Gamow-Teller strength in the continuum and quenching problem

Differential cross sections at theta(lab) = 0.0 degrees - 12.3 degrees and a complete set of polarization transfer observables at theta(lab) = 0.0 degrees are measured for the Zr-90(p, n) reaction at T-p = 295 MeV. A multipole decomposition analysis (MDA) technique is applied to the cross sections to deduce the Gamow-Teller (GT) strength B(GT). The obtained S-beta- = Sigma B(GT) value is 28.0 +/- 1.6. The total spin transfer E is obtained for the continuum by using polarization transfer measurements. The S beta(-) - S beta+ value is deduced to be 27.0 and this is 90% of Ikeda's sum rule value of 3(N - Z)=30. Thus the quenching of the GT strength is small and the quenching mechanism due to the Delta N- admixture seems to play a minor role.