Initial Research of np Scattering with Polarized Deuterium Target at ANKE/COSY

B Gou

doi:10.1142/s2010194516600582

Abstract

The quasi-free np charge-exchange reaction [Formula: see text] has to be employed to extend the investigations of np scattering at ANKE to the highest energy available at COSY. As the proof-of-principle experiment, the initial research has been conducted at proton energy [Formula: see text] MeV using a polarized Deuterium target. The vector and tensor analyzing powers [Formula: see text] and [Formula: see text] were measured for momentum transfers [Formula: see text] MeV/c. These data connect smoothly with the previous measurements at [Formula: see text] MeV/c performed using a polarized deuteron beam. The reported data are well reproduced by the impulse approximation using the SAID np amplitudes. The results therefore proves that it is possible to continue the np programme at higher energies at ANKE.

Highlights

Thorough understanding of the nuclear forces is essential to both nuclear and hadronic physics
Due to the lack of free neutron source, the np study is usually performed by using substituents such as D/3He, which provide the quasi-free neutrons
It was pointed out[3] that the free np spin-dependent amplitudes can be deduced from the observables of the charge-exchange deuteron breakup reaction dp → {pp}n by phase-shift analysis (PSA), provided that the final proton pair is in 1S0 state.a The transition

Summary

Introduction

Thorough understanding of the nuclear forces is essential to both nuclear and hadronic physics. This paper is intended to report the latest results of the np study at the ANKE magnetic spectrometer.[1] Due to the lack of free neutron source, the np study is usually performed by using substituents such as D/3He, which provide the quasi-free neutrons It was pointed out[3] that the free np spin-dependent amplitudes can be deduced from the observables of the charge-exchange deuteron breakup reaction dp → {pp}n by phase-shift analysis (PSA), provided that the final proton pair is in 1S0 state.a The transition. This is an Open Access article published by World Scientific Publishing Company. The forward (FD) and positive (PD) sub-detectors are exploit to detect the reaction pd → dπ+n, which can be used for the polarimetry

Targets and Polarimetry

Analyzing Power Measurement for Charge-exchange Reaction