STATISTICS FOR PD ELASTIC @49.3 MeV STOPPED DEUTERONS
In this paper the numbers of stopped deuterons in the pd elastic scattering using Hermes­like
detector are reported. This analysis is performed using two Geant files: one called MS which
includes the Multiple Scattering effect, the second is called NO MS without Multiple Scattering
effect. In both cases two tracks events are taken into consideration in the analysis.
Among 5*105 generated events, the number of 2 tracks events is about 155000 in both files (MS and
NO MS). The analysis is performed considering all the events samples separately and just stopped
deuterons tracks are calculated.
The request to have stopped deuterons is based on the selection that the kinetic energy of a deuteron
must be equal to the amount of the deposited energies inside the layers within 1 MeV.
Red line = deuteron 1 means one hit in the 1st layer Blue line = proton 2 means one hit in the 2nd layer
R= Reconstructed 3 means on hit in the 3rd layer
S= Stopped
MS = Multiple Scattering Geant File
NO MS= No Multiple Scattering Geant File
DEUTERONS STOPPED IN 1 LAYER
rst
In this case deuterons tracks stopped into the first layer of the telescopes are considered for different
event configuration. Short track means the track of a particle stopped into the first layer of a
telescope. The total amount of reconstructed deuterons short track is 64726 (MS file) and 64032
(NO MS file) whereas the total amount of stopped deuterons short track is 61530 (MS file) and
61648 (NO MS file). The percentage of reconstructed and stopped short deuterons tracks for each
sample is calculated considering these numbers.
MS
R
7858 (12%)
S
6790 (11%)
NO MS
7370 (12%)
6491 (11%)
12 1
In this case the deuteron (red line) stops into the first layer while the proton (blue line) has one hit
into the first layer and one hit into the second layer.
R
S
MS
NO MS
2035 (3%) 2144 (3%)
1919 (3%) 2045 (3%)
23 1
In this case the deuteron stops into the 1st layer while the proton has no hit on the 1st layer (because
it passes through the empty space between the two modules or because the deposited energy in the
1st layer is lower than 0.6 MeV) and has one hit on the 2nd and one in the 3rd layer.
123
R
S
MS
NO MS
54833 (85%) 54518 (85%)
52821 (86%) 53112 (86%)
1
In this case the deuteron stops into the 1st layer while the proton has one hit per layer.
Red line = deuteron 1 means one hit in the 1st layer Blue line = proton 2 means one hit in the 2nd layer
R= Reconstructed 3 means on hit in the 3rd layer
S= Stopped
MS = Multiple Scattering Geant File
NO MS= No Multiple Scattering Geant File
DEUTERONS STOPPED IN 2 LAYER
nd
In this case deuterons tracks stopped into the 2nd layer of the telescopes are considered. Medium
track means that the track of a particle stopped into the 2nd layer. The total amount of reconstructed
deuterons medium track is 23166 (MS file) and 24152 (NO MS file), while the total amount of
stopped deuterons medium tracks is 20388 (MS file) and 21287 (NO MS file). Once again the
percentage of reconstructed and stopped medium tracks for each sample is calculated considering
these numbers.
R
S
MS
1016 (4%)
559 (3%)
NO MS
1175 (5%)
656 (3%)
1 12
In this case the deuteron (red line) stos into the 2nd layer while the proton has one hit in the 1st layer.
R
S
MS
NO MS
1769 (8%) 1620 (7%)
1107 (5%) 960 (5%)
12 12
In this case the deuteron stops into the 2nd layer while the proton has one hit in the 1st and one hit in
the 2nd layer. R
S
MS
NO MS
525 (2%) 607 (3%)
497 (2%) 571 (2%)
23
12 In this case the deuteron stops into the 2nd layer while the proton has no hit on the 1st layer but has
one hit in the 2nd and one hit on the 3rd layer.
MS
R 19856 (86%)
S
18225 (90%)
123
NO MS 20750 (85%)
19100 (90%)
12
In this case the deuteron stops in the 2nd layer while the proton has one hit per layer.
Red line = deuteron 1 means one hit in the 1st layer Blue line = proton 2 means one hit in the 2nd layer
R= Reconstructed 3 means on hit in the 3rd layer
S= Stopped
MS = Multiple Scattering Geant File
NO MS= No Multiple Scattering Geant File
rd
In this case deuterons tracks stopped into the 3rd layer of the telescopes are considered. Long track
means that the track of a particle stopped into the 3rd layer. The total amount of reconstructed
deuterons long track is 27680 (MS file) and 28248 (NO MS file), while the total amount of
stopped deuterons long tracks is 12026 (MS file) and 12309 (NO MS file). Again the percentage of
reconstructed and stopped long tracks for each sample is calculated considering these numbers.
DEUTERONS STOPPED IN 3 LAYER
1
R
S
MS
NO MS
19(7‰) 32 (1‰)
6 (5‰) 19 (2‰)
23
In this case the deuteron (red line ) has one hit on the 2nd and one hit on the 3rd layer and stops in the
3rd layer whereas the proton (blue line) has one hit on the 1st layer. MS
NO MS
R 80 (3‰) 64 (2‰)
S
22 (2‰) 20 (2‰)
12 23(no hit on 1
rst
layer)
In this case the deuteron has one hit on the 2nd and one hit on the 3rd layer and here it stops, while
the proton has one hit on the 1st and one hit on the 2nd layer. MS
NO MS R 213 (8‰) 227 (8‰)
S 141 (1%) 158 (1%)
23 23 The deuteron has one hit on the 2nd and on the 3rd layer and here it stops, the proton has one hit on
the 2nd and on hit on the 3rd layer. MS
R
S
NO MS
904 (3%) 884 (3%)
273 (2%) 282 (2%)
1 123
The deuteron has one hit per layer and it stops in the 3rd layer while the proton has one hit in the 1st
layer.
R
S
MS
NO MS
1667 (6%) 1744 (6%)
464 (4%) 437 (4%)
12 123 The deuteron stops into the 3rd layer while the proton has one hit on the 1st and one hit on the 2nd
layer. R
S
MS
NO MS 843 (3%) 892 (3%)
410 (3%) 435 (4%)
23 123
(no hit on 1rst layer)
The deuteron stops into the 3rd layer while the proton has one hit on the 2nd and one hit on the 3rd
layer.
123
23 (no hit on 1
R
S
MS
NO MS 330 (1%) 290 (1%)
176 (1%) 166 (1%)
layer)
rst
The deuteron stops into the 3rd layer having one hit on the 2nd and one hit on the 3rd layer while the
proton has one hit per layer.
R
S
MS
23624 (85%)
10554 (88%)
NO MS 24115 (85%)
10792 (88%)
123 123
The deuteron stops into the 3rd layer and the proton has one hit per layer.