オルソポジトロニウムの 寿命測定による QED の実験的検証
description
Transcript of オルソポジトロニウムの 寿命測定による QED の実験的検証
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QEDA2, 2013
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QED()
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2
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PositroniumElectronpositron
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Positroniump-Ps(singlet)(2)1.2510-10[sec]o-Ps(triplet)3(3)1.3910-7[sec]
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22Na+(SiO2)capture
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22NaNaI
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NaI
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PS
1200nsgate
PsNaI
PSNaIcoincidence
PS840ns delayTDC4
840 - TDC4 = decay time
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4
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ADC calibrationADCADCchanneleventCalibration511keV2
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ADC
0 keV511 keVADC1163 ch1344 chADC2180 ch1371 chADC3155 ch1407 ch
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Energy[keV]= 0.4327(ADC1 - 163)Energy[keV]= 0.4291(ADC2 - 180)Energy[keV]= 0.4881(ADC3 - 155)
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CalibrationkeVevent
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TDC calibrationTDC4calibrationTDC4TDCTDC
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fixed delay TDC
delay [ns]TDC4[ch]11753158623979403797
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Time[ns]= (TDC4 58.37) / 3.984
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Calibrationevent
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TQT
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TQTQt0,y0E
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TQ
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pick-offo-Psp-Psp-Ps.etco-Pspick-off
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pick-off
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Fitting
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pick-offfitting
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fittingfittng
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fitting
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fitting
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pick-off
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(v)TDC
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(nv)TDC
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pick-off491531keV
pick-offPick-off
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TQ
pick-offNaI3TQ
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TQTQ
TQTQTQ
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NaITQTQTQTQ
NaI1NaI2NaI3TQ[ns]9.77.48.2
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TQ
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pick-offpick-offo-Pspick-offf(t)TQf(t)pick-offpick-off
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pick-offNaIpick-offf(t)pick-off
NaI1NaI2NaI3pick-off[ns]11.614.416.7
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pick-offfitting
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fittingfittingfittingROOTfittingfitting
NaI1NaI2NaI3fitting[ns]24.0827.9762.97
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NaI1NaI2NaI3TQ[ns]9.77.48.2pickoff[ns]11.614.416.7fitting[ns]24.0827.9762.97
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NaINaI1020
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pick-offo-PsTQpick-off
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fittingfitting
fittingfittingpick-offfitting
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Fin
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