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Spherical Uniform Distribution Simulation for Particle Distribution Analysis in GEANT4

This meeting discussed the simulation of particle distribution around a target using spherical uniform distribution in GEANT4. The study focused on the solid angle, peak widths, and resolutions of the events generated. The results highlighted the wider width of the 12ΛB ground state peak and its impact on event numbers and resolutions. The talk concluded with a to-do list for further analysis in HKS and real data comparison with EH2.

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Spherical Uniform Distribution Simulation for Particle Distribution Analysis in GEANT4

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  1. HES HKS meeting 4/8/2010 T.Gogami

  2. Today’s talk • GEANT4 • spherical uniform distribution (HES) • 12ΛB g.s. width • simulation

  3. Particle distribution around target r=1 [cm] 2/24/2010

  4. HESPrimaryGeneratorAction.cc input/sample.in θ, Δθ , φ , Δφ Δθ θ Δθ min max Δa Δa a

  5. check θ= 0.5 ± 0.2 [rad] φ = 0 ± π [rad] θ= 0.3 ± 0.3 [rad] φ = 0 ± π [rad]

  6. check θ= 0.4 ± 0.3 [rad] φ = 0.5 ± π/2 [rad] works well

  7. HES solid angle using new code(spherical uniform distribution) with Collimator : 5 [msr] without Collimator: 7 [msr]

  8. 12ΛB g.s. width is wider than others generated main peak event num. = 1300 = N second peak event num. = N/3 resolution = 500 [keV] background : peak max. = 1 : 4 [MeV] [MeV] [MeV] [MeV]

  9. 12ΛB g.s. width is wider than others • Width(1σ) (FWHM) 497.5 – 559.9 [keV] • mean(1σ) 35.52 – 62.46 [keV] generated iterated num. = 10000 All event num. =700 = N second peak event num. = N/3 second peak pos. = +150 [keV] resolution = 500 [keV] background : peak max. = 1 : 4

  10. まとめ & to do • まとめ • (GEANT4)spherical uniform distribution for HES • HES solid angle ~7 [msr] (without collimator) • 12ΛB g.s. Simulation (+150 [keV] , resolution 500 [keV](FWHM)) Width(1σ) (FWHM) 497.5 – 559.9 [keV] • To do • (GEANT4) • spherical uniform distribution for HKS • solid angle • matrix • Real data • EH2 • …

  11. backup

  12. EPhi vs. ETheta

  13. 12ΛB g.s. width is wider than others generated main peak event num. = 1300 = N second peak event num. = N/2 resolution = 500 [keV] background : peak max. = 1 : 4 [MeV] [MeV] [MeV] [MeV]

  14. 12ΛB g.s. width is wider than others generated main peak event num. = 1300 = N second peak event num. = N resolution = 500 [keV] background : peak max. = 1 : 4 [MeV] [MeV] [MeV] [MeV]

  15. 12ΛB g.s. width is wider than others • Width(1σ) (FWHM) 483.0 – 542.8 [keV] • mean(1σ) 19.81 – 46.31 [keV] generated iterated num. = 10000 All event num. =700 = N second peak event num. = N/3 second peak pos. = +100 [keV] resolution = 500 [keV] background : peak max. = 1 : 4

  16. 12ΛB g.s. width is wider than others • Width(1σ) (FWHM) 317.6 – 583.8 [keV] • mean(1σ) 50.8 – 78.4 [keV] generated iterated num. = 10000 All event num. =700 = N second peak event num. = N/3 second peak pos. = +200 [keV] resolution = 500 [keV] background : peak max. = 1 : 4

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