Transverse-polarization-transfer coefficients DNN for the (p, n) reaction at θ = 0° have been measured on 12C, 13C and 40Ca targets at Ep = 80 MeV and the 12C and 13C targets at Ep = 50 MeV. As for the 12C and 13C(p, n) reactions, DNN for the transitions corresponding to the Gamow-Teller type and the Fermi and Gamow-Teller mixed type are compared to distorted-wave Born-approximation calculations. Observed DNN values are reproduced reasonably well by the calculations employing either the effective interactions M3Y or the M3Ym in which VTτ and Vστ are modified. A value for R2 = [σGT(0°)/σF(0°)][B(F)/B(GT)] is deduced by using only the DNN data from the 13C(p, n) reaction, and is roughly consistent with R = 1 55Ep, empirically determined from the cross-section data at 0°. As for the 40Ca(p, n) reaction, the observed value for the giant-dipole-resonance region is DNN = 0.23±0.05, indicating that the spinflip and non-spinflip resonances are unresolved. Utilizing information from higher-energy DNN data, the transition-strength ratio f of non-spinflip to spinflip and DNN(SF) pertinent to spinfli[ transitions have been deduced empirically for the giant-dipole-resonance region. Obtained f and DNN(SF) values are 1.4±0.4 and -0.25±0.10, respectively, and are roughly consistent with the RPA calculations.
- Nuclear Reactions
ASJC Scopus subject areas
- Nuclear and High Energy Physics