Time reversal and charge symmetry studies in single nucleon transfer reactions in the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>A</mi><mo>=</mo><mn>5</mn><mn></mn></math></span> system

A. L. Sagle; F. P. Brady; J. L. Romero; B. E. Bonner; N. S. P. King; M. W. McNaughton; H. E. Conzett

doi:10.1103/PhysRevC.25.1685

Rapid Communication

Time reversal and charge symmetry studies in single nucleon transfer reactions in the $A = 5$ system

A. L. Sagle, F. P. Brady, J. L. Romero, B. E. Bonner, N. S. P. King, M. W. McNaughton, and H. E. Conzett

Phys. Rev. C 25, 1685(R) – Published 1 March 1982

Abstract

Time-reversal invariance and charge symmetry have been studied in polarization measurements of single-nucleon transfer reactions in the mass five system. First, we experimentally established the equality of the proton analyzing power, $A$ , for ${}^{4}{He}$ ( $\vec{p}$ , $d$ ) ${}^{3}{He}$ at 32 MeV and the polarization, $P$ , of the inverse reaction, thereby checking time-reversal invariance. Then in a double scattering experiment using the reactions ${}^{3}H$ ( $d$ , $\vec{n}$ ) ${}^{4}{He}$ and ${}^{4}{He}$ ( $\vec{n}$ , $d$ ) ${}^{3}H$ at $θ_{c . m .} = 38.6 °$ and assuming $P = A$ (from time-reversal invariance) we obtained a polarization of 0.480 ± 0.016 for the 50 MeV neutrons. When this value is used, good agreement is found between the analyzing power distributions of ${}^{4}{He}$ ( $\vec{n}$ , $d$ ) ${}^{3}H$ and ${}^{4}{He}$ ( $\vec{p}$ , $d$ ) ${}^{3}{He}$ at 50 MeV, which is consistent with charge symmetry.

NUCLEAR REACTIONS ${}^{4}{He}$ ( $\vec{p}$ , $d$ ) ${}^{3}{He}$ , $E_{p} = 32 and 50$ MeV; ${}^{4}{He}$ ( $\vec{n}$ , $d$ ) ${}^{3}H$ , $E_{n} = 50$ MeV. Measured $A_{ν} (θ)$ , $θ = 25 ° - 150 °$ c.m. Inferred neutron polarization for reaction ${}^{3}H$ ( $d$ , $\vec{n}$ ) ${}^{4}{He}$ at $E_{d} = 37.1$ MeV, $θ = 38.6 °$ c.m.