Measurement of 3He analyzing power for p-3He scattering using the polarized 3He target

TL;DR

This study measures the analyzing power in p-3He elastic scattering at 70 and 100 MeV using a polarized 3He target, revealing significant discrepancies with theoretical models, especially at certain angles.

Contribution

First measurement of 3He analyzing power in p-3He scattering at these energies, highlighting gaps in current theoretical understanding of three-nucleon forces.

Findings

Large discrepancies between data and predictions at specific angles.

Discrepancies persist even when including Delta-isobar degrees of freedom.

Results suggest need for improved theoretical models.

Abstract

Proton-3He scattering is one of the good probes to study the T=3/2 channel of three--nucleon forces. We have measured 3He analyzing powers for p-3He elastic scattering with the polarized 3He target at 70 and 100 MeV. The data are compared with the theoretical predictions based on the modern nucleon--nucleon potentials. Large discrepancies are found between the data and the calculations at the angles where the 3He analyzing power takes the minimum and maximum values, which are not explained by taking into account Delta-isobar degrees of freedom.