References - Bogoliubov Laboratory of Theoretical Physics - JINR

The amplitudes of the signals and timing
information from the both P and D
detectors were recorded for each event.
The distributions of the amplitudes for
scattered deuterons and recoil protons for
polyethylene target are presented in Fig. 2a
and Fig. 2b, respectively. The correlation
of the amplitudes and time difference are
shown in Fig. 2c and Fig. 2d, respectively.
One can see the clean correlation between
the amplitudes from P and D detectors and
well pronounced peak in time difference
spectrum corresponding to the dp-elastic
scattering events.
The selection of the dp-elastic scattering
events was done by the applying of the
P
D
Figure 1: Schematic view of the experiment. Pproton
detector, D-deuteron detector.
graphical cut on the amplitudes correlation (see Fig. 3a). This cut allows to reduce
significantly background in the time difference spectrum show in Fig. 3b.
N events
ADC, channels
300
200
100
0
100 200 300 400 500 600 700
800
600
400
200
a
ADC, channels
200 300 400 500 600 700
ADC, channels
c
N events
N events
50
0
100 200 300 400 500 600 700 800 900
400
200
b
ADC, channels
400 450 500 550 600 650 700 750
TDC, channels
Figure 2: The results obtained at 2 GeV deuteron beam on polyethylene target for 8 ◦ deuteron scattering
angle in lab: a) deuteron energy losses, b) proton energy losses, c) correlation of proton and deuteron
energy losses, d) time difference between the signals for deuteron and proton detectors.
The measurements on carbon target were also performed to estimate the carbon contribution
from polyethylene target. The corresponding distributions of the amplitudes
for scattered deuterons and recoil protons, the correlation of the amplitudes and time
difference are shown in Fig. 4. One can see that the distribution for recoil proton energy
losses for d + C interaction is much wider than for d + CH2 scattering.
The time difference for P and D detectors for polyethylene and carbon targets after
applying of the graphical cut on the amplitudes correlation are shown in Fig. 5a. The
relative normalization of the spectra was obtained from the ratio of the background events
398
d