Deuteron beam polarimeter at Nuclotron internal target

Ya T Skhomenko ,M Janek,D Enache,V V Fimushkin ,P K Kurilkin ,V P Ladygin ,И Е Внуков ,E V Chernykh ,A N Livanov ,A V Tishevsky ,Yu V Gurchin ,S G Reznikov ,S M Piyadin ,J T Karachuk ,A A Terekhin ,D O Krivenkov ,A V Averyanov ,A S Belov ,A N Khrenov ,A Isupov ,I S Volkov

doi:10.1051/epjconf/201920410002

Ya T Skhomenko , M Janek + Show 19 more

Open Access

https://doi.org/10.1051/epjconf/201920410002

Copy DOI

Abstract

The current deuteron beam polarimetry at the Nuclotron is provided by the Internal Target polarimeter based on the use of the asymmetry in dpelastic scattering at large angles in the cms at 270 MeV. The upgraded deuteron beam polarimeter has been used to obtain the vector and tensor polarizations during 2016/2017 runs for the DSS experimental program. The polarimeter has been also used to tune the polarized ion source parameters for 6 different spin modes. The data analysis has been performed using the developed software based on C++ language and ROOT5 library

Highlights

The study of the spin structure of two-nucleon and three-nucleon short-range correlations by means of measuring the polarization observables in the deuteron induced reactions is the main goal of the DSS project at the Nuclotron [1,2,3]
The polarimeter based on dp-elastic scattering at large angles at 270 MeV [4], where precise data on analyzing powers [6,7,8] exist, has been developed on the Internal Target
The values of the beam polarization for different spin modes have been obtained as weighted averages for 8 scattering angles for dp-elastic scattering in the horizontal plane only

Summary

Introduction

The study of the spin structure of two-nucleon and three-nucleon short-range correlations by means of measuring the polarization observables in the deuteron induced reactions is the main goal of the DSS project at the Nuclotron [1,2,3]. The polarimeter based on dp-elastic scattering at large angles (θcm ≥ 60◦ ) at 270 MeV [4], where precise data on analyzing powers [6,7,8] exist, has been developed on the Internal Target Deuteron beam polarimeter [4] is placed in the Nuclotron ring. The scattered deuterons and recoil protons at 270 MeV were detected in kinematic coincidence over the cms angular range of 65–135◦ at eight different angles, defined by the positions of the proton detectors.

Objectives

Results

Conclusion