Daniel Bloor & The AGATA Collaboration IoP NPPD Conference, University of Glasgow, 05/04/11. Development of a simulation package for fragmentation reactions.

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Presentation transcript:

Daniel Bloor & The AGATA Collaboration IoP NPPD Conference, University of Glasgow, 05/04/11. Development of a simulation package for fragmentation reactions at GSI

Motivation S1 S2 S3 S4 Simulate secondary fragmentation and relativistic Coulex GSI to test response of AGATA in high background, relativistic environment.  Spectral reconstruction.  Tracking (OFT, MGT). Simulate PRESPEC GSI (May 2011) Production Target 9 Be (400mg/cm 2 ) Secondary Target 197 Au (386mg/cm 2 ) → 29 S [Coulex] Magnets + Ion optics 36 Ar Primary Beam → RISING + LYCCA-0

Motivation S1 S2 S3 S4 Simulate secondary fragmentation and relativistic Coulex GSI to test response of AGATA in high background, relativistic environment  Spectral reconstruction.  Tracking (OFT, MGT). Simulate PRESPEC GSI (May 2011)  Replace RISING with AGATA + quantify improvements of using highly segmented Ge detectors. Production Target 9 Be (400mg/cm 2 ) Secondary Target 197 Au (386mg/cm 2 ) → 29 S [Coulex] Magnets + Ion optics 36 Ar Primary Beam → AGATA + LYCCA-0

Simulation Process AGATA code Process Events (ROOT script) ROOT tree Analysis/Cuts Tracking (AGATA) ASCII Files

Test Case Events file from Mike Taylor’s lyccasim package [1] containing 91 fragments.  Two-step fragmentation reaction: 58 Ni (600MeV/u) + 9 Be (4000mg/cm 2 ) → 55 Ni 55 Ni + 9 Be (700mg/cm 2 ) → 53 Ni. Figure 1. VRML image showing one fragmentation event (RISING+LYCCA-0). [1] M. Taylor et al., Nucl. Instr. Meth. A606, 589 (2009).

LYCCA-0 Spectra Figure 2. [Top left + right] Beam profile in both the Si detectors. [Bottom left] (E,dE) plot. [Bottom right] (E,TOF) plot (TOF start signal taken from S2 focal plane).

RISING γ -spectrum Figure 3. Uncorrected γ- spectrum showing ‘sum of all crystals’ for 54 Co.

RISING γ -spectra Figure 4. Corrected & uncorrected γ- spectra showing ‘sum of all crystals’ for 54 Co. θ = angle between fragment & centre-axis of crystal that fired first. β ~ 0.4.

RISING γ -spectra Figure 5. Corrected & uncorrected nFold γ -spectra. Add-back method used and Doppler correction applied to crystal containing highest E. 1 Fold2 Fold 3 Fold4 Fold

GSI Figure 6. AGATA S2 configuration (5 triples + 5 doubles) + LYCCA-0.

AGATA γ -spectra θ = angle between fragment and first interaction point (assuming 100% tracking efficiency!) β ~ 0.4 Figure 7. Uncorrected & corrected ‘sum of all crystals’ γ -spectra for 54 Co.

Summary Simulation package to simulate secondary fragmentation and relativistic Coulex reactions from an AGATA perspective  Calculate recoil velocity and direction from LYCCA-0 interactions.  Test performance of Doppler correction/spectral reconstruction + tracking. To do: Fine tune package & simulate up and coming PRESPEC experiment (Coulex of 29 S).

Thanks M. Bentley, R. Wadsworth, P. Joshi University of York Mike Taylor University of Manchester Cesar Domingo + AGATA Simulation Group, Helmut Weick GSI, Darmstadt Enrico Farnea, Dino Bazzacco et al. Legnaro National Laboratory O. Stezowski et al. IN2P3-IPN Lyon Araceli Lopez-Martens + Tracking Team University of Jyväskylä And the whole AGATA collaboration: Univ. Ankara, Turkey Univ. Bonn, Germany NIPNE Bucharest, Romania Univ. Brighton, UK GANIL, Caen, France Univ. Camerino, Italy NBI Copenhagen, Danmark Univ. Cracow, Poland STFC Daresbury, UK GSI Darmstadt, Germany TU Darmstadt, Germany INFN Firenze, Italy INFN Genova, Italy Univ. Göteborg, Sweden FZ Jülich, Germany Univ. Jyväskylä, Finland Univ. Keele, UK Univ. Köln, Germany IFJ PAN Krakow, Poland INFN Legnaro, Italy Univ. Liverpool, UK Univ. Istanbul, Turkey IPN Lyon, France Univ. Lund, Sweden Univ. Manchester, UK INFN/Univ. Milano, Italy LMU München, Germany TU München, Germany INFN Napoli, Italy CSNSM Orsay, France IPN Orsay, France INFN/Univ. Padova, Italy Univ. Paisley, UK INFN Perugia, Italy CEA Saclay, France, Dapnia Univ. Sofia, Bulgaria KTH Stockholm, Sweden iPHC Strasbourg, France Univ. Surrey, UK IPJ Swierk, Poland Univ. Warsaw, Poland Univ. Uppsala, Sweden Univ. York, UK