Complete set of polarization transfer coefficients for the ${}^{3}{\rm He}(p,n)$ reaction at 346 MeV and 0 degrees

TL;DR

This paper presents comprehensive measurements of polarization transfer coefficients for the ${}^{3}{ m He}(p,n)$ reaction at 346 MeV and 0 degrees, revealing discrepancies likely due to a three-proton resonance with specific spin-parity.

Contribution

First complete set of polarization transfer data for this reaction at high energy, identifying a possible three-proton resonance affecting polarization transfer.

Findings

Discrepancy in $D_{LL}(0^{ ightarrow})$ suggests resonance effects.

Resonance estimated to have spin-parity $1/2^-$.

Results align with previous findings at lower energy.

Abstract

We report measurements of the cross-section and a complete set of polarization transfer coefficients for the ${}^{3}{\rm He}(p,n)$ reaction at a bombarding energy $T_p$ = 346 MeV and a reaction angle $\theta_{\rm lab}$ = $0^{\circ}$. The data are compared with the corresponding free nucleon-nucleon values on the basis of the predominance of quasi-elastic scattering processes. Significant discrepancies have been observed in the polarization transfer $D_{LL}(0^{\circ})$, which are presumably the result of the three-proton $T$ = 3/2 resonance. The spin--parity of the resonance is estimated to be $1/2^-$, and the distribution is consistent with previous results obtained for the same reaction at $T_p$ = 48.8 MeV.