New data on the differential cross-section on dp-elastic scattering at 880 MeV obtained at Nuclotron

The results on the cross-section of dp-elastic scattering reaction obtained at 880 MeV at internal target of Nuclotron are presented. The measurements have been performed using CH2 and C targets and kinematic coincidence of signals from scintillation counters. The cross-section data are compared with theoretical predictions and results of previous experiments.

The goal of present investigation is to measure the cross-section of d p-elastic scattering at the energy 880 MeV using the kinematic coincidences of deuteron and proton with plastic scintillation counters.Measurements were performed using polyethylene and carbon targets and procedure of CH 2 -C time difference spectra subtraction [10,11].The data are compaired with the calculation of relativistic multiple scattering model [12].

Experiment at internal target station at Nuclotron.
The experimental setup for d p-elastic scattering study at Internal Target Station (ITS) consists of 4 detectors (P, D ,PP-L ,PP-R), located at the horisontal plane.The signals from the P and D detectors give proton and deuteron coincidences for d p-elastic and quasi-elastic reactions, PP-L and PP-R register protons from pp-quasi-elastic reaction.This reaction is used as the relative intensity monitor of the interacting beam with the target for calculation of cross-section of d p-elastic scattering reaction.This monitor can be used also for polarization measurements, because PP-detectors are located at 90 o in c.m.s. and non-sensitive to the beam polarization.

Data analysis.
The typical amplitude and timing spectra obtained at the 880 MeV and polyethylene target are presented in Fig. 1.The measurements on carbon target were also performed to estimate the carbon a e-mail: gurchin@jinr.ru[10,11] for 880 MeV is presented in Fig. 2. The relative normalisation of the dp-elastic scattering data was performed using pp-quasielastic scattering data.
4 Results of the cross-section measurement.
Angular dependences of the d p-elastic scattering cross-section obtained at 880 MeV are presented by the solid symbols in Fig. 3.The experimental data obtained at Nuclotron are normalised to the theoretical calculation performed within relativistic multiple scattering model [12] at the 60 o c.m.c.given by the solid curve.These calculations take into account the single scattering one-nucleon exchange and double scattering terms.The dashed curves are obtained by the consideration of only single scattering and the nucleon exchange.The shape of the angular dependence of the relatively normalised data obtained data at Nuclotron agree with the behaviour of the previously obtained data [13,14].

Conclusion.
The results of the cross-section measurement using CH Open circles and triangles are the data taken from [14,13], respectively.The solid and dashed curves are the results of the calculations vithin relativistic multyple scattering [12] with and without considering of the double scattering term, respectively.
The work has been supported in part by the RFBR grant N o 10-02-00087a.

EPJFig. 1 .Fig. 2 .
Fig. 1.Data obtained with polyethylene target at 880 MeV: distributions of the amplitudes for scattered deuterons (a) and recoil protons (b).The correlation of the amplitudes (c) time difference between signals for proton and deuteron detectors (d).

Fig. 3 .
Fig.3.The differential cross-section of d p-elastic scattering reaction at the deuteron energy of 880 MeV obtained at Nuclotron is show by solid circles.Open circles and triangles are the data taken from[14,13], respectively.The solid and dashed curves are the results of the calculations vithin relativistic multyple scattering[12] with and without considering of the double scattering term, respectively.