Results of Measurements of the Analyzing Powers for Polarized Neutrons on C, CH2 and Cu Targets for Momenta Between 3 and 4.2 GeV/c

I.m Sitnik ,P Rukoyatkin ,E Tomasi‐Gustafsson ,K S Legostaeva ,R A Montgomery ,В В Глаголев ,R A Shindin ,A V Shutov ,G Martinská ,D Marchand ,C F Perdrisat ,Y Wang ,I V Slepnev ,S Basilev ,I A Philippov ,V Punjabi ,V M Slepnev ,J Urbán ,Н М Пискунов ,A D Kovalenko ,Д А Кириллов ,O Gavrishchuk ,K Hamilton ,Yu P Bushuev ,J R M Annand ,A N Livanov ,A V Shipunov ,A V Terletskiy ,A Povtoreiko ,N V Kostayeva ,J Mušinský

doi:10.1088/1742-6596/1435/1/012048

Abstract

The analyzing powers for neutron charge exchange nA → pX reactions on nuclei have been measured on C, CH2 and Cu targets at incident neutron momenta 3.0 - 4.2 GeV/c by detecting one charged particle in forward direction. The polarized neutron measurements are the first of their kind. The experiment was performed using the Nuclotron accelerator in JINR Dubna, where polarized neutrons and protons were obtained from breakup of a polarized deuteron beam which has a maximum momentum of 13 GeV/c. The polarimeter ALPOM2 was used to obtain the analyzing power dependence on the transverse momentum of the final-state nucleon. These data have been used to estimate the figure of merit of a proposed experiment at Jefferson Laboratory to measure the recoiling neutron polarization in the quasi-elastic 2H(e, e′n) reaction, which yields information on the charge and magnetic elastic form factors of the neutron.

Highlights

The proposal E12-07-109 [1] to measure the p/n polarization from the reaction 2H(⃗e, e′p/n) up to momentum of p/n equal 8 GeV/c needs to have analyzing power Ay in dependence on solid scattering angle or its derivatives
The analyzing powers for neutron charge exchange nA → pX reactions on nuclei have been measured on C, CH2 and Cu targets at incident neutron momenta 3.0 - 4.2 GeV/c by detecting one charged particle in forward direction
The experiment was performed using the Nuclotron accelerator in JINR Dubna, where polarized neutrons and protons were obtained from breakup of a polarized deuteron beam which has a maximum momentum of 13 GeV/c

Summary

Introduction

The proposal E12-07-109 [1] to measure the p/n polarization from the reaction 2H(⃗e, e′p/n) up to momentum of p/n equal 8 GeV/c needs to have analyzing power Ay in dependence on solid scattering angle or its derivatives. The analyzing powers for neutron charge exchange nA → pX reactions on nuclei have been measured on C, CH2 and Cu targets at incident neutron momenta 3.0 - 4.2 GeV/c by detecting one charged particle in forward direction. The polarized neutron measurements are the first of their kind.

Results

Conclusion