References - Bogoliubov Laboratory of Theoretical Physics - JINR

the polarimetry at the energies between 0.88 and 2.0 GeV [1]. These data are necessary
to provide good precision of the beam polarization measurement for DSS project [2] at
the LHEP-JINR.
The experimental data on the deuteron analyzing
powers for large phase space were obtained at 130 MeV
at KVI [3]. Ay, Ayy and Axx analyzing powers in dpbreakup
will be investigated at Internal Target Station
at 200-500 MeV. The predictions for tensor analyzing
power Ayy and differential cross section in the selected dpbreakup
configurations at 400 MeV are shown in Fig.1.
The light shaded band contains the theoretical predictions
based on CD-Bonn, AV18, Nijm I, II and Nijm
93. The darker band represents predictions when these
NN forces are combined with the TM 3NF. The solid
line is for AV18+Urbana IX and the dashed line for CD
Bonn+TM. One can see large sensitivity of these observables
to the model of 3NF.
The details of the experiment on the measurements
of analyzing powers in dp-elastic scattering at Nuclotron
can be found in ref. [4]. The polarization of the deuteron
beam was measured at 270 MeV, where high-precision
Figure 1: The tensor analyzing
power Ayy and differential cross section
in selected breakup configurations
at 400 MeV. The curves are
explained in the text.
data on the analyzing powers from dp-elastic scattering from RIKEN exist [5]. Two
particles from the dp-elastic scattering were clearly distinguished by their time-of-flight
differences from the target and their energy losses in the plastic scintillators. Values on
the vector and tensor polarizations of the deuteron beam were obtained. These values
are in good agreement with the results obtained by low energy polarimeter based on
3 He(d, p(0 ◦ )) 4 He reactions [6].
A 0.8
y Td=880
MeV
0.6
0.4
0.2
-0
-0.2
-0.4
-0.6
0 20 40 60 80 100 120 140 160 180
Θcm,
deg
A 0.8
y Td=880
MeV
0.6
0.4
0.2
-0
-0.2
-0.4
-0.6
0 20 40 60 80 100 120 140 160 180
Θcm,
deg
Axx
1
0.5
0
-0.5
-1
Td=880
MeV
-1.5
0 20 40 60 80 100 120 140 160 180
Θcm,
deg
(a) (b) (c)
Figure 2: (a) Vector Ay and (b) tensor Ayy, (c) Axx analyzing powers for the dp- elastic scattering at
880 MeV. The curves are described in the text.
The true numbers of the dp- elastic events at 880 MeV were obtained by imposing of
the cut on two-dimensional plot of ADC signals from deuterons and protons detectors.
Additionally, the graphical cuts were applied on the time-of-flight difference between
deuterons and protons from the target. The contribution of the carbon dependent on the
scattering angle was subtracted.
The experimental data obtained at 880 MeV are compared with the theoretical predictions
in Fig.2. Solid curves correspond to Faddeev calculation using the CD-Bonn
NN potential. One can see that the Faddeev calculations reproduce the behavior of all
the analyzing powers. Dotted curves correspond to the calculations in optical potential
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