Image duration
Electron drift
J.K. Ahn LH2 target (No Imaging)
Detect all state particle with spectrometer Miwa
Scifi-MPPC readout Fast imaging + spectrometer
![Page 11: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/11.jpg)
Read out system of SCIFI using MPPC’s Multi-Pixel Photon Counter (MPPC)
New Si photo-diode consisted of multipixel of Avalanche Photo Diode (APD) operating in Geiger Mode
100 ~ 1600 pixels of APD in MPPC Output signal is the sum of each pixel
Characteristics Fast time response ( < 10ns)
It can operate in the high beam intensity
Large gain (105106) Possible to detect 1 photon
Operation at the magnetic field IIT can not work at the magnetic field
Can we use this detector for hyperon scattering experiment using a high intensity beam ?
1mm
1mm
![Page 12: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/12.jpg)
At J-PARC 1st target is p scattering production via (, ) reaction using a 1.1GeV/c K-
beam Forward spectrometer+ Cylindrical spectrometer
Concept of whole experimental setup
Zoom up
![Page 13: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/13.jpg)
To be studied
MIP Light yield Enough
efficiency
Slow proton Dynamic range Range analysis Total energy
deposit
p
p
![Page 14: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/14.jpg)
Performance check for MIP
LNS-Tohoku, test beam lineWith 450MeV Positron beam
2007/Jan20ch MPPC readout
![Page 15: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/15.jpg)
Performance for MIP particle Prototype of Scifi-MPPC
system Readout of 20ch MPPC e+ beam
1mmx1mm Fiber 20 ch
Scinti. Fiber
MPPC
Connection between Fiber and MPPC
MPPC
Fiber
![Page 16: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/16.jpg)
Photon number for MIP Identification of beam
Required hits of upstream and downstream fibers
Required these hits two photon
Check the photon number
![Page 17: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/17.jpg)
Performance for proton
Tohoku Univ. CYRIC80MeV proton beam
2008/June50ch readout
![Page 18: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/18.jpg)
Purpose of this experiment Response of Scifi-MPPC system for proton
Light yield Momentum resolution from Range Radiation hardness
Momentum range of proton in YN scattering exp.
Total 0~1.2GeV/c Stop in Scifi 0~0.4GeV/c This momentum range is accessible in CYRIC (80MeV proton)
![Page 19: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/19.jpg)
Experimental setup Primary Proton beam
Ekin = 77.52 MeV 1~5nA
Secondary proton beam pp scattering (11~42MeV)
Primary target CH2
30, 100, 300 m Fiber bundle
5segment x 10 layer 1mmx1mm
Vacuum chamber 10-3 Pa
77.52MeV p
pp’
Trigger counter12cm from targetEntrance 3mm
Fiber 5segment x 10layer20cm from target
![Page 20: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/20.jpg)
Data List
(deg) trigger
’(deg) fiber
Ekin(MeV)
Range (mm)
23 67 11.3 1
27 63 14.3 2
30.5 58.5 18.8 4
35.5 55 23 5
38 52 27.4 7.3
39.5 49.5 30.0 8
45 45 34.7 11
50 40 42.1 16
CH2 targetp
p
Scifi
Trigger counter
p beam 77MeV
Angle scan
pp scattering
Momentum selected proton beam to Scifi
![Page 21: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/21.jpg)
Signal of proton Raw signal
Proton ~250mV 1p.e. ~4mV
Dynamic range (400pixel) 1p.e. (1pixel) ~ 10ch 34MeV proton ~ 120pixel Stopping proton ~ 300pixel
Trigger selection Proton OK Stopping proton OK
MIP
regi
on
Proton stop
Proton pass through
~250mV
(single photon ~ 4mV)
40ns
![Page 22: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/22.jpg)
Stop layer and Total energy depositStop layer Total energy
![Page 23: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/23.jpg)
Trigger possibility Identify of scattering proton
Total Energy deposit 1 scattering / 100 cut events ( >22MeV)
Number of particle + each energy deposit
p
Detect 3 particles with counter
2 particles Counter1 stopping particle Energy deposit
![Page 24: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/24.jpg)
Multi-channel readout Total channel of MPPC
~5000 ch We have to serialize the readout (like SSD). Serializing chip Flash ADC
Requirement of serialize Fast time response
10MHz Trigger generation
Chip VA chip? (slow?) APV25 (50ns peaking time)
![Page 25: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/25.jpg)
Summary We want to reveal new aspects of B.B. interaction
N, N, N We need high intensity beam
~10MHz, ~ 100MHz We have to develop high speed imaging device
Fast image delay tube MPPC readout
MPPC readout MIP
mean photon number ~6 photon Proton
Dynamic range is enough. Works well as range counter. Stopping proton can be triggered easily.
Further works Trigger possibility Multi-channel read out
![Page 26: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/26.jpg)
Typical image (Ekin=30MeV)
![Page 27: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/27.jpg)
YN scattering experiment at KEK Scintillation fiber and IIT-
CCD KEK-PS E289, E452 p, p, p elastic scattering Feasibility of SCIFI active
target
reaction Event number
E289p 31p 30p ----
E452 p 113
ProblemIIT-CCD is slowThere are overlaps of image @ beam intensity > 300kHzDetection of all particles in the final state is difficult
![Page 28: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/28.jpg)
Experimental investigation of YN interaction Hyperon-Nucleon Scattering
Difficult due to short lifetime of hyperon Poor data compared to NN scattering
Structure of hypernuclei High resolution magnetic spectrometer Gamma-ray spectroscopy using Ge detector
Problem Derive two body force from complex many body sy
stem N interaction, N interaction ?
npnp pppp pp p0p
p+p pp p0n pn
![Page 29: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/29.jpg)
大きさについて
![Page 30: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/30.jpg)
Advantage of detecting all particles in the final state
Remove the quasi free scattering SCIFI consists of CH Quasi-free scattering with proton in carbon nuclei should
be separated from the scattering with free proton.
Scattered p + from
n from
p
Scat’ : Momentum Scat’ angle
Proton: Mom, AnglePrediction
Proton: Mom, AngleMeasurement
MeasurementConsistency checkRemove quasi free
Momentumproton(GeV/c) (degree)
Free proton
Quasi free scattering
![Page 31: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/31.jpg)
Photon number for MIP
Mean photon number ~6 photon Efficiency ( > 2 photon) ~ 95%
Mean photon number
> 1photon> 2photon
![Page 32: J-PARC での YN 相互作用の研究](https://reader036.vdocuments.site/reader036/viewer/2022062305/56815a8b550346895dc800a6/html5/thumbnails/32.jpg)
Operation in Magnetic Field
Photon number with magnetic field Photon number Gain
e+ beam
Magnet
FiberB Field
Do NOT change due to the magnetic field
We can use this Scifi-MPPC system as an imaging detectorinside the magnetic spectrometer