PRESORT OF THE DATA OF THE COLOGNE TEST EXPERIMENT
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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
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The experiment
Main characteristics of the setup
BEAM 48Ti 100 MeV
TARGET 48Ti + 2H 220 μg/cm2
Si detector
thickness 300 μm
segmentation 32 rings, 64 sectors
Absorber thickness 16 μm (Al)
AGATA symmetric triple-cluster
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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 ?
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Quality and integrity of data
validation
• Silicon detector fires with almost all his sectors and rings every event
• The time of a lot of channels is in overflow
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
TDC of silicon detector
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Quality and integrity of data
real gate validation
TDC of silicon detectorTDC of germanium detector
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Quality and integrity of data
With gate on sector energy
Without gate on sector energy
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Quality and integrity of data
3 segments in short circuit
2 segments in short circuit
Some segments missing/low statistics
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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?
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Geometry – ring numbering
Counts on the rings ~ ring solid angle
Tape number 19: alpha source
● Inverse numbering of
the rings● The distance between
the source and the silicon
detector is 34 mm
(what about the target?)
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Geometry – sector numbering
)cos(1
1 2
cmlab
EE
Depends on the angle of the firing sector
49Ti: 1381 keV
48Ti: 983 keV
The Doppler correction depends also on:
• the mass of the scatterer nucleus
• the reaction mechanism
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Geometry – sector numbering
x
y
12.3 ± 0.5 deg
08
16
24
3240
48
56
63
FRONT view (from the target)
Center of the cluster in the yz plane
Ge detectors
Eγ – sector # Eγ – sector #
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Geometry – silicon detector position
BEAM IS OFF AXISDISTANCE: 2.67 ± 0.01 mmDIRECTION: 100.4 ± 0.1 deg (~ direction of sector 19)
Center of silicon detector
Beam position
SI DETECTOR IS NOT PERPENDICULAR TO BEAMANGLE (θ): 4.50 ± 0.02 degDIRECTION (φ): 100.4 ± 0.1 deg (~ direction of sector 19)
OR
beam
Si det
Target
Rint = 16.5 mmd = 2.7 mmθ = 4.5 deg
ring # – sector # ring # – sector #
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What to check
● Quality and integrity of data● Detector numbering and positions● Calibrations and gain stability
– DGF stability● Reactions channels as expected?
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Electronics stability
DGF gain stability: ● rough calibration using 60Co sources● fine recalibration using
511 keV peak during run
with beam
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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 ?
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Channel identification: gamma spectrum
Gammas from 49Ti
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Channel identification: (d,p) through direct reaction
Q value of (d,p) reaction: 5.92 MeV
Excitation energy: 6.2 MeV
keV
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keV
Channel identification: (d,p) through fusion evaporation
PACE calculation: proton spectrum in CM
PACE Coulomb barrier: 3.95 MeV
Proton with 4.5 MeV in CM
4.53.5
5.56.5
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Channel identification: gamma spectrum
Gammas from 49Ti and 48Ti
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Channel identification: (d,d') direct and (d, pn) fusion
evaporation
(d,d’) direct (d,pn) fusion-evaporation (?)
Gate on gamma energy 983 keV
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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?
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48Ti
2H
Channel identification: other reaction channels ?
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16O
12C
Channel identification: other reaction channels ?
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12C 14N 16O
Channel identification: other reaction channels ?
Absorber thickness: 16 µm
ABSORBER NUCLEUS
6 µm 48Ti
10 µm 27Al
16 µm 16O
18 µm 14N
21 µm 12C
logbook
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Channel identification: other reaction channels ?
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Channel identification: other reaction channels ?
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Low energy
High energy?
• 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
Channel identification: other reaction channels ?
new target (chamber opened)
changed Si-HV and threshold
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Overflow is expected here but there is not!
Channel identification: other reaction channels ?
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Overflow is expected here but there is not!
This region has the right:• deflection angles• gamma spectrum• statistical dependence on time• Doppler correction
Channel identification: other reaction channels ?
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Overflow is expected here but there is not!
This region has the right:• deflection angles• gamma spectrum• statistical dependence on time• Doppler correction
Channel identification: other reaction channels ?
This can mean that electronics did not work the way we expected
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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
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Channel identification: statistics and selection
mechanism Gamma energy
Energy in silicon detector
counts
(d,p) direct 1381 keV
750k(d,p) fus-evap 1381 keV
(d,d’) direct 983 keV < 30k
(d,pn) fus-evap 983 keV < 15k
(HI, HI’) coulex 983 keV E > 8 MeV 80k
(HI, HI’) coulex 983 keV 2 < E < 8 MeV ~ 100k
(HI, HI’) coulex 983 keV 0.3 < E < 2 MeV 140k
mixed
mixed
220k counts
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Conclusion: what to analyse ?
16O
12C
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) !
BUT
• Smaller statistics• Use of background
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Quality and integrity of data
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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
Germanium detector
VME modules
DGF modules