References - Bogoliubov Laboratory of Theoretical Physics - JINR

error bars include both statistical and systematical uncertainties. The weighted average
values of the tensor polarizations obtained at 270 MeV are 0.605±0.025 and -0.575±0.02
for the spin modes ”2-6” and ”3-5”, respectively. They are in a good agreement with
the values obtained by the low energy polarimeter based on 3 He(d, p(0 ◦ )) 4 He reaction
at 10 MeV which were 0.69±0.13 and -0.67±0.16 for the spin modes ”2-6” and ”3-5”,
respectively[6]. The value of the angle between the beam direction and polarization axis
was found β = −91.0 ± 1.3 ◦ , therefore, the polarization axis is perpendicular to the plane
containing the mean beam orbit in the accelerator.
The d − p elastic events have been selected
using the information on the energy
losses in the plastic scintillators by protons
and deuterons, their time-of-flight difference
and interaction point position. The values
of the analyzing powers Ay and Ayy at 880
and 2000 MeV were obtained from the following
expressions
Ay =
3(L − R)
2py
L + R − 2
Ayy =
0.5
0
-0.5
0.5
0
-0.5
pyy
0.0 0.2 0.4 0.6 0.8 0.0 0.2 0.4 0.6 0.8 1.0
(1)
(2)
Figure 2: The vector py and tensor pyy polarizations
of the deuteron beam for ”2-6” and ”3-5”
spin modes of POLARIS obtained at different angles.
The error bars include both statistical and
systematical uncertainties.
0.5
0
-0.5
0.5
0
-0.5
0.0 0.2 0.4 0.6 0.8 0.0 0.2 0.4 0.6 0.8 1.0
(a) (b)
Figure 3: (a) The dependence of the vector Ay analyzing power in dp- elastic scattering at the fixed
angles in the c.m.s. as a function of transverse momentum pT .
(b) The dependence of the tensor Ayy analyzing power in dp-elastic scattering at the fixed angles in the
c.m.s. as a function of transverse momentum pT . The open and solid symbols represent data obtained
at RIKEN, Saclay, ANL and at Nuclotron(Dubna), respectively.
Here L and R are the normalized yields of the selected events to the yield for unpolarized
beam for scattering left and right, respectively.
The results on the vector Ay and tensor Ayy analyzing powers at the fixed angles in
c.m.s are plotted as the functions of transverse momentum pT in Fig.3a and in Fig.3b,
413