Outline Kln test simulation Full simulation of the test experiment - - PowerPoint PPT Presentation

Outline – Köln test simulation

Full simulation of the test experiment with the symmetric triple cluster:

• Event generation
• GEANT4 simulation
• Tracking and sort of the data
• Results

Francesco Recchia – Università di Padova

Köln test experiment

Reaction: d(47Ti,48Ti)p Reaction: d(48Ti,49Ti)p

• direct (?)
• fusion evaporation

Aim of the simulation

Evaluate various Doppler correction methods:

• No PSA: Doppler correction

with segment

• One interaction point per

segment

• Full PSA

Estimate the achieved position resolution:

• Comparing Doppler

broadening of peak in simulated and experimental spectra

AGATA SIMULATION

Monte Carlo event simulation Cascade- Event Monte Carlo for the AGATA array and ancillaries detectors AGATA simulation gamma tracking mgt gsort data sort

CASCADE-Event

CASCADE CASCADE-Event parametric cross-sections calculation Monte Carlo event simulation

Cascade - Event

⇒ ⇒ ⇒

Target Nucleus Beam Nucleus Fusion 10-22 sec Compound Formation

p n n α

⇒

10-19 sec Particle Evaporation

γ

10-15 sec γ Emission

⇒

10-9 sec Groundstate

Simplified event generator

CASCADE-Event program

Extract the residual nucleus Particle decay (α,p,n) to reach the extracted residual nucleus Discrete gamma-ray emission Gamma decays to reach the discrete levels GAMMAWARE package MONTE CARLO CASCADE program

• utput

INPUT Formatted input for the AGATA simulation OUTPUT

CASCADE-Event program

Only fusion-evaporation channel WARNINGS: Statistical gammas from highly excited nuclei to known spectra need to be implemented. (see talk by C. Mihai)

Köln test simulation case

• Apparatus with low efficiency
• Analysis is focused on few peaks

Simplified event generator

SRIM calculation

Target thickness Absorber Recoil and proton angular and beta distribution Beam angular distribution and beam spot

AGATA simulation

GEANT4 MONTE CARLO Follows particles and gammas inside the detector From the CASCADE- Event program INPUT Symmetric triple cluster + ancillary silicon detector Formatted for input to mgt program OUTPUT

OUTPUT Gammas/particles matrices and spectra Identification of particles in ancillary detectors Build coincidence matrices of gammas and particles gsort program mgt program INPUT From the AGATA simulation

Data analysis

Smearing gammas interaction energies and position Gamma tracking OUTPUT In gsort format of particles and gammas detected and tracked

Various data analysis types

Doppler correction average kinematic correction detector segment psa + tracking

Various data analysis types

Doppler correction

1381 keV

average kinematic correction

Simplified PSA + max energy Simplified PSA + tracking Full PSA + max energy Full PSA + tracking

Various data analysis types

3.82 Full PSA tracking 3.94 Full PSA max energy 3.92 Simplified PSA tracking 4.13 Simplified PSA max energy 15.5 Segment ~35 Detector FWHM (keV) @1381keV Doppler correction after kinematic recalibration

Estimate the experimental position resolution

position resolution (cm)

Full PSA + tracking + kinematic correction

CONCLUSION

• Simplified PSA and full PSA produce similar

FWHM results

• Through the comparison between the simulation
• f the Köln test experiment and the experimental

data it will be possible to estimate the experimental position resolution GOOD STARTING POINT