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Opposite Counter NaI to Xe detector at p 0 Beam test

Opposite Counter NaI to Xe detector at p 0 Beam test. Toshiyuki Iwamoto @ MEG video meeting, Jan 20th/21th, 2004. Opposite side to Xe detector. An array of 64 modules of NaI(Tl) (63.5x63.5x406mm 3 ) p - + p -> p 0 + n : p 0 -> gg : ( 55~83MeV)

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Opposite Counter NaI to Xe detector at p 0 Beam test

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  1. Opposite Counter NaIto Xe detector at p0 Beam test Toshiyuki Iwamoto @ MEG videomeeting, Jan 20th/21th, 2004 Video Meeting, Jan 20th/21th, 2004

  2. Opposite side to Xe detector An array of 64 modules of NaI(Tl) (63.5x63.5x406mm3) p- + p -> p0 + n : p0 -> gg : (55~83MeV) used to detect opposite gamma(83MeV) p- + p -> g+ n : (129MeV) used to evaluate neutron sensitivity of Xe detector Video Meeting, Jan 20th/21th, 2004

  3. Calibration • High voltage value for each PMT is adjusted by cosmic ray peak. • Pedestal subtraction & Gain correction were done in the offline analysis. • Energy and Vertex reconstruction are performed by using corrected charge information. Cosmic ray events HV adjust & Gain Correction Video Meeting, Jan 20th/21th, 2004

  4. Energy estimation • Search for the NaI with maximum charge • Charge sum of the surrounding NaIs • Correction factor (37MeV/cosmic peak ) from 129MeV g data Raw Sum　　　Energy estimation NaI with MaxQ Video Meeting, Jan 20th/21th, 2004

  5. Energy resolution Video Meeting, Jan 20th/21th, 2004

  6. Vertex Reconstruction • Search for the NaI with maximum charge • fitting the mean charge with gaussian function using vertical or horizontal 8 NaIs which include NaI with maximum charge 4cm coll. S1*NaI*Xe NaI with MaxQ Video Meeting, Jan 20th/21th, 2004

  7. Vertex Resolution • sx : 2.7cm sy 1.6cm • Need to be confirmed by simulation Video Meeting, Jan 20th/21th, 2004

  8. p- + p -> g+ n data Trigger condition : S1 * NaI4 Gain:5e6, FSH52: 125 E(NaI)>100MeV, Qsum<20000 g n Neutron delay ~ 30ns No bias data for Xe Require S1TDC, RFTDC data Video Meeting, Jan 20th/21th, 2004

  9. Neutron Candidates in Xe Am/Be data Xe 4.4MeV g peak : Qsum~2580 8.9MeV (need to be calibrated ) Video Meeting, Jan 20th/21th, 2004

  10. Event vertex Same cut as previous Qsum spectrum Video Meeting, Jan 20th/21th, 2004

  11. Summary NaI detector successfully operated during p0 beam test. NaI energy resolution is about 7% at 55MeV, vertex resolution is 3cm in X, 2cm in Y direction. Neutron candidates from p- + p -> g+ n : (129MeV) was detected in Xe detector by detecting 129MeV g in NaI. Video Meeting, Jan 20th/21th, 2004

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