PRESORT OF THE DATA OF THE COLOGNE TEST EXPERIMENT

1. PRESORT OF THE DATA OF THE COLOGNE TEST EXPERIMENT • Quality and integrity of data • Detector numbering and positions • Calibrations and gain stability • Reactions channels identification

2. The experiment

3. What to check • Quality and integrity of data • Sector energies mostly missing • Some segments are in short circuit and other are missing • Detector numbering and positions • Calibrations and gain stability • Reactions channels as expected ?

4. Quality and integrity of data • Silicon detector fires with almost all his sectors and rings every event • The time of a lot of channels is in overflow TDC of silicon detector We can ask for a validation with an autocoincidence After validation the multiplicity of sectors and rings is (1, 1) as expected for the reaction validation

5. Quality and integrity of data TDC of silicon detector TDC of germanium detector real gate validation

6. Quality and integrity of data With gate on sector energy Without gate on sector energy

7. Quality and integrity of data Some segments missing/low statistics 2 segments in short circuit 3 segments in short circuit

8. What to check • Quality and integrity of data • Detector numbering and positions • Ring numbering • Sector numbering • Silicon detector position • Calibrations and gain stability • Reactions channels as expected?

9. Counts on the rings ~ ring solid angle Tape number 19: alpha source Geometry – ring numbering • Inverse numbering of the rings • The distance between the source and the silicon detector is 34 mm (what about the target?)

10. Geometry – sector numbering 49Ti: 1381 keV Depends on the angle of the firing sector 48Ti: 983 keV • The Doppler correction depends also on: • the mass of the scatterer nucleus • the reaction mechanism

11. Geometry – sector numbering Eγ – sector # Eγ – sector # x 0 63 8 56 12.3 ± 0.5 deg 16 Ge detectors y 48 24 FRONT view (from the target) Center of the cluster in the yz plane 40 32

12. Geometry – silicon detector position ring # – sector # ring # – sector # SI DETECTOR IS NOT PERPENDICULAR TO BEAM ANGLE (θ): 4.50 ± 0.02 deg DIRECTION (φ): 100.4 ± 0.1deg (~ direction of sector 19) BEAM IS OFF AXIS DISTANCE: 2.67 ± 0.01 mm DIRECTION: 100.4 ± 0.1deg (~ direction of sector 19) OR θ = 4.5 deg Si det d = 2.7 mm Rint = 16.5 mm Target beam Center of silicon detector Beam position

13. What to check • Quality and integrity of data • Detector numbering and positions • Calibrations and gain stability • DGF stability • Reactions channels as expected?

14. DGF gain stability: rough calibration using 60Co sources fine recalibration using 511 keV peak during run with beam Electronics stability

15. What to check • Quality and integrity of data • Calibrations and gain stability • Detector numbering and positions • Reactions channels as expected? • (d,p) 49Ti • (d,d’) and (d,pn) 48Ti • Other reaction channels ?

16. Channel identification: gamma spectrum Gammas from 49Ti

17. keV Channel identification: (d,p) through direct reaction Q value of (d,p) reaction: 5.92 MeV Excitation energy: 6.2 MeV

18. keV Channel identification: (d,p) through fusion evaporation PACE calculation: proton spectrum in CM Proton with 4.5 MeV in CM 4.5 3.5 PACE Coulomb barrier: 3.95 MeV 5.5 6.5

19. Channel identification: gamma spectrum Gammas from 49Ti and 48Ti

20. Channel identification: (d,d') direct and (d, pn) fusion evaporation Gate on gamma energy 983 keV (d,d’) direct (d,pn) fusion-evaporation (?)

21. Channel identification: other reaction channels ? Gate on gamma energy 983 keV Protons and deuterons can not deposit so much energy Is it noise? Why only at small angles?

22. Channel identification: other reaction channels ? 48Ti 2H

23. Channel identification: other reaction channels ? 12C 16O

24. Channel identification: other reaction channels ? logbook 12C 14N 16O Absorber thickness: 16 µm

25. Channel identification: other reaction channels ?

26. Channel identification: other reaction channels ?

27. Low energy High energy Channel identification: other reaction channels ? ? new target (chamber opened) changed Si-HV and threshold • Time correlation between high and low energy events in si-detector • Concentration of impurities increases with time • High concentration of low energy events in tape 15 and 16 not understood

28. Channel identification: other reaction channels ? Overflow is expected here but there is not!

29. Channel identification: other reaction channels ? Overflow is expected here but there is not! • This region has the right: • deflection angles • gamma spectrum • statistical dependence on time • Doppler correction

30. Channel identification: other reaction channels ? Overflow is expected here but there is not! • This region has the right: • deflection angles • gamma spectrum • statistical dependence on time • Doppler correction This can mean that electronics did not work the way we expected

31. Channel identification: other coulex reactions • This region has the right: • deflection angles • gamma spectrum • statistical dependence on time • Doppler correction This can mean that electronics did not work the way we expected

32. Channel identification: statistics and selection mixed mixed 220k counts

33. Conclusion: what to analyse ? Experiment designed for d(47Ti, 48Ti)p direct reaction Beam was 48Ti No direct reaction on target We still have a nice direct reaction on contaminant(s) ! 12C BUT • Smaller statistics • Use of background 16O

35. Quality and integrity of data

36. Quality and integrity of dataData structure Sector #, Energy, Time Sector #, Energy, Time … Ring #, Energy, Time Ring #, Energy, Time … Germanium #, Energy, Time … Segment #, Trace, Energy …. Silicon detector VME modules Germanium detector DGF modules