Neutron-proton charge-exchange amplitudes at 585 MeV

TL;DR

This paper reports measurements of neutron-proton charge-exchange amplitudes at 585 MeV using the dp -> {pp}n reaction, demonstrating the effectiveness of the impulse approximation and suggesting potential for higher-energy studies.

Contribution

It provides new experimental data on charge-exchange amplitudes at 585 MeV and validates the impulse approximation method at this energy.

Findings

Good agreement between measurements and impulse approximation

Method proves effective for extracting neutron-proton amplitudes

Potential for extending measurements to higher energies

Abstract

The differential cross section and deuteron analysing powers of the dp -> {pp}n charge-exchange reaction have been measured with the ANKE spectrometer at the COSY storage ring. Using a deuteron beam of energy 1170 MeV, data were obtained for small momentum transfers to a {pp} system with low excitation energy. A good quantitative understanding of all the measured observables is provided by the impulse approximation using known neutron-proton amplitudes. The proof of principle achieved here for the method suggests that measurements at higher energies will provide useful information in regions where the existing np database is far less reliable.